I want to add DLSR lenses to my equipment list so I can model the FOV through my DSLR for each lens. Adding the actual DLSR is easy but I am a bit confused about adding the lenses. When entering a telescope I enter the aperture and the focal ratio and it automatically computes the focal length. What should I do with DSLR lenses? For example, the Rokinon 14mm f 2.8. Should I just enter the aperture as 14mm and the focal ratio as 1 as that will spit out the focal length as 14mm?
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Keiron Smith Official comment There is no facility to add DSLR lenses to SN right now.
The assumption is that you’re using it with a telescope, not just standalone with a lens.That said, it’s a decent feature request and something we can look into and, so, appropriately, we have moved this post to the Starry Night 7 Feature Requests forum.Thanks so much for your feedback! -
Tim Campbell The focal ratio (in this case 2.8) is the ratio of the lens focal length divided by the widest possible clear aperture diameter.
In other words 14 ÷ ? = 2.8.
You can turn that around and just do 14 ÷ 2.8 = 5
Your lens has a 5mm aperture diameter (at f/2.8).
Of course, it would be nice if we could enter just opt to enter the focal ratio instead of the diameter.
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Keiron Smith Thanks, Tim!
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