View allAll Photos Tagged Subframing

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Photographed at Algonquin Provincial Park, Ontario, Canada

(285 km by road north of Toronto)

* Temperature 11° C.

 

* Total exposure time: 8 minutes.

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Description:

 

High in the northern hemisphere summer and autumn sky our home galaxy, the Milky Way, runs through the constellations Cepheus (left side) and Cygnus (right).

 

This area of the sky is riddled with glowing red clouds of hydrogen gas, numerous star clusters, and areas of dark foreground gas that obscures the light of millions of stars beyond.

 

Above and to the left of centre is the bright circular red gas cloud IC 1396. For a close-up view of this nebula made with a 540 mm focal length telescope later the same evening, click here:

www.flickr.com/photos/97587627@N06/30787835700

 

One of the most distinctive gas clouds is the aptly named "North America Nebula", just below and a little right of centre. For a close-up view of this nebula made with a 300 mm lens, click here:

www.flickr.com/photos/97587627@N06/29220929561

 

For a version of this photo WITH labels, click on the right side of your screen, or click here:

www.flickr.com/photos/97587627@N06/30348287793

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Technical information:

 

Sigma 50 mm f/1.4 DG HSM ART lens on Nikon D810a camera body, mounted on Astrophysics 1100GTO equatorial mount with a Kirk Enterprises ball head

 

Eight stacked frames; each frame:

50 mm focal length

ISO 2500; 1 minute exposure at f/4; unguided

(with LENR - long exposure noise reduction)

 

Subframes registered in RegiStar;

Stacked and processed in Photoshop CS6 (brightness, contrast, levels, colour balance, colour desaturation)

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Test image after installing a HyperStar unit on my 11" Celestron EdgeHD. This lens converts the F/10 telescope to F/2. Typically my sub frames would be 20-30 minutes each at F/10, I used 5 minutes each with the new setup at F/2

 

Camera: QHY23M

Mount: CGEM-DX

 

HA- 10 subframes x 300 seconds each- mapped as green channel

OIII- 10 subframes x 300 seconds each- mapped as blue channel

SII- 10 subframes x 300 seconds each- mapped as red channel

 

2h 30m total

 

IC1805 aka the Heart Nebula is an emission nebula located in the constellation of Cassiopeia about 7500 light years away.

In the center of this image is a "knot" known as Melotte 15. I imaged this region using this telescope at F/7 resulting in a smaller FOV seen here: flic.kr/p/p8BWvp

 

Visit my Blog astrochuck.blogspot.com/

City of Wells Steam Loco - East Lancashire Railway

This was taken on a partly cloudy night. I sorted through the subframes and deleted ones with clouds. One gets desperate for clear skies after awhile.

 

Dwarf 3: 142 45-second exposures.

passer-by records a street music band on her mobile phone

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Photographed from mid-town Toronto, Canada

* Temperature -6° C. the first night; 0° C. the second night; -4° C. the third night

 

This three-frame assemblage shows how the appearance of the Moon changes from one night to the next, as the terminator (the dividing line between day and night) moves from right to left across the visible face of the Moon. On average, the terminator moves across the Moon's face about 12.7° per 24 hours, as the Moon orbits planet Earth once per month.

 

The time difference between the right and middle frames was 25 hours, and between the middle and the left frames was 28 hr, 20 min.

 

In the right frame, the Moon is 96.2% illuminated by the Sun; in the middle frame, the illuminated portion has decreased to 90.6%, and in the left frame the illuminated portion is 82.1%.

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Nikon D810 camera body on Explore Scientific 152 mm (6") apochromatic refracting telescope (explorescientificusa.com/products/152mm-apochromatic-refr...), mounted on Sky-Watcher AZ-EQ6 SynScan mount (ca.skywatcher.com/_english/02_mounts/02_detail.php?sid=65).

 

1200 mm focal length, f/8

 

* ISO 100 or 125, multiple stacked 1/250 sec. exposures

 

Subframes stacked in Registax

Processed in Photoshop CS6

(brightness, contrast, colour desaturation, sharpening, image rotation)

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Manufacturer: Lancia Automobiles S.p.A., Turin - Italy

Type: Beta Coupé 1600 Tipo 828 1a Series

Production time: mid-year 1974 - mid-year 1975

Production outlet: 1,978

Engine: 1592cc straight-4 Fiat Twin Cam 828AC.000 DOHC

Power: 108 bhp / 6.200 rpm

Torque: 135 Nm / 4.500 rpm

Drivetrain: front wheels

Speed: 180 km/h

Curb weight: 1010 kg

Wheelbase: 92.5 inch

Chassis: box frame with subframe and self-supporting aluminum uni-body

Steering: rack & pinion

Gearbox: five-speed manual (transversely in-line) / all synchromesh / floor shift

Clutch: single dry plate disc

Carburettor: Weber 34 DMTR21 / Solex C34 CIC-1

Fuel tank: 51 liter

Electric system: 12 Volts 45 Ah

Ignition system: distributor and coil

Brakes front: 9.88 inch hydraulic discs

Brakes rear: 9.88 inch hydraulic discs

Suspension front: independent MacPherson struts, parallel transverse links, lower wishbones, sway bar, coil springs + internal telescopic shock absorbers

Suspension rear: independent MacPherson struts, multi-link, parallel double lower wishbones (A-arm, control arm), sway bar, coil springs + internal telescopic shock absorbers

Differential: helical axle drive 4,214:1

Wheels: 5½J x 14 inch

Tires: 175/70 SR 14

Options: ZF power steering

 

Special:

- The Beta (1972-1984) was the company's first new model introduced by Lancia after it had been taken over by FIAT in 1969.

- Vincenzo Lancia used letters of the Greek alphabet for his early cars, like Alpha, Beta, Gamma, etc., and as such, Beta had been used on two previous vehicles.

- This 2+2 Coupé, designed in-hous led by Aldo Castagno (Lancia) and Pietro Castegnero (from Carozzeria Pininfarina S.p.A., Cambiano - Italy, but acting as styling consultant), is based on a shortened Berlina chassis (100 inch) and has also the first ever multi-link rear suspension used in a mass produced car, designed by Sergio Camuffo.

- The Beta Series was assembled in Turin (Italy) and in Pamplona (Spain).

Prague, Czech Republic

His Name is Stephan. and he is german. we travelled around with him for a couple of days and ended up sharing a bamboo house boat in Kerela for a night. During My three month stay in india, i met many different people from all over the world. After meeting Stephan, i can now say that Germans are my favorite! i love the ripples around his body and how they subframe him into a little motif

 

Sensia 200 @ 800 cross processed at a shitty lab in Mumbai

Tech: Pentax K1000 35mm

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Photographed from mid-town Toronto, Canada, at 21.05 EST (Moon altitude: 61° | Sun 42° below the horizon)

* Temperature -10° C.

 

The weather has been so bad in southern Ontario for the last almost two months that tonight was the first time since Nov. 22 that I have had the telescope out under a clear sky!

 

The Moon, in its waxing gibbous phase and 78% sunlit, was riding high over Toronto tonight, just four nights before the total eclipse of the Moon this coming Sunday night. It was quite cold, but there was no wind to blow the telescope around, so I was able to get very clear, high resolution base images from which to make this image.

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Nikon Z7 camera body on Explore Scientific 152 mm (6") apochromatic refracting telescope, mounted on Sky-Watcher AZ-EQ6 SynScan mount.

 

Best nine of twelve identical stacked frames - each frame:

● 1253 mm focal length

● ISO 100, 1/250 sec. exposure, f/8

 

Subframes stacked in Registax

Processed in Photoshop CS6

(cropping, brightness, contrast, colour desaturation)

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Taken at the Victoria & Albert Museum, London, and inspired by the Saul Leiter Exhibition at The Photographer's Gallery

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Photographed at Algonquin Provincial Park, Ontario, Canada, between 03.10 and 03.38 EDT

(285 km by road north of Toronto)

* Altitude of nebula at time of exposures: 31-34°

* Temperature -2° C.

 

* Total exposure time: 13 minutes

* 540 mm focal length telescope

 

For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:

www.flickr.com/photos/97587627@N06/30004438900

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Description:

 

I cannot think of a more famous or more often photographed and observed object in the night sky than M42 & 43 in the constellation Orion. This nebula is visible to the unaided eye smack in the centre of the sword of Orion, hanging down from Orion's three-star belt.

 

From Wikipedia:

"The Orion Nebula ... is one of the brightest nebulae, and is visible to the naked eye in the night sky. M42 is located at a distance of 1,344 ± 20 light years and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light years across. It has a mass of about 2000 times the mass of the Sun."

 

For more information about this object, click here:

en.wikipedia.org/wiki/Orion_Nebula

 

For another photograph of this nebula made in March 2017, click here:

www.flickr.com/photos/97587627@N06/32743247300

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Technical information:

 

Nikon D810a camera body on Teleview 101is apochromatic refracting telescope, mounted on Astrophysics 1100GTO equatorial mount using an ADM Accessories side-by-side saddle

 

Main body of the nebula:

Thirteen stacked frames; each frame:

540 mm focal length

ISO 3200; 1 minute exposure at f/5.4; unguided

(with LENR - long exposure noise reduction)

 

Centre of the nebula:

Eight stacked frames; each frame:

540 mm focal length

ISO 2000; 15 seconds exposure at f/5.4; unguided

 

Subframes registered in RegiStar;

Stacked and processed in Photoshop CS6 (levels, brightness, contrast, colour balance, sharpening)

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Canon 500N & ef 28-80mm, Fomapan 400 in xtol1:1

Dwarf mini, EQ mode, duo band filter, gain 60, 1h 34m, subframes da 45s, elaborazione con AstroWizard.

The Wester Veil with more data 7,5h

This is the first time I use this method on pixinsight, (HOO combination).

 

-Equipment-

Scope: TS-Optics 94/414 EPDH (414mm focal)

Camera: ZWO ASI533MC Pro at -5°C

Guiding: ZWO OAG

Guiding camera: ZWO ASI 120MM

Mount: Skywatcher EQ5

Filter: Optrolong L-eXtreme

 

-Acquisition-

Light : 90x300s (7,5h) at Gain:101 Offset:49

Dark,Flat,Offset

Date : Take on 5 night from 06/13/2021 to 07/12/2021

Location : France-Alsace Bortle 4/5

 

-Software-

Carte du Ciel, N.I.N.A, Phd2 , PoleMaster and PixInsight

All Processing in Pixinsight

Use EZ_Processing Suite(by darkarchon) in Pixinsight

ForaxX Color combination thecoldestnights.com/

 

-Pre Processing-

Image Calibration

Cosmetic Correction

Debayer

Subframe Selector

Star Alignement

Local Normalization

Drizzle x2

Crop the black bands from the stacking

 

-Processing-

 

Dynamic Background Extraction

Split RGB Channels

Combine 70% of green and 30% of blue into 'Oiii'

Rename R to Ha

EZ_SoftStretch Ha and Oiii

Pixelmath: HOO combination with ForaxX expressions

R = Ha

G = ((Oiii*Ha)^~(Oiii*Ha))*Ha + ~((Oiii*Ha)^~(Oiii*Ha))*Oiii

B = Oii

Curve Transformation ( RGB/K, Hue, Saturation,...)

SCNR (Green 40%)

EZ_HDR

EZ_Star Reduction

 

Clear skies !

There are a number of other galaxies in this image in addition to M101 centered. They are smaller and many are clustered near M101. Near the top and off to the right is NGC5422. Near the bottom and a bit to the left is NGC5474. There are others that might be mistaken for stars.

 

Dwarf 3 smartscope

 

206 45-second subframes | 60 gain | total exposure time 153.75 minutes

The Rosette Nebula consists of an open star cluster and a large emission nebula. It is a few degrees east of the star Betelgeuse in the sky. Although I have captured it many times in wide field shots of the area around Orion, I never made a dedicated effort on the nebula itself before this. The light used here was all from the 656 nm line of hydrogen emission. I might go back later and add an oxygen channel, but I thought this result was worth sharing.

 

I shot this mosaic over seveal nights from 2022-01-28 through 2022-02-01. It's a five panel mosaic, with stacks of 2 minute exposures for each of the five tiles, ranging from 31 up to 54 subframes. Imaging was done with a Celestron Edge HD 925 with Hyperstar and an Atik 414-EX monochrome CCD with an Atik H-alpha filter. Preprocessing in Nebulosity; mosaic compilation and other processing done in PixInsight.

NGC 4039, the antennae galaxy, LRGB 8.5 hours total, 16min subframes, telescope GSO 30cms f8 native (mild descollimation), camera STT8300 at -35°C, AO-8 unit; from La Colonia, Illapel, Chile. This is a tribute to my Master (RIP) Daniel Verschatse who won a prize with this same object years ago.

 

Comet C/2022 E3 (ZTF) I imaged this remotely from Spain 31st December 2022 4:30am with Epsilon 180ed and ZWO ASI2400MC pro. Exposure time was 45mins total using 60s subframes.

Cheers

Peter Shah

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Photographed at Algonquin Provincial Park, Ontario, Canada, between 03.00 and 03.24 EDT

(285 km by road north of Toronto)

* Temperature 12° C.

 

* Total exposure time: 11 minutes

* 540 mm focal length telescope

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Description:

 

This faint and visually very elusive nebula can be photographed to advantage only in a good dark sky.

 

Known as the "California Nebula" because of its shape, this glowing cloud of red hydrogen gas is quite large; about five times as long as, and a little wider than, the Moon appears in our sky. The nebula is located 1,000 - 2,000 light years from our solar system, and is about 100 light years from end to end. Radiation from the nearby blue-white star Xi Persei (the brightest star in the frame, below the nebula) causes the nebula to fluoresce.

 

The California Nebula was discovered by famed American astronomer E.E. Barnard in 1884-5, just in time to be added to Dreyer's New General Catalog (NGC).

 

For a version of this photo WITH STAR LABELS, click on your screen to the RIGHT of the photo, or click here:

www.flickr.com/photos/97587627@N06/28723113074

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Technical information:

 

Nikon D810a camera body on Teleview 101is apochromatic refracting telescope, mounted on Astrophysics 1100GTO equatorial mount with a Kirk Enterprises ball head

 

Eleven stacked frames; each frame:

540 mm focal length

ISO 4000; 1 minute exposure at f/5.4; unguided

(with LENR - long exposure noise reduction)

 

Subframes registered in RegiStar;

Stacked and processed in Photoshop CS6 (brightness, contrast, colour balance, levels)

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This is my best comet image to date. I can see a fair amount of detail in the dust tail, and a decent showing of the "forward" pointing ion tail.

 

I am not able to identify the fuzzy blob seen directly above the nucleus as seen in this image. PixInsight Annotation script does not show an object at this location. I cannot see an outburst in any of the subframe data. Please comment with any ideas.

 

ZWO ASI6200MM-P/EFW 2" x 7 (L)

Tele Vue NP101 (4" f/4.3)

Losmandy G11

 

Luminance filter only.

2s x 24 subs = 2m total integration time

 

Processied in PixInsight

Finished in Affinity Photo

 

Manufacturer: Alvis Car and Engineering Company Ltd, Coventry - UK

Type: TB 21 Roadster / 3 Liter Sports

Production time: mid-year 1950 - mid-year 1952

Production outlet: 31

Engine: 2993cc straight-6 OHV seven-bearing short-stroke engine (by ALVIS)

Power: 96 bhp / 4.000 rpm

Torque: 186 Nm / 1.800 rpm

Drivetrain: rear wheels

Speed: 143 km/h

Curb weight: 1280 kg

Wheelbase: 111.5 inch

Chassis: ladder frame with a bolted subframe and separate steel body (by AP Metalcraft, Coventry - UK)

Steering: Marles spindle & nut

Gearbox: four-speed manual / II, III and IV synchronized / floor shift

Clutch: Borg & Beck type 9 A6-G single dry plate disc

Carburettor: single horizontal 38 mm SU H4 (+ electric pump from petrol tank)

Fuel tank: 65 liter

Electric system: Lucas 12 Volts 63 Ah

Ignition system: distributor and coil

Brakes front: hydraulic 11 inch Lockheed drums (two-leading-shoe type)

Brakes rear: hydraulic 11 inch Lockheed drums (two-leading-shoe type)

Suspension front: independent trapezoidal triangle crossbars, silentbloc bushes, sway bar, coil springs + double acting Armstrong hydraulic piston dampers

Suspension rear: rigid axle, silentbloc bushes, longitudinal semi-elliptic leaf springs + double acting Armstrong hydraulic piston dampers

Rear axle: live semi-floating type

Differential: hypoid bevel final drive 3.77:1

Wheels: 15 inch steel discs

Tires: 6.00-15

Options: cloth cap, steel spoke wheels

 

Special:

- This 3 Liter Roadster (or Sports), based on the TA 14, was up against the Jaguar XK 120, released a year earlier the Sports Car market.

- It was not a success for Alvis (only 31 sold!!!), while Jaguar sold thousands XK 120’s (XK 120 Roadster: 7,612 units built, XK 120 Cabriolet: 1,765 units built and XK 120 Coupé: 2,678 units built).

- The Alvis TB 21 Roadster, assembled in Coventry, was too expensive at £1598 on the home market.

 

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Photographed at Algonquin Provincial Park, Ontario, Canada

(285 km by road north of Toronto)

* Temperature 11 degrees C.

 

Total exposure time: 15 minutes.

* 540 mm focal length telescope

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Description:

 

This is a large and quite faint emission nebula and star forming region over 100 light-years across, located about 2,400 light-years away in the constellation Cepheus. It is energized by the bright, bluish central multiple star. The very small Elephant’s Trunk nebula (IC 1396A) is inside the dark elongated globule just to the right of centre.

 

From one web site: "The brightest star (38,000 times brighter than the Sun) ... [at the lower left edge of the nebula] is mu Cephei. It is a red supergiant star with a diameter larger than the orbit of Saturn, some 2536 times the diameter of the Sun. It is one of the largest stars we know of. Also called Herschel’s Garnet Star, mu Cephei is a variable star that varies in magnitude from 3.4 to 5.1 over a period of approximately 730 days."

 

For a view of this same nebula made with a 200 mm lens on July 1 of this year, click here:

www.flickr.com/photos/97587627@N06/28078652915

 

For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:

www.flickr.com/photos/97587627@N06/31041148481

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Technical information:

 

Nikon D810a camera body on Teleview 101is apochromatic refracting telescope, mounted on Astrophysics 1100GTO equatorial mount with a Kirk Enterprises ball head

 

Fifteen stacked frames; each frame:

540 mm focal length

ISO 6400; 1 minute exposure at f/5.4; unguided

(with LENR - long exposure noise reduction)

 

Subframes registered in RegiStar;

Stacked and processed in Photoshop CS6 (brightness, contrast, colour balance, levels)

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Scrapped, the last MOT expired September 2012 when it failed a test. Rotten front subframe mounts.

Seen in Fratton.

Not to be confused with the Loch Ness Monster Nebula.

 

LdN-768 on the left side a bit below the middle.

 

I would like to take this image again’t with the Dwarf 3 to capture a bigger section and get slightly better resolution.

 

Seestar S50

582 ten-second subframes.

Prague, Czech Republic

The Tyne ferry "Pride of the Tyne" viewed within the mechanism which raises and lowers the landing with the tides.

The constellation of Cygnus has a lot of interesting things to photograph and covers a wide areas of the night sky. In this image you can find NGC 6910 aka Rocking Horse Nebula, which is a loose collection of stars. You can find SH2-108 the Butterfly Nebula. The dominant star is yCyg.

 

Semester S50

724 ten-second subframes

This image of NGC1499 was generated from the monthly image data given to iTelescope subscribers. The data was captured on their T80 telescope at E-Eye Fregenal de la Sierra on 27/10/2023.Because so few files had already been calibrated, the master files were created in AstroPixelProcessor before being processed in Pixinsight. The image is made up from 6 x LRGB 180s subframes giving a total integration time of 1.2 hours.

Manufacturer: Renault S.A., Boulogne-Billancourt (Paris) - France

Type: NN Torpédo 6CV

Production time: 1924 - 1928

Production outlet: ± 150,000

Engine: 951cc straight-4

Power: 15 bhp / 1.980 rpm

Drivetrain: rear wheels

Speed: 60 km/h

Curb weight: 810 kg

Wheelbase: 104.7 inch

Chassis: ladder frame with wodden subframe and separate body

Steering: screw and nut

Gearbox: three-speed manual + reverse / floor shift

Electric system: Bosch 12 Volts with starter/generator by Rhone, Paris

Ignition system: Bosch magneto

Brakes front: mechanical drum brakes

Brakes rear: mechanical drum brakes

Suspension front: semi-elliptic leaf springs

Suspension rear: transverse leaf springs

Rear axle: live

Differential: spiral bevel

Wheels: closed discs

 

Special:

- The model NN, aka Renault 6CV, was designed by Louis Renault and at first shown at the 1924 Mondial de l'Automobile in Paris.

- In the early '20s Renault released a series of new models, recognizable by their "cheese plate radiator” or "shovel-nosed" hood, with prominent "gills" on the sides of the bonnet/hood for cooling.

- The radiator was placed behind the engine, with the gas tank behind that (note the two caps on the hood).

- In 1927 it became the first car to make a solo trip across the Sahara Desert.

- The NN Series was assembled in Billancourt, France and available as this 2-door Roadster, as 2-door Coupé Limousine, as 4-door Torpédo, as 4-door Landaulet-Taxi, as 4-door Limousine and as rolling chassis for coachbuilders.

- In 1928 the larger and heavier NN2 was introduced (1928-1929), recognizable by the bumpers.

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Photographed at Algonquin Provincial Park, Ontario, Canada

(285 km by road north of Toronto)

between 23.10 and 23.13 EDT

* Altitude of comet's head at time of exposures: ~12°

* Temperature 17° C.

 

* Total exposure time: 1.25 minutes

* 105 mm focal length lens

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Description:

 

This comet has been touted as the brightest in a generation. The last comet that I can remember being this bright was Comet Hale-Bopp in 1997, which was undoubtedly the best comet that i will have seen in my lifetime.

 

This visitor to the inner solar system was discovered on March 20 this year by astronomers during the NEOWISE mission of the Wide-field Infrared Survey Explorer (WISE) space telescope (hence the name of the comet). It reached naked eye visibility this month, and I finally got into a dark sky - with no Moon in the sky to wash out the fainter outer reaches of the tail - on July 17.

 

In this view we see the bright head of the comet at the bottom near the horizon, with the broad yellowish dust tail fanning out to the right, and the fainter, narrow bluish plasma or ion tail bordering the dust tail to the left.

 

At the time of this photo, Comet Neowise was 78 million km (0.52 astronomical units ("AU") - the distance from Earth to the Sun) from the Sun, and 109 million km (0.73 AU) from Earth, and shone at a brightness of third magnitude, with a 10 degree tail.

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Technical information:

 

Nikkor AF-S 70-200 mm f/2.8 G ED VRII lens on Nikon D810a camera body, mounted on Astrophysics 1100GTO mount with a Kirk Enterprises ball head

 

Six stacked frames; each frame:

105mm focal length

ISO 3200; 30 sec. exposure at f/5.6; unguided

With long exposure noise reduction

 

Subframes stacked in RegiStar;

Processed in Photoshop CS6 (levels, brightness / contrast, colour balance, deblurring of tree horizon)

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Sunset through the rock hole

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Photographed at Algonquin Provincial Park, Ontario, Canada

(285 km by road north of Toronto)

between 23.10 and 23.13 EDT

* Altitude of comet's head at time of exposures: ~12°

* Temperature 17° C.

 

* Total exposure time: 1.25 minutes

* 660 mm focal length telescope

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Description:

 

This comet has been touted as the brightest in a generation. The last comet that I can remember being this bright was Comet Hale-Bopp in 1997, which was undoubtedly the best comet that i will have seen in my lifetime.

 

This visitor to the inner solar system was discovered on March 20 this year by astronomers during the NEOWISE mission of the Wide-field Infrared Survey Explorer (WISE) space telescope (hence the name of the comet). It reached naked eye visibility this month, and I finally got into a dark sky - with no Moon in the sky to wash out the fainter outer reaches of the tail - on July 17.

 

In this view we see the bright head of the comet at the left side, with the broad yellowish dust tail fanning out to the right, and the fainter, narrow bluish plasma or ion tail bordering the dust tail at the top.

 

At the time of this photo, Comet Neowise was 78 million km (0.52 astronomical units ("AU") - the distance from Earth to the Sun) from the Sun, and 109 million km (0.73 AU) from Earth, and shone at a brightness of third magnitude, with a 10 degree tail.

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Technical information:

 

Nikon D810a camera body on Tele Vue 127is (127 mm - 5" - diameter) apochromatic astrograph, mounted on Astrophysics 1100GTO equatorial mount

 

Five stacked frames; each frame:

660 mm focal length

ISO 3200; 15 sec. exposure at f/5.2; unguided

With long exposure noise reduction

 

Subframes stacked in RegiStar;

Processed in Photoshop CS6 (levels, brightness / contrast)

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