A:AnswerYes I believe it is compatible of course you'll still get the crop sensor view on it but if you don't use such a small aperture you'll be fine with the vignette you get. I used it on my nikon D850.
A:AnswerAutofocus capability is available when using AF-S type lenses on a Nikon D3000 DSLR camera. The Nikon AF-S DX NIKKOR 35mm f/1.8G lens listed here is fully compatible with this camera and will provide autofocus.
A:AnswerNo. This is not compatible. The Nikon FM2 is an AI-type (Automatic Maximum Aperture Indexing) camera which performs full-aperture metering with AI-type lenses. For compatible lenses look into AI or AI-S type lenses.