| Joined: | Mon Apr 2nd, 2012 |
| Location: | Carthew, Cornwall, United Kingdom |
| Posts: | 6874 |
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Try to get a lens that is at least f/2.8 for fixed tripod shots so you can use relatively short exposures. This will lessen the amount of star trailing you get when shooting on a fixed tripod. If you are shooting on a polar-aligned equatorial tracking mount, the f/stop of the lens is not as critical because you can always shoot longer exposures without trailing.
This is a good primer.
http://www.digitalcameraworld.com/2015/08/23/best-camera-settings-for-astrophotography/#null
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