http://www.nikonchat.com/nikon-35mm-f2/
Extension tube for Nikon D90-S AF lenses?
I have Nikon AF-S DX nikkor 18-105mm f/3.5-5.6G ED VR AF-S DX Nikon 35mm F1.8G Sigma 70-200mm lens F2.8 EX DG Macro HSM II Objective I have these three objectives, I'm thinking of buying an extension tube is Kenko Automatic Extension Tube DG Macro AF – Nikon this tube will be fine for my DSLR? thanking you
While Kenko rings do not have electrical contacts that give autofocus, extension rings to reduce the amount of light reaching the sensor. Beyond a certain point, you will lose auto focus, they do not have enough light for the AF system work. A large number of cameras will not autofocus if you have less light than the equivalent of reaching the sensor F5.6 AF. So yes, the rings Kenko AF, but you probably want use with your Sigma and 35.
Nikon 35mm f/2 focus NOISE problem
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