Sigma lens error message aperture ring

SOURCE: AF not working on Nikon D80

release the lens at smallest aperture then reattach....

SOURCE: Fitting a Sigma Lenset to Nikon D40

You have to make sure you bought the sigma lens with a NIKON mount. Sigma makes a Sigma mount as well as a Canon mount, of course neither of those mounts will work with your camera. Also you must also make sure your lens is the Sigma 70-300 HSM (/Hyper Sonic Motor) or it will not AF on the D40. I just bought this lens from Abes of Maine and I love it on my D40.

SOURCE: sigma 18-300mm lens

The problem may be with the sigma's aperture ring. Try this:

- Turn camera off
- Turn the aperture ring clockwise and lock it
- Turn camera on

If this does not solve the problem, do it again but turn it counter-clockwise

Testimonial: "thanks for the advice camera now back in working order. thanks again."

SOURCE: hi i have a nicon d70 it was working fine when

Have you tried formating the memory card? R07 means it has 7 shots in internal memory. Since you have already pressed the reset through the small hole in the front, if formatting the card does not work, try downloading the latest firmware from Nikon and installing it.

Testimonial: "thank's for your quick reply, i'v reformated and installed latest firmware still noththing as i say it was fine till i changed len's, Cheers Bob"

SOURCE: Message: Lock lens aperture ring at

You must lock the aperture ring to f/22, so the camera can engage the aperture adjustment lever on the lens. Then, you can change the aperture with the command wheel.

When you change the aperture with the command wheel the aperture ring on the lens doesn't move when the camera actually adjusts the lens aperture.

Take the lens off and locate the aperture adjustment lever on the lens mount.

Unfortunately, this won't work with older AF lenses. So if you are using an older lens, the only thing you can do is change the camera setting to M (Manual) to adjust the aperture on the lens yourself.