Nikon/Sigma/Extension Tube Problems

Thompson · Jul 30, 2008

I have a Nikon D300 with a Sigma 18-200MM AF lens, both new, but I wanted to get a little closer to my subjects, so I bought a Nikon 12MM extension tube. I got the desired results as far as magnification goes, but now the camera won't adjust the lens' aperture, and all my pictures are completely dark. I don't care about the autofocus, I don't use that much anyway, but any ideas on how to get the aperture working again would be very much appreciated.

Bifurcator · Jul 30, 2008

Use a good AC Close-Up lens = problem solved.

Others may know more.

Tolyk · Jul 31, 2008

As far as I'm aware, the Sigma lenses require the Sigma extension tubes (likewise when trying to use teleconverters)

The Nikon one may just be slightly incompatible with the Sigma lens. Odd, I know, since it's built for the nikon mount and all.. but you may want to research that.

Bifurcator · Jul 31, 2008

Yeah, there are two types... One type with the electrical contact pass-throughs and one type without. Someone here on TPF recently discussed this. They even knew the proper terms for both.

Helen B · Jul 31, 2008

Bifurcator is on to it. I'm guessing that the Sigma lens is like Nikon 'G' lenses - there is no aperture control ring on the lens itself.

There are Kenko auto extension tubes that have the contacts for aperture operation. The Nikon ones don't.

Best,
Helen