fit with my D3100 ?? Does the Nikon 50mm f/1.8D AF Nikkor Lens fit and work with the Nikkon D3100 ? why i heard that i can't buy any lens not DX ?? and is this lens has auto focus built in or not ?? ty all for help
Yup, if you're comfortable using manual focus this will work with your D3100. With that said, I'd probably put my money towards the 35mm 1.8 (Nikon 35mm f/1.8G AF-S DX Lens for Nikon Digital SLR Cameras). It's more expensive and can be a little hard to get your hands on, but it will auto focus with the D3100. However, if you want a great lens to shoot static images (product shots, nature shots, even portraits) you really can't go wrong for the price. If you plan on taking candid pics of your kids or other non-posed pics, expect to loose some nice shots while you're trying to manually focus.
You can buy a lens that is not DX and many will work fine. This one above will not auto focus. The Nikon AF and AF-D will not work on a camera that does not have an internal focus motor, like the D3100. The later lenses, AF-S, will work and auto focus. If the lens is an FX you will not get an image that is as wide and tall as what you see in the finder on a DX camera. You will get a good sharp image but you must compose more carefully to avoid the DX sensor cropping out vital parts of the image the FX lens can see.