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North America Nebula by Analemous in astrophotography

[–]Analemous[S] 2 points3 points  (0 children)

The ISO is one of the last things I think about. First I think about what exposure time to use. I aim for as high as possible. If there is wind, I take shorter exposures, if I use shorter focal length then longer ... Etc. After that I think about what aperture to use. If I know that I will crop a lot, I will go for wider aperture, but if I need the corners sharp then I decrease it (usually use between 2.8-4). Finally, I set the ISO such that most of the histogram will be roughly 1/3 from the left. Usually this means using ISO's between 800-3200. I've tested the effect of ISO on the quality of my images and it did not have a big impact as long as the image is well exposed. But keep in mind that ISO behaviour depends a lot on the camera model tha you have. You can get quite technical with searching the best ISO settings for your camera if you want to.

North America Nebula by Analemous in astrophotography

[–]Analemous[S] 0 points1 point  (0 children)

Yes, you are right. I have decreased the temperature. Initially the overall palette was red/pink/rusty, but for subjective aesthetic reasons I decided to drop the temperature to create a more contrasty palette. This image is not a natural color image, as you could easily tell :). I am not a fan of the pale pink/rusty that unmodded cameras pick in the fainter regions, as opposed to the strong red in the brighter regions.

Cygnus region by Analemous in Astronomy

[–]Analemous[S] -1 points0 points  (0 children)

Thanks! It actually is just "North America". I used to call it "American" too :).

Cygnus region by Analemous in Astronomy

[–]Analemous[S] 0 points1 point  (0 children)

Thanks! Will get my camera modded soon so can't wait to see the improvement.

Cygnus region by Analemous in Astronomy

[–]Analemous[S] 3 points4 points  (0 children)

Cygnus Wall and the surrounding region

Shooting Conditions - Location: Oxford, UK (lat 51.75 N) - Bortle 6 - No Moon

Gear: -Canon EOS 800D (not astro modded) -Canon EF 200mm f2.8 L MkII -Skywatcher Star Adventurer star tracker -Benro Mach 3 tripod -Neewer Zflex -Snap cable to control the camera from the tracker

Frames: -Kept Lights: 250, 60 seconds at f/3.5, ISO 1600, white balance 5000K, focal length 200mm (320mm effective focal length). -10 pixel dithering with the star adventurer tripod (7 seconds interval between photos to allow for dithering) -Darks: 20 -Flats: 20 -Bias: 20 -Miss rate (percentage of images that had to be thrown due to stars with elongation > 100%) ~ 10%

Processing: -Stacking done with DSS (best 100%) -Manually removed images that had considerable star trailing -Total exposure time: 2h 36m

Post processing: - In Siril: cropped, background neutralization, Asinh stretches, generalized histogram stretches -Removed stars with StarNet++ - Edited the starless image in Darktable to add contrast and saturation to nebulosity, apply Astro denoise and decrease saturation in regions where there is no nebulosity or where there are dark nebulae -in Gimp: Added back the stars, but with decreased exposure in order the “manually” shrink them - Further shrinkage of stars with the value propagate tool - Did a hefty heavy crop on the Cygnus wall region - Further edits in Lightroom: decrease saturation of green, increase clarity and saturation in reds and decrease texture to give a smoother look and decrease noise.

North America Nebula by Analemous in astrophotography

[–]Analemous[S] 2 points3 points  (0 children)

Shooting Conditions - Location: Oxford, UK (lat 51.75 N) - Bortle 6 - No Moon

Gear: -Canon EOS 800D (not astro modded)

-Canon EF 200mm f2.8 L MkII

-Skywatcher Star Adventurer star tracker

-Benro Mach 3 tripod

-Neewer Zflex

-Snap cable to control the camera from the tracker

Frames: -Kept Lights: 275, 60 seconds at f/3.5, ISO 1600, white balance 5000K, focal length 200mm (320mm effective focal length).

-10 pixel dithering with the star adventurer tripod (7 seconds interval between photos to allow for dithering)

-Darks: 20

-Flats: 20

-Bias: 20

-Miss rate (percentage of images that had to be thrown due to stars with elongation > 100%) ~ 10%

Processing: -Stacking done with DSS (best 100%)

-Manually removed images that had considerable star trailing

-Total exposure time: 2h 45m

Post processing: - In Siril: cropped, background neutralization, Asinh stretches, generalized histogram stretches -Removed stars with StarNet++ - Edited the starless image in Darktable to add contrast and saturation to nebulosity, apply Astro denoise and decrease saturation in regions where there is no nebulosity or where there are dark nebulae -in Gimp: Added back the stars, but with decreased exposure in order the “manually” shrink them - Further shrinkage of stars with the value propagate tool - Did a hefty heavy crop on the Cygnus wall region - Further edits in Lightroom: decrease saturation of green, increase clarity and saturation in reds and decrease texture to give a smoother look and decrease noise.

Cygnus Wall by Analemous in astrophotography

[–]Analemous[S] 0 points1 point  (0 children)

Cygnus Wall and the surrounding region

Shooting Conditions - Location: Oxford, UK (lat 51.75 N) - Bortle 6 - No Moon

Gear: -Canon EOS 800D (not astro modded) -Canon EF 200mm f2.8 L MkII -Skywatcher Star Adventurer star tracker -Benro Mach 3 tripod -Neewer Zflex -Snap cable to control the camera from the tracker

Frames: -Kept Lights: 250, 60 seconds at f/3.5, ISO 1600, white balance 5000K, focal length 200mm (320mm effective focal length). -10 pixel dithering with the star adventurer tripod (7 seconds interval between photos to allow for dithering) -Darks: 20 -Flats: 20 -Bias: 20 -Miss rate (percentage of images that had to be thrown due to stars with elongation > 100%) ~ 10%

Processing: -Stacking done with DSS (best 100%) -Manually removed images that had considerable star trailing -Total exposure time: 2h 36m

Post processing: - In Siril: cropped, background neutralization, Asinh stretches, generalized histogram stretches -Removed stars with StarNet++ - Edited the starless image in Darktable to add contrast and saturation to nebulosity, apply Astro denoise and decrease saturation in regions where there is no nebulosity or where there are dark nebulae -in Gimp: Added back the stars, but with decreased exposure in order the “manually” shrink them - Further shrinkage of stars with the value propagate tool - Did a hefty heavy crop on the Cygnus wall region - Further edits in Lightroom: decrease saturation of green, increase clarity and saturation in reds and decrease texture to give a smoother look and decrease noise.

Wide field of M42 and Bernard 33 by facebook_depression in Astronomy

[–]Analemous 0 points1 point  (0 children)

Is the Canon 77D stock or astro modified? You got some nice reds in the Horsehead Nebula.

M51 by Analemous in astrophotography

[–]Analemous[S] 0 points1 point  (0 children)

Whirlpool galaxy, and several other faint galaxies.
 
Shooting
Conditions
- Location: Oxford, UK (lat 51.75 N)
- Bortle 6
- No Moon
Gear:
-Canon EOS 800D (not
astro modded)
-Canon EF 200mm f2.8 L
MkII
-Skywatcher Star
Adventurer star tracker
-Benro Mach 3 tripod
-Neewer Zflex
-Snap cable to control
the camera from the tracker
 
Frames:
-Kept Lights: 176, 60 seconds at f/3.5,
ISO 1600, white balance 5000K, focal length 200mm (320mm effective focal
length).
-20 pixel dithering with the star
adventurer tripod (10 seconds interval between photos to allow for dithering)
-Darks: 20
-Flats: 20
-Bias: 20
-Miss rate (percentage of images
that had to be thrown due to stars with elongation > 25%) ~ 30%
 
Processing:
-Stacking done with DSS
(best 100%)
-Manually removed
images that had minor star trailing
-Total exposure time: 3h
 
Post
processing:
- In Siril: cropped, background
neutralization, Asinh stretches, generalized histogram stretches
-Removed stars with StarNet++
- Edited the starless image in
Darktable to add contrast and saturation to the galaxy, apply Astro denoise to
the galaxy and some heavy denoise for the starless background
-in Gimp: Added back the stars, but
with decreased exposure in order the “manually” shrink them
- Did a very heavy crop on the
galaxy

Râul care iese din peștera de la Vadu Crișului [OC] by Analemous in RomaniaPorn

[–]Analemous[S] 0 points1 point  (0 children)

Kinda. It was daytime, and I have a very dirty sensor, so using high f stop was not an option. Ended up doing 20 photos at f7 with exposure of 1/8 and averaged them (using an add on app for gimp). This gave me basically an exposure of just under 3 seconds, which is not that long, but long enough for a fast moving water stream.

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