I have a Nikon D3100 and want to buy a zoom lens 70-300.Please help I am confused is a Nikon AF Zoom-Nikkor 70-300mm f/4-5.6G compatible? And is it automatic focus?

Do you have a lens collimator and other equipment needed to reassemble the lens properly? Otherwise you may as well disassemble it with a sledgehammer---it'll work just as well afterwards.

I'm not questioning your ability, but your equipment. Would you rebuild a car engine using the tools in your kitchen? Would you service a flat-screen television using the automotive tools in your garage? A camera lens is a precision piece of equipment, requiring its own specialized tools.

No Nikon lens ever zooms automatically, so I assume you mean focus.
The D5100 lacks an autofocus motor, requiring the lens to have one. The older 70-300mm lenses lack this motor, expecting the camera body to have one.
The D5100 will only autofocus with lenses designated AF-S or AF-I. It will not autofocus with older AF-D and AF-G lenses.

Hello marion.... Rutn the camera on and open up the menu. Find the reset function and reset the camera. All that does is reset it to the factory settings, the settings it had when you first took it out of the box. In most instances this will fix the problem. If it does, great. If not, take it or send it into a Nikon repair shop. Opening it up your self will void the warranty. Joe

thanks for choosing Fixya!

generally when a zoom extends to max, it defaults to a higher aperture number - which means a smaller hole that lets in less light. The auto settings then increase the ISO (light sensitivity) to compensate. If you hit the high end of the ISO for your camera, you get grainy photos.

Try the same 'full zoom' on a bright day - and you should see the difference. The ultimate cure? Stick to brighter situations or spend money on a body with a higher ISO sensitivity or a lens with a fixed aperture. The least expensive approach is to shoot in situations with more light.

Any Nikon digital SLR will work with this lens. However, there are two things to consider.

On cameras other than the D700 and the D3 family, the smaller sensor will make the lens appear as a 105-315mm. On the D40, D40x, D60, D3000, D3100, and D5000 cameras, you will lose the autofocus capability.

Seems as if you're snapping the shutter before the lens has focused. Have you tried manual focus or single-server auto focus?

Your motor may have gone bad. Try sending it to PhotoTech Repair Service in NYC. They are Nikon authorized, and can do the repair under warranty if you still have it. Also if you join they're facebook page, they will give you a 10% discount.
Here is the facebook page link, it has everything you need to send it in.
http://www.facebook.com/pages/New-York-NY/PhotoTech-Repair-Service-Inc/102527215194

First thing: Don't try to zoom it at all anymore. The mechanism inside is broken or somehow disconnected, and you can make it worse by trying. Please take it in for repairs as a camera pro will need to look at it.

A D type is mostley a nikon fit lens Dl stands for Delux type

Here is Nikon's specs of lens compatibility for the D40X:


Compatible Lenses*: Nikon F mount with AF coupling and AF contacts Type G or D AF Nikkor:
1) AF-S, AF-I: All functions supported;
2) Other Type G or D AF Nikkor: All functions supported except autofocus
3) PC Micro-Nikkor 85mm f/2.8D: Can only be used in mode M; all other functions supported except autofocus
4) Other AF Nikkor*â¹/AI-P Nikkor: All functions supported except autofocus and 3D Color Matrix Metering II
5) Non-CPU: Can be used in mode M, but exposure meter does not function; electronic range finder can be used if maximum aperture is f/5.6 or faster
6) IX Nikkor lenses cannot be used
*â¹ Excluding lenses for F3AF

They do not recommend 3rd party lenses, ever