I got a Nikon D40 ..what xx to 300 mm lense would be good...Nikor or Tamron

It really depends on what subjects you will be shooting, how much you will use it and what your budget is. The Nikon (NIKKOR) lenses are more ruggedly built than similar products from Tamron or Sigma. Optically, I think that the Tamron would be a good lens, just not as durable. I have shot with Nikons since 1973 and have only ever bought NIKKOR lenses. I use my cameras and lenses every day, so they see a lot of use and, inevitably, a certain amount of abuse--shooting in rain, snow, bumps, scrapes, etc. If you only use your D40 once every 2 or 3 weeks, the Tamron will probably fill your need. As to subject, I think you will find the 300mm lens to be too long for sports. I have both the 18-200mm DX NIKKOR and the 70-200 FX NIKKOR lenses and they are plenty long for field sports. If you shoot wildlife, you will appreciate the 300mm lens, and you might even want to add a teleconverter to it for longer reach. On the shorter end, if you already have the 18-55mm zoom, the 55-300 will fit right in. The NIKKOR 55-300mm sells for under $400, bearing in mind that it is a DX format lens, which is fine for the D40. If you think you might eventually upgrade your camera body, take a look at the NIKKOR 70-300mm lens. It is an FX format lens, which will work on any Nikon body, is the same aperture as the 55-300 and is only about $190 more than the NIKKOR 55-300mm. All of the lenses I am suggesting have Nikon's Vibration Ruduction (VR) built in which is good for 2-4 f/stops slower shutter speed when hand holding the lens. If you know that you will only be using a tripod for very long focal lengths Nikon does have an FX 70-300mm f/4-5.6 that sells for about $160. Caution, do not try to handhold that lens at 300mm at shutter speeds below 1/250 second, but that's what we all used to do. Still, I highly recommend the Vibration Reduction Lenses.

Will this lens autofocus with the D3100? I just had to return the 70-300mm Nikon lens because the autofocus wasn't compatible with the camera.

Any AF-S lens should work with your camera. This is due to the fact that AF-S lenses have a built-in motor. Since your camera has no motor, it requires these lenses for auto focus. Your 70-300 lens must not have been an AF-S.

Will this lens autofocus with the D3100?

Will this lens autofocus with the D5200?

Does the Auto Focus work on the D5100? I have read one site that it does not.

It works great for me. My guess is that someone got a lemon, and I'm sure they do exist. You can see photos I took with my D5100 at http://idaholyoaks4.blogspot.com/. There are lots of shots there I took with my D5100, as well as some I took with older cameras.

ASIN	B003ZSHNCC
Batteries	1 Lithium Ion batteries required.
Best Sellers Rank	#137 in SLR Camera Lenses
Customer Reviews	4.4 4.4 out of 5 stars (5,492)
Date First Available	August 17, 2010
Is Discontinued By Manufacturer	No
Item Weight	1.28 pounds
Item model number	2197
Manufacturer	Nikon
National Stock Number	6760-01-595-0589
Product Dimensions	4.84 x 3.03 x 3.03 inches

Nikon AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED Vibration Reduction Zoom Lens with Auto Focus for Nikon DSLR Cameras

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