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Nikon D5500 & Beginner Imaging

astrophotography beginner dso imaging reflector
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#1 TSA178

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Posted 15 July 2020 - 01:12 PM

I am new to astrophotography & a couple nights ago I decided to image M81 (Bode's Galaxy) & M81 (Cigar Galaxy). I noticed that after looking back at the single shot it was very bright. Is there anyway to fix this? I use Astro Photography Tool to create the imaging plans.

The imaging plan is 180x15. Once again I am completely new to this hobby & any advice would be greatly appreciated

 

Telescope:

Explore Scientific First Light 203mm/1000mm f/ratio 4.9

 

Mount:

EXOS2GT

 

Camera:

Nikon D5500

 

Imaging:

ISO 400

180s exposure

 

The single shot is attached below.

Attached Thumbnails

  • L_0030_ISO400_180s__NA.jpg

Edited by TSA178, 15 July 2020 - 01:19 PM.

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#2 fmeschia

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Posted 15 July 2020 - 03:16 PM

Hard (impossible) to judge if it’s too bright or not from what looks like an auto-stretched image. Does APT show you a linear (non-stretched) histogram?



#3 TSA178

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Posted 15 July 2020 - 03:19 PM

APT does not show me a linear histogram. I want to take long exposure shots to pull out detail of the galaxies but the longer the exposure is the brighter the whole image becomes.



#4 N5SE

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Posted 15 July 2020 - 03:23 PM

APT does not show me a linear histogram. I want to take long exposure shots to pull out detail of the galaxies but the longer the exposure is the brighter the whole image becomes.

If thats the case I believe you need to lower the ISO settings.



#5 TSA178

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Posted 15 July 2020 - 03:25 PM

What would be an ideal ISO setting?

#6 N5SE

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Posted 15 July 2020 - 03:50 PM

What would be an ideal ISO setting?

 

You'd have to experiment, depends on your area with regard to light pollution, and further information can be obtained by looking at graphs showing gain results from the sensor tests.

 

https://www.photonstophotos.net/

 

Is a great resource.

 

But the easiest way at this stage would be to take some test shots at different ISO and exposure lengths. Note that the longer the exposure, typically the lower the ISO and vice versa.



#7 Craig H

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Posted 15 July 2020 - 07:27 PM

TSA -- 

 

To my eye this looks like a decently-timed sub if this is right out of your camera - on your D5500 itself if you still have your shots on your camera when you are reviewing your photos you can hit the up or down arrows to find your histogram function, if the histogram peaks around 20-25% of max that's about right.  If you took those photos from a suburban area that level of sky glow is to be expected.  You will have to learn how to take good flats to compensate for the sky glow and/or get a program that will subtract out the glow for you though.

 

Cheers

Craig.



#8 wsbrown

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Posted 15 July 2020 - 08:53 PM

Just me, YMMV, but I prefer DigiCam control for running my D5300. I recently acquired APT and I know it is capable of a lot, but DigiCam is just so much easier to use and my camera responds to it better too. DigiCam also does a great job of communicating with PHD2 to dither.

Oh and its free to boot.



#9 17.5Dob

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Posted 15 July 2020 - 09:13 PM

What would be an ideal ISO setting?

With the D5500, ISO 200 is THE BEST,..from there adjust your exposure length..



#10 Kevin_A

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Posted 16 July 2020 - 09:20 AM

Definitely ISO200 or ISO400 depending on your sky brightness and mount accuracy.

 

I am in bortle 4 sky and my camera histogram is somewhere between 1/4 to 1/3 for ISO400 X 180 second subs and I also try to use ISO200 X 240 to 300 seconds when I can to get a bit more signal. ISO200 is the best if your mount can handle tracking 4-5 minute subs. I switch due to the fact that some nights I have a lot of slow and low propeller planes that are too frequent for getting many 4-5 minute sub keepers.




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