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Well wonders will never cease - we got a clear moonless night last night :)
This is Andromeda (well, some if it), and its two satellite galaxies M32 and M110. 2.5 million light years away and on a collision course with our galaxy, so don't worry too much about your pension ;)
This is my first serious attempt at M31, apart from a rather weak effort with the scope when I first started indulging in this masochistic activity. Considering how close it is (relatively speaking), the outer details of this thing are infuriatingly faint. This is 2 hours, so, in my ignorance, I expected a little bit more - the outer lanes would have been nice. We live and learn :)
Nikon D70 modded, 55-200 Nikkor at 200mm (cropped, a lot), f5.6, 800iso, Baader Neodymium filter.
30 x 4 min, unguided EQ5
Darks, flats and bias
Stacked and processed in DSS and CS5, with a little help from Noel's tools.
Reprocessed here.
IC 1396 is a star cluster surrounded by an area of (very faint, I discovered) nebulosity in the constellation Cepheus, about 2,400 light years away. The area contains the Elephant's Trunk Nebula, which you can't see clearly in the above image, but it is in there somewhere! The bright orange star to the left is the red supergiant Mu Cephei (μ Cephei), also known as Herschel's Garnet Star (garnet from the colour), and is one of the biggest and most luminous stars in our galaxy. It is 1650 times larger than our sun, and if placed where our sun is, it's radius would extend between the orbits of Jupiter and Saturn. It's a big fella!
This is the first iteration, and I will no doubt have several goes at this. One of the most difficult I've had to process, for three hours total exposure the noise was horrendous, and the signal weak. I'm sure there's more there, but I was constantly struggling against the noise and the most appalling colour gradients I've ever seen! First time I've managed 5 minute subs unguided, which is a result.
Nikon D70 full spectrum, 55-200 Nikkor at 175mm (cropped), f6.3, 1600iso, Baader Neodymium filter.
20 x 4 min and 20 x 5 min subs for a total of 3 hours (longest I've done so far), unguided EQ5
Darks, flats and bias
Stacked and processed in DSS and CS5, with a little help from Noel's tools.
Second iteration to follow once I've got rid of my headache and got about five hours to kill :)
While Comet Holmes is quite large (about 1° in width) it is much fainter than it was two months ago. However, Comet Tuttle is returning to the inner solar system. It's about magnitude 6 and just visible in dark skies. In light polluted city skies it is just barely visible. With a four 30-second exposures stacked and 7 dark frames subtracted I was able to tease out the faint green of Comet Tuttle.
On December 30 it will make its way toward the constellation Triangulum and come very close to the Triangulum Galaxy.
As I can't leave this stuff alone, thought I'd have another go at processing this, and also put it the right way up, just for fun. I'm missing Orion you see :)
I could be doing more important stuff of course! :)
A couple of galaxy images from the rare clear night on Saturday.
31 x 1-minute exposures, ISO 6400, f/4. Modified EOS 600D & Revelation 12" Newtonian reflector telescope.
Frames registered and stacked in DeepSkyStacker software; curves adjusted in Canon Photo Professional; noise reduction in CyberLink PhotoDirector.
Old data from March this year - given the treatment :) Go away, moon and clouds!
SW 200p/EQ5, Nikon D70 modded iso 1600
48 x 60 second subs unguided
Stacked in DSS, processed in CS5.
Milky way caputred with fisheye lens attached to canon 450d with 10 images of 30 secs each stacked in deepskystacker with default settings.
Orion's Belt and Sword, M42 Orion Nebula (right) and IC434 Horsehead and NGC2024 Flame Nebulae (left) - widefield (approx 8.5deg across) - 15-Dec-2014 Zeiss Sonnar Apo 135/2 lens on Astrotrac TT320X-AG mount - Canon 60Da camera + Hutech IDAS LPR Filter, 33 frames (240sec) + 22 frames (30sec) 135mm @ f/2.0 ISO400 - Total Exp: 2h23m + 20+27 Darks + 29 EL panel flats, stacked with DeepSkyStacker, post-processed with Photoshop CC/Lightroom/Nebulosity 3
Another section of the Milky Way from my back yard. This one includes the constellation Delphinus to the far left, and Brocchi's Cluster (or the Coathanger) upper middle.
18 x 5min @ ISO 800
Stacked with DeepSkyStacker
Canon 350D (modified)
Canon EF 35mm f/1.4L
AstroTrac TT320
M82 (Cigar Galaxy) taken on 18 Sep 13. H-Alpha 1x900s & 6x600s, RGB 6x300s (2x2 binned) darks,bias,flats added. Stacked in DeepSkyStacker & processed in PS2.
Camera: Atik 314L+
Scope: Celestron C8 with 6.3 F/reducer.
Mount: AZ EQ6-GT goto, PhD guided with Orion SSAG through OAG.
OTA: Celestron C10N, 10" newtonian reflector
Starizona Nexus 0.75x coma corrector (for f/3.75)
Camera: ZWO ASI1600MM
Filters: Baader CMOS-Optimized
Exposure: CLS-CCD Lum 98x2min, RGB each 10x2min, Ha 7x10min
Mount: CEM70G
Captured with SGP
Registered and stacked with DeepSkyStacker
Photographed from Round Rock TX (light pollution zone: red)
Date Oct.2014 Iwaki-City Fukushima Japan
ISO1600 360sec. * 10*4MOSAIC (total exposure 240 min.)
Camera : Astronomically customized Canon EOS 6D
Telescope : Takahashi FS60CB with RD0.72
Tracking Mount : Takahashi P-2 with HD-4
Guiding Camera : QHY5L-Ⅱ Mono
Guiding Telescope : COSMICAR 50ｍｍ F1.8
Auto Guide Software : PHD Guiding and others
Softwear：DeepSkyStacker ,Photoshop CS6(CC)
Caught this before sunrise. I wanted to get a wider field of view, but I had to crop because of coma.
Exposure: 7x120s, ISO1250
Camera: Olympus E-PL1
Lens: Auto Reveunon 55mm f/1.4 @f/4
Software: DeepSkyStacker, Krita, Darktable
Localisation : CastresmallObservatory (Castres, Tarn - France)
Acquisition Date : 2016-12-06
Auteur/Author : ROUGÉ Pierre
Mouture/mount : Orion Atlas EQ-G
Tube/Scope : Sigma 80-200 (f 3.5-4) @ 200mm-f4
Autoguiding : Skywatcher Synguider (v1.1) & Meade ETX 70/350 mm
Camera : Canon EOS 400D (Digital Rebel Xti) refiltré Astrodon in Side (modded Astrodon in Side)
+ EOS CLIP CLS Astronomik
Exposure : 90 minutes [30 subexposures of 180 sec each (selected from 30)] @ ISO 800
Calibration : Dark & Bias : 4/11 @ ISO 800 - Flat & Dark-Flat : 9 @ ISO 400
Temps/Weather : Bonne transparence. Vent nul. T=5°C. Humidité faible.
Constellation : Aurigae/Cocher
Software Used : Astro Photograph Tool (v3.20), DeepSkyStacker 3.3.6, Pixinsight LE, PhotoShop 7, xnview, Noiseware Community Edition
my very first astro picture! :) sony a6000, Minolta MD Tele Rokkor 2.8/135 @ f4, 1s@ISO3200 on static tripod, 12 Lightframes, 11 Darkframes, 11 Flatframes stacked in DeepSkyStacker
More deep sky stacking fun. I went out again tonight, and filled up the CF card in the camera with 2 second exposures. the moon wasn't quite up yet, so I think the background sky was a little darker. However, the resulting exposure didn't look significantly better than the one from yesterday.
So I decided to combine all the exposures from yesterday and today to see how that looked.
This works out at a combined exposure of about 12 minutes.
Bubble nebula "true color" narrowband: 21X1200"Ha, 12X1200"Oiii, 12X1200"Sii SVR90T OTA, Atik 428ex, AP900, DeepSkyStacker, Photoshop levels, curves, blending, guided with Orion SSAG and Orion ShortTube guidescope.
Riccardo Rossi / ISAA
23:15 CEST - 18 Lug 2020 - Lama Mocogno (MO)
NIKON D90 + Nikkor 14-24mm f/2.8G ED AF-S
Focale 24mm - Apertura f/2.8 - Posa 30” a 800 ISO
Treppiede motorizzato EQ3
Stacking di 14 scatti con DeepSkyStacker
Telescope: SkyWatcher Black Diamond ED80 + Reducer 0.85x
OTA: SkyWatcher Ηeq5 Pro
Guiding: SkyWatcher 9x50 Finder με ZWO ASI120 MM
CCD: ATIK 414ex
Filter: Baader L
Proccess: DeepSkyStacker 3.3.4, Adobe Photoshop CS6
L : 125x56
Darks : 10
bias : 45
Flats : 45
Dark Flats : 45
Not a bad view, eh? Sitting and looking at the ocean is always a restful, soothing experience for me. Sitting and lThis image of Orion and its surrounds was created using the iOptron SkyTracker and my unmodded Canon EOS 6D plus Canon 40mm STM lens. The photo shows lots of stars and some significant deep-sky features. I expected to be able to photograph M42 (Orion Nebula) and got it but it’s overexposed here. The one feature of this part of the sky that I was wanting to capture was Barnard’s Loop and I’m happy that I achieved that goal. As well as these two wonders I snagged the Witch Head Nebula (very faint), the Running Man Nebula, IC434 & the Horsehead Nebula, plus the Flame Nebula. The Rosette and Lambda Orionis Nebulae, the much smaller and fainter vDB 38 Nebula and the Christmas Tree Cluster are also visible.
I’ve had the tracking mount for about three years but haven’t used it more than a handful of times. Initially I struggled with achieving polar alignment and after my first few attempts the tracker ended up languishing in a cupboard for around eighteen months. Whether it’s the “proper” way or not I’ve found that using some electronic spirit levels and my iPhone’s Compass app I can achieve polar alignment much more reliably than any method I’ve tried previously.
The source images for this composite were as follows:
Lights:x49 framesCanon EOS 6D, Canon 40mm STM f/2.8 lens @ f/3.2, 60 second exp @ ISO 1600
Darks:x5 framesCanon EOS 6D, Canon 40mm STM f/2.8 lens @ f/3.2, 60 second exp @ ISO 1600
Bias:x15 framesCanon EOS 6D, Canon 40mm STM f/2.8 lens @ f/3.2, 1/4000 second exp @ ISO 1600
Stacking was done using Deep Sky Stacker running in the Wineskin wrapper on an iMac. I used the “MiniSTARS” Photoshop action for star reduction photographingspace.com/product/ministars/?utm_source=ps&a... at a starry sky fills me with awe and wonder. This seat on Tarandore Point at Tuross Head, Australia, provides the best of both of these experiences. Access is free and more often than not you’ll be the only person there to take it all in.
The photo was taken with a Canon EOS 6D, a Rokinon 24mm lens @ f/2.4, 13-second exposure @ ISO 6400.
Finally I managed to capture a decent image of M31 and its two satellite galaxies. I really need to try it with 2 minute exposures one day.
Exposure: 47x60s, ISO 800
Camera: Olympus E-PL1
Lens: Konica Hexar 200mm f/4 with external aperture mask
Mount: EQ3-2
Software: DeepSkyStacker, Darktable, Krita
Manually guided for 7 x 7-minute exposures at ISO 1600, f/6.25. Modified EOS 600D & Sky-Watcher ED80 refractor, piggybacked on a Celestron C8 telescope for guiding.
Registered and stacked using DeepSkyStacker; initial curves adjusted in Canon Photo Professional; final curves and colour balance adjusted using Paint Shop Pro; noise reduction via CyberLink PhotoDirector.
Image taken with a Nikon D750 and Zenithstar 61 scope, mounted to the iOptron SkyGuider Pro.
Stacked in DeepSkyStacker, then processed in Photoshop.
57x240sec ISO1600 Skywatcher Esprit 100mm F5.5 Apo triplet with full spectrum modified Canon 6D and Astronomik L (IR/UV cut off) filter. 20Dark frames,20Flat frames,65Bias frames. Stacked in DeepSkyStacker and processed in Pixinsight. Date: 09-aug-2015. Not an easy target.......
C9.25 @ f/10 and SX Trius 694 attached to filter wheel and OAG all riding on an EQ6 Pro. Five subs at 900 seconds each through an H alpha filter during the time of full Moon, stacked in Deepskystacker and processed in PS CS2,darks and flats subtracted.
Taken 26/02/2021
Last of the photos from my Christmas/New Year astronomy sessions.
Manually, off-axis guided for 9 x 4-minute exposures at ISO 1600, f/4.
Modified EOS 600D & Revelation 12" Newtonian reflector telescope.
Registered and stacked using DeepSkyStacker; initial curves adjusted in Canon Photo Professional; final curves & colour-balance adjusted using Paint Shop Pro; noise reduction via CyberLink PhotoDirector.
Taken using Skywatcher 80ED Pro (.85X FR), Nikon D3300, 102x30" lights (ISO 3200), 100 flats, 110 bias. Stacked in DeepSkyStacker and processed in Photoshop
The Eagle Nebula (catalogued as Messier 16 or M16, and as NGC 6611) is a young open cluster of stars in the constellation Serpens. Its name derives from its shape that is thought to resemble an eagle. It contains several active star-forming gas and dust regions, including the famous "Pillars of Creation", photographed by the Hubble Space Telescope.
Optical Rig
MOUNT: Meade LX850 w/ Starlok
SCOPE: Stellarvue SV105-3SV
REDUCER: SFF7-3SV Field Flattener
CAMERA: Canon 550D Full Spectrum Mod by Gary Honis
FILTER: Astronomik L-UV/IR Filter
SOFTWARE: Nebulosity 3
Exposures
19 1-min 1600 ISO @ f3.5 (19min)
11 2-min 1600 ISO @ f3.5 (22min)
5 5-min 800 ISO @ f3.5 (25min)
5 5-min 1600 ISO @ f3.5 (25min)
Total Exposure Time 91 minutes
Image Processing
STACKER: Deep Sky Stacker
RAW EDIT: Adobe Lightroom
Operating System - Windows 8.1 64bit
Shot on the Natchez Trace Parkway at the Meriwether Lewis Monument.
Camera: EM1 Mark II
Lens/Telescope: Prime Focus with Stellarvue 80mm f6 Achromatic Refractor (Nighthawk Classic)
Subs: 10 x 60s, ISO 6400
Darks: 10
Flats: 30
Dark Flats: 30
Bias: 30
Mount: Celestron ASGT EQ (unguided)
Location: Bortle Scale 5
Software: DeepSkySTacker, Lightroom, Photoshop
We had a cloudless night last night, but the transparency was appalling (could only see The Pleiades with averted vision!). But as it was the first clear night in a month, I decided to have a go. Seven frames in and the fog descended with a vengeance, so this is just 7 x 4 minutes. Very pleased with this considering the conditions and small number of subs, and gives me hope for a much better image when the conditions improve. Hopefully then I'll pick up some of the fainter stuff :)
Nikon D70 modded, 55-200 Nikkor at 200mm (full frame), f5.6, 1600iso, Baader Neodymium filter.
7 x 4 min subs for a total of 28 mins, unguided EQ5
Darks, flats and bias
Stacked and processed in DSS and CS5.
This photo was taken from Silchester, Hampshire, UK (51.35 long, 1.06667 lat).on 24 September 2013 between 9.30pm and 10.00pm.
The photo is composed of 20 exposures of 90 seconds at ISO 6400 with four dark frames subtracted and all stacked using deepskystacker.
The California Nebula is an emission nebula located in the constellation Perseus. It is almost 2.5° long in the sky and, because of its very low surface brightness, it is extremely difficult to capture. As a result, I'm quite pleased with this imagine.
My equipment is a modified Canon EOS 1100D, a Sky Watcher ED80 telescope and an EQ3-2 Mount with an RA motor. I also used a UHC filter to help remove some of the light pollution.
orion widefield. taken from the LP capital of the world: oakland, CA.
canon 50d (unmodified) and canon 50mm f/1.2L lens, mounted on an orion sky view pro. astronomik CLS clip-in fliter. polar alignment using orion spotting scope. unguided.
night 1: 1m45s x 62f at ISO640 and f/3.2. 1h48m total.
night 2: 1m45s x 58f at ISO800 and f/5. 1h38m total.
night 1 and night 2 individually stacked in deepskystacker using auto-adaptive weighted average. 20 bias frames and 20 darks each.
then, night 1 final image and night 2 final image stacked together using average mode, for a total of 3h26min.
postprocessing in pixinsight 1.5:
- automatic background extraction to take care of a wicked sky gradient.
- deconvolution
- noise reduction
- 6 separate histogram stretches
then, image fusion of the 6 stretches using enfuse. this step is needed because M42 is so bright that it is completely blown out when the image is stretched enough to bring out barnard's loop.
final tweaks in lightroom 2.0; a little bit of color balancing and contrast adjustments.
lastly another run at noise reduction in noise ninja. if i knew how to use pixinsight better this would probably not be necessary.
notes:
this is kind of weak sauce and likely what you could get in just a few minutes of imaging from a dark site. also i should probably get a camera with the IR cut filter removed...
on night 1 i was anxious to get going since orion only clears the roof of my house about 11:30pm these days. i meant to shoot more to the left to pick up all of barnard's loop, but it was still obscured by my house.
it turns out that either i have a bad copy of this lens, or its just not well suited for astrophotography. even stopped down from its native f/1.2 to f/3.2, there is still a LOT of red CA. i may have been slightly misfocused as well. luckily it's just a rental, as it is a very expensive lens.
so on night 2 i stopped down to f/5, but cranked the ISO. the CA was reduced, but it's still there. i probably should have gone for longer exposures too. the only problem is that there's so much skyglow that i could probably only do 3 minutes tops even at f/5 without overexposing the bottom of the image.
having said all of that i'm sort of amazed to see the slightest bit of witch head goin' on over there.
i'll probably continue to work on this widefield over the coming months.
Orion's Belt and Sword, M42 Orion Nebula (right) and IC434 Horsehead and NGC2024 Flame Nebulae (left) - widefield (approx 8.5deg across) - 15-Dec-2014 Zeiss Sonnar Apo 135/2 lens on Astrotrac TT320X-AG mount - Canon 60Da camera + Hutech IDAS LPR Filter, 33 frames (240sec) + 22 frames (30sec) 135mm @ f/2.0 ISO400 - Total Exp: 2h23m + 20+27 Darks + 29 EL panel flats, stacked with DeepSkyStacker, post-processed with Photoshop CC/Lightroom/Nebulosity 3
4x20s ISO800
1 Flat Dark - 1 Master Dark
Fuji FinePix S1 Pro
Nikkor 28-80mm F3.3-5.6G at 28mm F3.3
Deep Sky Stacker
(Scusate la compressione degradante del JPEG ma però non riuscivo a caricare il RAW)
Imaging telescopes or lenses: Skywatcher Explorer 130 PDS
Imaging cameras: Canon 600 astro-modificated
Mounts: Celestron Advanced VX Goto
Software: Photoshop, DeepSkyStacker, Fitswork
Filters: Astronomik Clip-Filter (EOS) / CLS
Resolution: 2268x1511
Dates: April 19, 2015
Frames: Astronomik Clip-Filter (EOS) / CLS: 110x50" ISO800
Integration: 1.5 hours
Flats: ~25
Avg. Moon age: 0.24 days
Avg. Moon phase: 0.07%
Bortle Dark-Sky Scale: 7.00
Localisation : CastresmallObservatory (Castres, Tarn - France)
Acquisition Date : 2017-01-06
Auteur/Author : ROUGÉ Pierre
Mouture/mount : Orion Atlas EQ-G
Tube/Scope : Newton Orion 200/1000 (f/5) + MPCC Baader
Autoguiding : Skywatcher Synguider (v1.1) & Meade ETX 70/350 mm
Camera : Canon EOS 400D (Digital Rebel Xti) refiltré Astrodon in Side (modded Astrodon in Side)
+ EOS CLIP CLS Astronomik
Exposure : 40 minutes [40 subexposures of 60 sec each (selected from 40)] @ ISO 1600
Calibration : Dark & Bias : 10/11 @ ISO 1600 - Flat & Dark-Flat : 9 @ ISO 400
Temps/Weather : Bonne transparence. Faible vent nul. T= -3°C. Humidité faible.Lune/moon 57 %.
Constellation : Aurigae / Cocher
Software Used : Astro Photograph Tool (v3.13), DeepSkyStacker 3.3.6, Pixinsight LE, PhotoShop 7, xnview, Noiseware Community Edition
NGC7635 Bubble Nebula (left) and M52 cluster (right) - 19/10/11 - 8" reflector on HEQ5 mount - Nikon D90 + Coma Corrector + LPR Filter, prime focal, guided with SPC880 webcam FinderGuider and PHD, 39 frames (300sec @ISO1600) + 11 frames (600sec @ ISO800) Total Exp:5h05m + 29 EL panel flats, stacked with DeepSkyStacker
NGC4631 Humpback Whale Galaxy
C-11 @ F/2 Hyperstar CGEM-DX on Pier
OverallQuality = 999.81 in Deepskystacker
41 subs 60 sec iso1600 unguided
5 flats
5 darks
5 bias
Total integration 41 minutes.
Canon 450D Full spectrum - self Mod
Filter - LPS2
seeing - better than normal
2nd time on target
Added 45min Ha subs (3x900 bin 1x1) to previous DSLR image.
Takahashi FSQ106ED f/5, QSI683ws CCD, 6nm Astronomik Ha filter, Canon 1100d DSLR (mod), Celestron Advanced Vx Mount, Orion 10x50 Guidescope, MS Lifecam Cinema guide camera.
Sequence Generator Pro, PHD, DeepSkyStacker, Photoshop CS6, Noiseware plug-in, StarSpikesPro 3
William Optics Zenithstar 73
ZwoASI2600MC Pro
Optolong L-Pro broadband filter
PHD2 guided
SharpCap
DeepSkyStacker
Adobe Photoshop CC 2021
29-150 second subs
Image taken with a Nikon D750 and Zenithstar 61 scope, mounted to the iOptron SkyGuider Pro.
Stacked in DeepSkyStacker, then processed in Photoshop.
Widefield Heart and Soul Nebula (top left), Double Cluster NGC 869, 884 (bottom left), Caldwell 10 open cluster (bottom right), and more...
Bower 85mm F4
Canon T4i ISO 800 3 mins
9x lights
6x darks
DeepSkyStacker
iOption SkyTracker
Pixinsight 1.8
A few shots that I took at Redmires early this morning have been stacked using DeepSkyStacker to produce this image of part of the Milky Way
First Star - stack ever. Uses Hugin and Stellarium for Skyrotation and then stacked all the Images with Deep Sky Stacker. The Image is made of 20 Pictures + 5 Darkframes and Postprocessed in Lightroom.
For me at least, its a good first try in Stacking the Milkyway.
First image from the first night with the new AstroTrac. I only got 9 frames before it was time to go to bed (I don't think it's too bad for so few frames).
If you look closely, you can see the North America Nebula (NGC7000), the Veil Nebula, and a all sorts of other stuff.
9 x 4 min at ISO 800, f/4
Canon 350D (modified)
Canon EF 35mm f/1.4L
AstroTrac TT320(K)
Milky Way in the constellation Perseus
*
Teleskop / Kamera:
Montierung: Star Adventurer
Optik:60mm f/3.5
EF-S60mm f/2.8 Macro USM
Kamera: Canon EOS 650D
Guider: -
Filter:-
Aufnahmedaten:
Zahl der Aufnahmen: 9
Brennweite:60 mm
Öffnungsverhältnis: 3,5
Belichtungszeit pro Aufnahme: 30 sek.
Empfindlichkeit ISO-Wert: 1600
Darkframes -
Flats -
Bildbearbeitung:
DeepSkystacker:
Standard / Light = Durchschnitt / Ausrichtung= Automatsch / 100% der Bilder
Photoshop Elements 10:
Tonwertkorrekur, Sättigung
Canon 5D3 with Celestron's CGEM 1100HD. Taken in the Northwoods of Wisconsin with fair seeing and very dark skys. Used ISO 1600 and a stack of eight (using Deepskystacker). Each exposure was 10 minutes with a dark frame of the same time. Manual guiding was done using Celestron's Off-Axis Guider and Orion's 12.5mm illuminated reticle eyepiece. Hope to get more images in the future for greater stack number to reduce grain.
This emission nebula is about 11,000 light-years away and rather dim at Mag 10. Its size is about 15x8 arc-mins (long lenth is 1/2 size of moon). The bright star off-center of the bubble is causing all the action (bubble due to solar winds, red emission due to its radiation). This star is 15 times as massive as the sun.
The reds are H II emissions and these occur very close to the cameras' IR filter so are reduced by a factor of 6 or so (no, I am not going to remove the filter on the 5D3!). These IR filters are unfortunate for astrophotography since the best images are H II regions (but OTOH it stops us from seeing too much of people we photograph!). I think Canin is going to be making the 60A, "A" for astronomy, that has the filter removed.
NGC4631 (The Whale or Herring Galaxy)an edge-on spiral galaxy. Its companion in the field of view is NGC4656/57 (The Hockey-Stick or Crowbar Galaxy) which is a highly warped barred spiral galaxy. Both galaxies can be observed in the constellation Canes Venatici (Hunting Dogs).
The original images were taken on 27.02.17 with a Canon EOS 760D attached to an 11" Celestron Nexstar scope fitted with a Starizona Hyperstar f/2 lens.
Processing with DeepSkyStacker, Photoshp CS4, and NeatImage.