Compabilty Nikon 70-300mm/f1:4-5.6G with KENKO 2 X TELECONVERTER MC4DG

Model 1919.

You can order the Tamron 2x teleconverter here. Be aware that not all lenses are compatible with teleconverters, and you can actually damage some lenses by trying to use them with a teleconverter.

The sensor on the D80 is smaller than a piece of 35mm film. This means the camera will only use the center portion of the image cast by the lens. This reduces the angle of view, effectively increasing the focal length. The 35-70mm will give you an angle of view similar to a 52-105mm lens on a film camera. Likewise the 70-210mm lens will give you an angle of view similar to a 105-315mm lens.

Teleconverter loses maximum lens speed.
With 2X teleconverter, your 90mm-300mm f4.5~5.6 will become something like f8~f11. Most SLR AF cameras need maximum aperture of f5.6 to autofocus so by using the 2X teleconverter on this zoom lens, it will not autofocus, because the lens's light gathering became too low.
Here is more information about using teleconverters.
http://tinyurl.com/29s5osk

Glad you got it fixed :-)

If it's an AF teleconverter you will be able to use it and get proper exposure from the camera, but it will not autofocus with the D60. The D60 requires AF-S lenses and teleconverters for autofocus.

If the vivitar 2x is not autofocus, then you will obviously give up 90% of the cameras focus, metering and flash functions. All 2x lenses loose 2 stops of light so the f2.8 lens will now be f 8. If that is acceptable then it may be worth the few dollars to get double the power for the lens

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

The D40 will only autofocus with the Nikkor AF-S lens...look for the AF-S in the lens title. For 3rd party lens, only SIGMA with the USM title will autofocus.

To use the T-adaptor...you will need to use the "Manual" mode of the camera.

Kenko has several through Adorama.com that should still let you use AF and VR (I and II).