Nikon Nikkor Fish eye lenses?

What are some older manual focus / AI fish eye lenses?

Also, what's the most affordable fish eye [non-DX]

Willing to look at off brand lenses too

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Canon VS Sony VS Nikon?

Which camera is the best for vlogging?

I'm 26 years old, I'm thinking about starting a vlog, and I need the perfect camera one of the aspects of being a youtuber are having good qualities on your videos.

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I'm a bit confused about the focal length thingy of DSLR lenses. Can you clarify a bit?

I'm looking to buy Nikkor 40mm 2.8 for jewelry photography but everyone keeps saying that focal length is too less which makes minimum focus distance less too. So if I take jewelry pics and I'm not close to the minimum focus distance but a little further from the minimum focus distance, will it effect the pictures quality? I will be using the focus stacking technique.

Read more: I'm a bit confused about the focal length thingy of DSLR lenses. Can you clarify a bit?