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M81 & M82, M1, M33 with Nikon D7200

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My next 3 images from December 2015, May 2016 and February 2016. All taken with Nikon D7200, SW150/750 and guided HEQ5Pro at Lisow (35km from Czestochowa, Poland)
BTW I've got a question... Which settings are better for D7200? Higher ISO (eq. 1600) and 300sec frames or lower (ISO400 or 800) and 480sec light frames?

M81 and M82 (May 2016)
7x300s ISO800 3x dark


M33 (December 2015)
11x300s ISO1600 only 1 dark frame


M1 (February 2016)
3x300s ISO800 3x dark (only 3 light frames because of very poor weather and high clouds)



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As far as I know, ISO 1600 with say 300s exposure doesn't give the same result as ISO 800 with 600 s exposure. I guess that is because the sensitivity function is not a line if plotted against the ISO. So, I think that you should go for the lower ISO since it gives you less noise. Furthermore, I am not sure the noise varies linearly with the ISO either. The best thing you can do is to search for those graphs online, for your model, of course. This will provide you with a way to compare these two setting. :happy11:


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Thank you all, guys!

Dinu Adrian, thanks for your advices and great manual. Last night I took a photo of NGC6888 with ISO800 and 300s frames and I think this is the best settings for my DSLR. I will upload an image in separate thread.




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