I realize I have been asking a fair number of questions lately but where else can you get such expert help? So here goes another one: Do any of you know if you can use an older Tamron lens, specifically a Tamron manual focus 90mm f2.5 macro, on a Nikon F-100 body? I have one and love the lens but I have tried it on the F-100 with an Adaptall II Nikon-AI-E mount and it does not work. It mounts on the body ok, but I can not control the exposure at all. Do I have the wrong Adaptall adapter, or is this lens just too old to be used on the F-100? Thanks again, Glenn

-- Glenn (swan@ampex.com), March 19, 1999

Answers

I've never seen an F100 and I've never used and Adaptall II AI-E mount, but in theory it should work in full-manual or aperture priority mode with spot or center-weighted metering. You'll also have to set the aperture on the lens.

If you can't get this much, which features are you missing?

-- Geoffrey S. Kane (grendel@pgh.nauticom.net), March 19, 1999.

Thanks again for the reply. I didn't realize that I would have to set the aperture with the ring on the lens. The Tamron lens seems to work fine in the Aperture priority mode, setting the f-stop on the lens. Interesting note: I called Nikon technical support and the guy I talked to said he didn't know anything about Tamron's Adaptall 2 mounts. He said he had never heard of them, and said he would not put one on a F-100. Of course, what else would he say. Thanks again for the help, Glenn

-- Glenn (swan@ampex.com), March 21, 1999.

U will not be able adjust the aperture using the aperture dial of the F100 because the Tamron is a Manual focus lens that does not have the necessary CPU and contacts to transmit info to the camera. U can however - as U already have found - is use the aperture ring of the lens to change aperture settings - because the F100 has an Ai(Automatic Indexing) tab on the mount. Matrix metering is not available with Manual Focus lenses in all modes - only Center-Weighted and Spot.

-- Shannon (shong@nospamlhc.qld.edu.au), March 25, 1999.