Lights: 600s, Gain 150, -20 (around 15 h total)

20 Darks

Dithering

Equipment:

- HEQ5 Pro

- Radian Raptor 61 (274mm focal length)

- ASI2600MC Pro

- Svbony 60mm

- ASI290MM mini

- ASIAIR Plus

- Filter L-Pro Optolong

Edit: Pixinsight (Drizzled Int.), Photoshop, Lightroom

The Rosette Nebula is a vast emission nebula located about 5,200 light years away. The star forming region lies near a large molecular cloud in the constellation Monoceros, the Unicorn. It is closely associated with the young open star cluster NGC 2244.

NGC 2244 appears in the centre of the Rosette. The hot young stars of the cluster were formed from the nebula’s material in the last 5 million years.

I love this Nebula, it's one of my favourite targets. I have imaged it before with the Redcat 51 and the FLT91, but this is a close up of the Rosette Nebula taken with the William Optics FLT132 and F68III 1.0x flatter (at 910mm focal length and f6.9) over 3 nights. Clouds and a bright moon got in the way, but I managed to get over 8 hours integration time over the 3 separate days. For this image, I used the 3nm dual-band (Ha, Oiii) Optolong L-Ultimate 2" filter with the ASI2600MC Pro camera. Pre and post-processed in PixInsight and Affinity Photo 2.

I love the extra details of the nebula compared with the previous images with the RC51 and FLT91. I will upload two versions, one in HOO (this one) and another in simulated SHO (flic.kr/p/2puRpcs). I hope you like it.

More details in astrobin: astrob.in/2zwu6g/B/

Thanks for looking and Clear Skies!!!

57 x 3min. subs. RGB

Askar FRA400 with Optolong L-eNhance filter

Altair Hypercam 533CPRO (Offset: 50 / Gain: 200 / HCG: On / Bin: 1x1 / -10degC.)

Processed in Affinity Photo

Total of 9.1 hours split between 300s and 60s Narrowband images.

Integration Times:

300s x 40 OIII

300s x 47 Ha

60s x 38 OIII

60s x 72 Ha

Equipment:

Imaging Camera: ASI183MM Pro

Imaging Scope: Zenithstar 61

Guide Camera: ASI120mm Mini

Guide Scope: ZWO 30mm F4

Mount: EQ6-R Pro

Filter Wheel: ZWO 8 Position EFW

Focuser: ZWO EAF

Filters: Optolong Ha and OIII Filters

Astrobin: www.astrobin.com/full/r1cmeb/

Instagram: www.instagram.com/astrobrian_/

Sadr (Gamma Cygni) is the center star of the Northern Cross and is about 1,800 ly from earth. Its solar mass is 12.11 times that of the Sun, so it is destined to be a supernova someday. The nebulosity and dust clouds that appear to surround it are about 4,900 ly away, so they do not interact with Sadr.

This image shows 5 hours of integrated exposure time, shot at the hydrogen-alpha wavelength. The many thousands of other stars in the original image have been digitally removed to allow this cosmic Rorschach test to be seen in greater detail.

Rio Rancho NM Bortle 5 zone, June 28, 2022

William Optics Redcat 51

ZWO 183mm pro

ZWO 30mm f/4 mini guide scope and ZWO 120 Mini

Optolong h-alpha filter

ZWO ASI Air Pro

Sky-Watcher HEQ5

60 X 300s lights with darks bias dithering

Gain 111 at -10C

Processed in DSS, PS, and StarXTerminator

Taken with ZWO ASI2600MC Pro, William Optics FLT 91 with 0.8x reducer/flattener, Optolong L’Ultimate & L'Enhance filters on a ZWO AM5 mount with ASIAir Plus

More acquisition details here: astrob.in/so0tap/E/

NGC2170 dans la constellation de la licorne.

226 poses de 300s avec le filtre optolong Lpro

asi 2600mc pro

asiair pro

Askar FMA 230

ioptron GEM28

siril, pixinsight,photoshop.

ciel Bortle 6/7

traitement pas facile du tout.😓

A sight of wonder since prehistory. In this HDR image I try to be true to the shape of the Orion nebula as seen in a small telescope. Taken from my driveway in Austin, Texas on 2020-11-17 09:20 UT. William Optics RedCat 250/51 mm telescope with a ZWO ASI533 MC Pro camera using an Optolong L-Pro light pollution filter.

Total exposure 104' with 10", 30", and 60" sub-exposures, f/4.9 at a gain of 101.

Orion is sinking into the west in the early evening now. I took the opportunity to capture a HDR version of the Sword of Orion with M42. Taken from Terlingua, Texas, at 2021-03-27 04:16 UT. William Optics RedCat 250/51 mm telescope, Optolong L-eNhance NB filter with Ha and Oiii, ZWO ASI 533MC camera cooled to -10C. 25 60" exposures and 40 120" exposures for 105' of total exposure.

Stacking and HDR composition in PixInsight. Noise reduction in Topaz DeNoise. Final crop and exposure in Photoshop.

Messier 45. Old Friend. New Effort. Zenithstar 81

Note: I intentionally did not stretch the image as much as I could because I wanted to contrast the color of the stars in a black background to the blue nebulosity and enhance detail. Also, follow the straight blue swoop in the center-right part of M45 toward the right border of the image ... Zoom in ... Can you find the little, very distant edge-on galaxy?

----------------------------

Messier 45

The Pleiades, also known as the Seven Sisters and Messier 45, are an open star cluster containing middle-aged, hot B-type stars in the north-west of the constellation Taurus. It is among the star clusters nearest to Earth, it is the nearest Messier object to Earth, and is the cluster most obvious to the naked eye in the night sky.

The cluster is dominated by hot blue and luminous stars that have formed within the last 100 million years. Reflection nebulae around the brightest stars were once thought to be left over material from the formation of the cluster, but are now considered likely to be an unrelated dust cloud in the interstellar medium through which the stars are currently passing. (Wikipedia.org)

Telescope: William Optics Zenithstar 81 Refractor

Mount: iOptron CEM25P

Imaging Camera: ZWO ASI294MC. Gain 120. Cooled to -5C.

Filter: Optolong L-Pro

Guiding: William Optics 50mm, 200mm FL, ASI290MC camera

Guiding Software: PHD2 Software

Site: Borrego Springs, CA USA, Bortle 4

Exposures: 60 x 120s Bin 1x1

Capture Software: APT

Processing: Pixinsight with Final Touchup in Photoshop CC

Polar Align: SharpCap

ZWO ASI1600MM

Filtros: Optolong 12nm

Orion 80ed + RF 0.85x

Orion Shortube + Orion Starshoot Autoguider

Celestron CGEM

Ha: 17x480s

OIII: 10x600s

SII: 5x600s

Bin: 1x1

-20°C

Pixinsight 1.8 + Lr5

06-07-2019

Also in frame, IC5070.

Lens: Canon EF 100mm f/2.8L Macro IS USM

Imaging: ASI183MM Pro, w/ASI120-MM-S (Guiding - QHY MGS)

Mount: Az-GTi

Filters: Optolong Ha, Siii

Sequencing: ASIAIR

Integration: 14 x 120s (Ha), 11x120s (Siii) @ 0deg C, Gain 111 (Unity)

PP: Pixinsight, GIMP 2.0

Drizzle Enabled

PI Narrowband workflow routine:

Phase 1 - QC and LRGB image generation.

Blink, Image Calibration (Superbias, Master Dark & Light Frames), Star Alignment (Pre-Integration), Image Integration, LRGB Combination

Phase 2 - Image enhancement I

Dynamic Crop, Dynamic Background Extraction, Color Calibration, Screen Transfer Function, Histogram Transformation, Curves Transformation

Phase 3 (Optional) - Image enhancement II

Multiscale Linear Transform (Noise),

TGVDeNoise

Optional - DynamicPSF, Deconvolution

PS: Missed on dark calibration frames

Copyright and personal information:

My name: Cornelis van Zuilen

My instagram: www.instagram.com/cvz_astrophotography/

Heiloo, The Netherlands

Equipment used:

Telescope: Askar 103APO

Main camera: ZWO ASI294MC Pro

Filters: Optolong L-Pro

Guidescope: SvBony Sv106 50mm

Guide camera: ZWO ASI224MC

Mount: Skywatcher EQ6-R Pro

Exposures:

Optolong L-Pro

3hr 57min

79x 300sec

Calibration frames for each stack:

20 Darks

20 Flats

20 Dark flats

Processed in Pixinsight

Extra information:

This is the close up version of my last post

Number SH2-260 in the Sharpless catalog, this is a rather faint emission nebula in Orion. I blended 25 hours of Ha data with an RGB image of 5 hours per channel. The camera was an ASI294MM mono camera on a William Optics Zenithstar 103 telescope with Antlia (Ha) and Optolong (RGB) filters.

The Cone Nebula and Christmas Tree Cluster (Cropped from wider photo)

Taken in between clouds with William Optics FLT91/0.8x reducer, ZWO ASI2600MC Pro, Optolong L-Enhance and L-Ultimate 2" filters. Post processed with PixInsight in HOO, Affinity Photo 2, StarXTerminator and NoiseXTerminator.

More details: astrob.in/3urdn6/B/

The Lion Nebula, or Sh2-132 has an extended emission nebula visible in the constellation of Cepheus. My picture captures the mane and body but not the tail. That will be another day. It is located on the southern edge of Cepheus, at a distance of almost 10,400 light years.

Technical Info:

Optics: SGO 6" f/4 Imaging Newtonian @ 610mm FL

Explore Scientific 2" HR Coma Corrector

Camera: ZWO ASI533MC Pro

Filter: 2" Optolong L-Enhance

Mount: Losmandy GM8

Guiding: QHY Mini Guide Scope + PHD2 Software

Acquisition: Sequence Generator Pro

Exposure: Light (Gain 300) - 55 exposures @ 240 Seconds (220 Minutes)

Calibration: 50 Bias, 30 Darks, 50 Flats

​Processing: Deep Sky Stacker, Adobe Photoshop, Topaz Denoise AI, Astronomy Action Set plug in for PS, Astro Flat Pro plug in for PS

Copyright and personal information:

My name: Cornelis van Zuilen

My instagram: www.instagram.com/cvz_astrophotography/

Heiloo, The Netherlands

Equipment used:

Telescope: Askar 103APO

Main camera: ZWO ASI294MC Pro

Filters: Optolong L-Pro

Guidescope: SvBony Sv106 50mm

Guide camera: ZWO ASI224MC

Mount: Skywatcher EQ6-R Pro

Exposures:

Optolong L-eNhance

3hr 57min

79x 300sec

Calibration frames for each stack:

20 Darks

20 Flats

20 Dark flats

Processed in Pixinsight

Extra information:

I made this image with my own equipment from my balcony here in The Netherlands

This is the annotated version of my other post

From my Bortle 6 backyard.

- ZenithStar Z73

- ZWO asi533MC Pro

- SkyWatcher HEQ-5 Pro

- Optolong L-Extreme

23 x 240s

Wide field around M8 M20 and Sh 34

CCD Moravian G2 8300 - 135mm Samyang lens f/2 @f/3.5

Mount: AP GTO1200

Frames: RGB: 4X600 sec. each - H Alpha 7nm 14X600 sec. Bin1 -20°

Filters: 31mm unmounted Optolong

Autoguider: ZWO ASI290MM mini on ZWO 30 F/4, Phd guiding

Processing: Pixinsight, Photoshop

The Jellyfish nebula is a supernova remnant about 5000 light years distant and about 70 light years across.

This is an RGB image captured on a QHY163M mono camera with Optolong RGB filters. The scope used was a WO FLT110 with a Flat4 and the mount was a Skywatcher AZ EQ6-GT. Image sequencing was controlled by Sequence Generator Pro with PHD2 and a LakesideAstro focus motor enabled autofocus. Just over 4 hours of data in each channel in 2 minute frames with gain set to 70. All post-processing was done in PixInsight.

Captured from Prachinburi, Thailand

24 x 5 minutes exposure using ASI294MC camera, 150mm Espirit refractor with 0.75x reducer and Optolong L-Pro filter.

An open star cluster also called the Foxhead cluster, though like most of these names, I don't see it. Quite a number of red giant stars hide in this cluster.

NGC 6819 lies 7,200 light years from us in the constellation of Cygnus the Swan.

Boring techie bit:

Skywatcher Quattro 8" Newtonian Reflector steel tube with the f4 aplanatic coma corrector, Skywatcher EQ6 R pro mount, Altair Starwave 50mm guide scope, ZWO asi120mm guide camera mini, ZWO asi533mc pro cooled to -20c gain 101, Optolong L'enhance 2" filter, ZWO filter drawer, ZWO asiair plus.

60s exposures.

Best 80% of 120 light frames.

Darks, Flats & Bias.

Stacked with DeepSkyStacker and processed in StarTools & Affinity Photo.

This is the seldom imaged "Face of Orion". There are not many images of SH2-264, only wide fields showing the red Ha or some detailed images of meissa only showing stars. Not knowing what to expect i started this 15+ hr exposure and found these blue reflection nebula around the stars of the Collinder 69 cluster. We can see right through that blue nebulosity, just below Meissa we can see the Galaxy PGC143047 with a surface brightness of 24.3 magnitude/arcsec2 at 348 million lightyears.

Image dates: 24,25,26,27 and 28 december 2016 with Esprit 100mm f5.5 APO/ Canon 6Da/ Optolong L on 10 Micron GM2000 HPS II mount.

231x240sec iso1600 (15hr30m) stacked in DSS with 27 Dark frames, 34 Flatframes, and 150 Bias frames. Processed in Pixinsight using only basic steps (DBE with 3 points, backgroundneutralisation, colorcalibration, histogramtransfer and curves adjustments.)

Knight Observatory, Tomar.

Dans la nuit du 28 au 29 juillet avec 34x300 sec, une seance ecourté suite à la rupture du support de l'EAF qui était en impression 3D et visiblement beaucoup trop fine ( 2 mm ), après en avoir dessiné et imprimer un autre ( avec du coup 5 mm d'epaisseur ), j'ai remis ça dans la nuit du 29 au 30, 57x300 sec 😃

Camera Asi 071

Filtre Optolong L-Ultimate

ASkar FMA230

Guidage: OAG Askar et ASI 174 Mini

Monture EM-200 Temma-2Z

51 DOF

91x300 ( 7h35 )

The bright Blue Stars in Cluster NGC2244 excite The Blue Oxygen and Red Hydrogen Emission nebulae of NGC2237. Combined images/exposures: Canon 5Dmk2 (30x60sec iso1600) + Canon 6Da (40x60sec+40x240sec iso1600 (3hr50m total), Esprit 100 f5.5 refractor with Optolong L (IR/UV cut) filter. Stacked with DSS and Combined in Pixinsight (HDRCombination/ Pixelmath)

Knight Observatory Tomar.

M 97 La nébuleuse de la Chouette à 2026 al. et M 108 La galaxie de la Planche de surf à 46 M.al. si proches à première vue mais si distantes l'une de l'autre.

Sky-watcher T250/1000 Newton F4

ZWO ASI294 MC-Cool à -10°C

AZ-EQ6 Pro Goto USB

Guidage : TS 80/328 F4,1 + ZWO ASI120 mini

Acquisition : ASIAIR+

traitement : PIXSINSIGHT

Optolong L-pro

GPU coma-correcteur Sky-watcher

19 Mars 2025

20x300" + 15 Darks + 15 Flats - Gain 120

Intégration: 1 h 40

Redcat 51 zwo asi183mc pro optolong l-extreme filter 10 x 300s 122 gain. Flats, bias and darks. Processed in APP then pixinsight and photoshop. 23rd Dec 2020

My original full scale image shows 1138 PGC Galaxies. The annotated image is unreadable because of all the overlapping identification codes. Esprit 100 f5.5 refractor with Optolong L filer and Canon 6Da. 51x300 seconds iso1600 (4hrs 15 minutes), 24 flats, 174 bias frames. (DSS+PI)

Knight Observatory Tomar

NGC 1788 è una nebulosa diffusa osservabile nella costellazione di Orione. Si individua circa 2 gradi a nord della stella β Eridani, nella parte occidentale della costellazione; ha delle dimensioni relativamente ridotte e può essere osservata con un potente telescopio o nelle foto a lunga posa. La nebulosa riflette la luce delle stelle vicine, in particolare di un astro di decima magnitudine, situata nel settore nordoccidentale della nebulosa. Verso sud, NGC 1788 è attraversata da una banda oscura, nota come LDN 1616; la distanza del complesso nebuloso è stimata sui 1470 anni luce da noi. Ripresa in due serate , una con luna al 50% prossimo anno si integra light da 300" tot. 6h filtro Optolong L-Quad Enhance 2" tele SW Evostar 72 ed ridotto 0.8x Cam Qhy294c pro , guida phd2 mon. Eq6r pro software di acquisizione N.I.N.A. stacking DSS , elab. PixInsight + Photoshop

One hour of integration-two minute subs-Bortle 6 location-moonless night

Redcat51/ZWO183MC/Optolong UV/IR filter/ASIAIR/HEQ5

Stacked in APP/processed in PixinSight/minor touches in Photoshop CS6

Processing steps in PI

Dynamic Crop

Background extraction-GraXpert

Image solver

SPCC

BlurX-Correct

BlurX Default

Noise X

GHS

HDR-layer 4

GHS

Starnet++

1. Star layer

SCNR-twice-once on inverted image -if there are halos on bright stars

Invert back after SCNR

Process>StarMask>Create Mask

Apply to image

Curves-increase saturation

Delete mask

2 Starless

SCNR

Range Mask

Increase Saturation

Remove mask

Adjust blackpoint in GHS tool

3 Combine using PixelMath

~((~stars)*(~starless))

4 slight boost to vibrance in Photoshop

Whirlpool Galaxy (M51)

Shot 27/28-April 2023

Distance: 23.1 Million LY

Shot 70 exposures x 5 minutes with Optolong L-Pro Filter

Gain 100, camera cooled to -10°C

Stacked best 64 (90%) frames in Astro Pixel Processor for a total integration time of 5 hours, 20 minutes

Calibration frames: Darks, Flats, Bias, Bad Pixel Map

Main Camera: ZWO ASI2600 MC Pro

Filter: Optolong L-Pro

Mount: iOptron CEM40

Controller: ASIAIR Plus

Main scope: Celestron Edge HD 8, no reducer; focal length 2032

Guide Camera: ZWO ASI174mm mini using Celestron Off Axis Guider

Processed on 9 May 2023 on a 2021 M1 Macbook Pro with:

- Astro Pixel Processor for stacking primary processing

- Graxpert for gradient removal

- Pixinsight for primary processing and final BlurXTerminator run

- Photoshop (2023) for masked curves and levels adjustments

- Camera Raw

- Astronomy Tools PS Astro Action Set (Local Contrast Enhancement, Increase star color, Make Stars smaller)

- RC Astro NoiseXTerminator (Pixinsight)

- RC Astro StarXTerminator (Pixinsight)

- RC Astro BlurXTerminator (Pixinsight)

William Oprics RedCat 51 mini

ZWO ASI 2600 MC Pro

Optolong L-Pro

5 hours exposure timle

The APOD awarded image from December 2022, Has been very carefully reprocessed using new techniques to reveal previously hidden Hydrogen emissions and reflection nebula detail.

Technical details are as follows:

Paramount ME

Celestron C14 Edge HD

Starizona Hyperstar 14 V4

Optolong L-Pro Luminance filter

ZWO ASI 6200MC Color Camera

276x120sec exposures

Processed in APP and Lightroom

Aurora HDR

Orion Nebula

William Optics Z61, Flat61

Optolong UV/IR Cut Filter

ZWO ASI071MC Pro

iOptron SkyGuider Pro

Light 74x90s

Dark 30

Bias 100

Flat 20

KStars and PixInsight

Head of the Pelican Nebula or IC5070

Skywatcher 200p on NEQ6 mount, with guiding and dithering.

Optolong CLS-CCD filter. ASI294MC Pro at -20C. 60 x 60 second exposures at Gain 121, Offset 30 , 20 dark frames, 30 flat fields, 30 dark flat frames.

The wind was quite strong.

"Comet Giacobini–Zinner is a periodic comet in the Solar System. Discovered by Michael Giacobini in December 1900 at the Nice observatory, the comet is quite small with a diameter of just 1.24 miles (2 km)." Wikipedia

Equipment:

MYT mount

AT65EDQ Telescope

Canon 6D Modded Camera

Optolong LP-Pro filter

PI process

Midland TX (My Backyard)

ISO1600

EXP 60 sec x 120

2 hours integration time

Date of image 9-11-2018

Primera prueba y resultado de 2 horas y 24 min de integración fotográfica, con una humedad relativa 99% y temperatura 6.3°C . (Además con algo de viento) Esto es una prueba de capacidad del filtro en luna creciente 10.9% iluminada.

Tomas individuales de larga exposición de 360 seg. a ISO 1600 y utillizando filtro L- extreme ; realizadas en sector cerro Roa, Octava región, Chile. (Bortle 4-5).

Se ha utilizado telescopio refractor TS 65mm apertura y 420mm df cuádruple, dew heater ,montura CEM 40 y cámara reflex canon T6i , Filtro Optolong L- extreme. (Alimentado a través de Pegasus Dslr nueva adquisición) Apilado y procesado por PixInsight.

Fotografías realizadas el 01 de Agosto 2022. Sin dithering.

Se esta analizando dejar de trabajar con Cámara Canon T6i para empezar a obtener resultados con Camara dedicada comprado hace pocos meses QHY 183C .

Magnitud:

La Nebulosa Pata de Gato (NGC 6334) es una amplia zona de formación estelar. NGC 6334 está a unos 5.500 años-luz de distancia de la Tierra en la constelación de Scorpius. La nube de gas completa tiene cerca de 50 años-luz de extensión.

NGC 6334 es una de las zonas de formación de estrellas masivas más activas de nuestra galaxia y ha sido extensamente estudiada por los astrónomos. La nebulosa oculta estrellas azules brillantes recién nacidas, cada una con una masa equivalente a unas diez veces la de nuestro Sol, surgidas en los últimos millones de años. La zona es también hogar de varias estrellas recién nacidas enterradas profundamente en el polvo, por lo que se hace difícil estudiarlas. En total, la Nebulosa Pata de Gato puede contener varias decenas de miles de estrellas.

La nebulosa aparece de color rojo pues su luz azul y verde es dispersada y absorbida más eficientemente por el material que existe entre la nebulosa y la Tierra. La luz roja proviene predominantemente de gas hidrógeno incandescente bajo el intenso resplandor de estrellas jóvenes y calientes. (ESO)

Magnitud: 7.1

La nebulosa de la Mariposa o NGC 6302 es una nebulosa planetaria bipolar situada en la constelación de Scorpius. Se la conoce también como la nebulosa del Insecto o de los Gemelos, y fue estudiada por primera vez en 1907 por el astrónomo estadounidense Edward Emerson Barnard, quien la dibujó y la describió. (Wikipedia)

NGC4319 is about 77 Million light years where as Markarian 205 is around 1 billion light years. en.wikipedia.org/wiki/NGC_4319

April 14th 2023

Celestron RASA 8"

ZWO183mc pro

ZWO EAF

Optolong l-Pro

ZWO air pro

Sky-Watcher HEQ5 Pro

22 mins Lights Flats , Darks and Bias.

Gain 122 at -10C

Processed in Pixinsight

April 6th 2021

Williams Optics Redcat 51

ZWO183mmc pro

Optolong l-pro filter

ZWO air pro

Sky-Watcher HEQ5 Pro

15x300s Lights. Flats , Darks and Bias.

Gain 122 at -10C

Processed in APP and Pixinsight

A galaxy in the constellation of Draco.

A barred spiral galaxy that is quite a difficult target because of it's low surface brightness.

11.7 million light years away this galaxy was first spotted by William Herschel in April of 1793.

Boring techie bit:

Skywatcher Quattro 8" Newtonian Reflector steel tube with the f4 aplanatic coma corrector, Skywatcher EQ6 R pro mount, Altair Starwave 50mm guide scope, ZWO asi120mm guide camera mini, ZWO asi533mc pro cooled to -10c, Optolong L'enhance 2" filter, ZWO asiair plus.

300 seconds at 0 gain.

Stacked with DeepSkyStacker and processed in StarTools & Affinity Photo.

2 panel mosaic through 2 nights. Around 9 hours of data for each panel.

Lights: 203x300''

Darks: 15x300''

Bias: 60

Skywatcher APO 72ED (0,85x)

HEQ5

ZWO ASI533MC Pro

ZWO 120MM Mini + ZWO Guide Scope Mini

Optolong L-eXtreme 2"

Asiair Plus

Stacked & Processed in PixInsight.

NGC 4565 - Needle/Flying Saucer

Luminance: Sky-Watcher Esprit 150 f/7

QHY 600-A w/ Optolong UV/IR filter- 58 x 600s

Chrominance: Takahashi FSQ-106 ED IV @ f/5

QHY367C with Optolong L-Pro filter- 244 x 180s

Object description at www.billionsandbillions.com

and astrodoc.ca/ngc-4565/

Taken with a one shot colour camera from Bortle 7 skies in Sydney Australia.

The image consists of 90 x 4 minute exposures that were stacked on the fly using SharpCap software, 90mm lens, ASI294MC camera, Optolong LP-Pro filter and Losmandy G11 GT mount.

So whilst the camera was left open for 6 hours, the stack is effectively only 4 minutes but with so many sub exposures it is virtually noise free. The mount was unguided during that time and any small deviations from each 4 minute sub exposure were managed by a slight repositioning of stars in the SharpCap software.

M45

Stellarvue SV-125 Access

Nikon D800 Full Spectrum

Optolong UV/IR Cut

15x720" ISO200

16x480" ISO200

Stacked in DSS, processed in PS

NGC 281 is an emission nebula in the constellation Cassiopeea. surrounds the open cluster IC 1590. It is sometimes called the Pacman Nebula.

It is located 1.5 degrees east of the α Cassiopeiae; powerful instruments are needed to detect the nebula, which is certainly the most important object, since the cluster associated with it is formed by a few stars and dominated by a double star of eighth magnitude. The nebula appears sharply furrowed by a dark vein, which crosses it east-west; perpendicular to this one another is identified, facing south: thus a "T" is formed that deeply marks the whole object.

Shooting data:camera canon eos 1100d fullspectrum,canon lens 75/300 to 200mm f 7/1 - iso 1600 - 13x90s - optolong filter l-pro eos a clip - apt capture - use of lx2 minitrack astroinseguitor - sum with sequator and photoshop processing

www.astrobin.com/327267/B/

Please check www.astrobin.com/327267/0 to find the nine galaxies

Technical card

Imaging telescope or lens: Altair Astro RC250-TT 10" RC Truss Tube

Imaging camera: ZWO ASI1600MM-Cool

Mount: Skywatcher AZ EQ-6 GT

Guiding telescope or lens: Celestron OAG Deluxe

Focal reducer: Astro-Physics CCDT67 - 0.67x Reducer

Software: Main Sequence Software Seqence Generator Pro, Pleiades Astrophoto PixInsight

Filters: Optolong OIII 6.5nm 36mm, Optolong Ha 7nm 36mm

Accessories: MoonLite CSL 2.5" Focuser with High Res Stepper Motor, ZWO EFW

Resolution: 3212x2584

Dates: Dec. 16, 2017, Dec. 17, 2017

Frames:

Optolong Ha 7nm 36mm: 38x300" (gain: 139.00) -20C bin 1x1

Optolong Ha 7nm 36mm: 8x600" (gain: 200.00) -20C bin 1x1

Optolong OIII 6.5nm 36mm: 52x300" (gain: 132.00) -20C bin 1x1

Optolong OIII 6.5nm 36mm: 6x600" (gain: 200.00) -20C bin 1x1

Integration: 9.8 hours

Avg. Moon age: 28.38 days

Avg. Moon phase: 1.70%

Astrometry.net job: 1870240

RA center: 168.699 degrees

DEC center: 55.016 degrees

Pixel scale: 0.531 arcsec/pixel

Orientation: 94.925 degrees

Field radius: 0.304 degrees

Locations: Berga Resort, Berga, Barcelona, Spain

L'amas de la Chevelure de Bérénice ou amas de Coma (Abell 1656) est un vaste amas de galaxies qui contient plus de 1000 galaxies identifiées.

La distance moyenne de l'amas à la Terre est d'environ 99 Mpc (∼323 millions d'al). La plus éloignée visible repèrée NGC 4854 à 479 millions d'al.

Sky-watcher T250/1000 Newton F4

ZWO ASI294 MC-Cool à -10°C

AZ-EQ6 Pro Goto USB

Guidage : TS 80/328 F4,1 + ZWO ASI120 mini

Acquisition : ASIAIR+

traitement : PIXSINSIGHT

Optolong L-pro

GPU coma-correcteur Sky-watcher

04 Avril 2025

12x300" + 50 Darks + 50 Flats - Gain 120

Intégration: 1 h

Brocchi's Cluster (also known as Collinder 399, Cr 399 or Al Sufi's Cluster) is a random grouping of stars located in the constellation Vulpecula near the border with Sagitta. The members of the star cluster form an asterism which has given rise to its name as the Coathanger.

Several independent studies since 1998 have now determined that this object is not a true cluster at all, but rather just a chance alignment of stars. (Wikipedia)

October 6th 2022

Williams Optics Redcat 51

ZWO183mc pro

ZWO EAF

Optolong l-extreme filter

ZWO air pro

Sky-Watcher HEQ5 Pro

10*60s Lights. Flats , Darks and Bias.

Gain 122 at -10C

Processed in Pixinsight

IC 1848 is the catalog designation for the Soul Nebula, a large emission nebula and active star-forming region in the constellation Cassiopeia. The designation IC 1848 technically refers to one of the open star clusters embedded within the nebula but is commonly used to refer to the entire nebula complex.

Image acquisition:_________________

105 Light Frames

40 Dark Frames

40 Flat Frames

40 Offset/Bias Frames

Exposures 300-Sec

ISO-1600

Equipment:_________________

ZWO ASIAir Plus

Telescope: ES ED102CF FCD-100 F7-714mm

Mount: ZWO AM5

Orion .8x focal reducer

Camera: Nikon D7000 Stock

Optolong L-Enhance Dual Narrowband Filter

Auto Guiding:___________________

ASIAir PHD guiding

Camera: ZWO ASI178MM

Guide Scope: SVBony 60mm x 240mm

Post

Processing:______________________

Siril V-1.4.0_beta4

Graxpert BGE V-3.0.2

CosmicClarity Denoise V-6.5

GIMP V-2.10.36

Total Exposure Time: 8Hrs. 45mins.

I tried mixture of frames taken with and without dual narrow filter, though there were poor hydrogen-alpha and Oiii emissions except Sh2-174 in the field. The field was including Polaris. Frames rotated in imaging with autoguiding on, and I made autoguiding off.

equipment: Askar FMA180 Pro and Canon EOS R6-SP5, modified by Seo-san on ZWO AM5 Equatorial mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, ZWO ASI 120MM-mini without autoguiding

exposure: 6 times x 900 seconds, 5 x 240 sec, and 17 x 60 seconds at ISO 1,600 with Canon Clear Filter and 5 times 1,800 seconds with Optolong L-ultimate Dual 3nm Filter at f/4.5

site: 1,770m above sea level at lat. 35 22 22 North and long. 138 41 03 East on the western slope of Mt.Fuji 山梨県 南都留郡 鳴沢村 林道軽水線 終点