Quote:
Originally Posted by 78SA
Nikon D750, Sigma 150-600, F6.3 for 3 seconds. Top one was F20 for 3 seconds using a Nikon 300 F4 lense.
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That D750 has a wonderful sensor for low light! You'll be able to get some great results with it.
I've been doing a lot of astrophotography the past year or so but most everything has been done with a wide angle f2.8 lens shot wide open, usually at 3200 ISO. With a 14mm lens, you can use shutter speeds approaching 30 seconds before the stars begin to blur noticeably from the Earth's rotation.
Stop me if you know about this but there's a "600 rule" to determine how long your exposure can be for a given focal length before blurring becomes a problem. Just divide your effective focal length into 600 and the result is the number of seconds. With a crop sensor, you have to multiply the focal length by the crop factor before dividing into 600. Of course your D750 is full frame so you don't have that issue.
With your 300 f4.0 lens you should be able to shoot for 2 seconds or so. Crank the ISO way up on your D750. I've seen shots taken at 6400 and even 12,800 with a D750 that look pretty good.
It's common to take several shots and stack them in software to reduce the noise from the higher ISO.
With an f4.0 300mm I'll bet you can get some stunning nebulae shots.
Strongly suggest shooting raw if you have Lightroom or other software to edit. You'll be able to bring out the subtle colors you would never see with JPGs.
