Jens Bladt wrote: > Sat, 22 Jan 2005 02:32:09 -0800 > Do any of you know which Adaptall mount I should look for, if I want to se > a Tamron lens that will allow for using shutter priority or programed AE on > a "A"-series body, perhaps even on the *ist D (provided I use a "A-series > Tamron lens")?
> It seems there are more than one Adaptall 2 mount (R1 and ...?) > All the best > Jens Bladt I have an Adaptall-2 which works fine in AE mode with a Tamron SP 1:5.6 300mm Tele Macro BBAR MC Model 54 lens on MZ-5N, MZ-7 and SuperProgram bodies. The lens body has an aperture setting labelled 'AE' which is linked by underline to the "32" aperture setting. I purchased the adapter new about three years ago, and I still have the box and owner's manual (sheet of paper, really). To quote the Adaptall-2 manual "...due to limitations of Pentax cameras, the minimum aperture of F/32 cannot be used even if your lens has this minimum aperture", and "The position of F/32 serves as AE". The adapter's box is labelled "ADAPTALL-2 CUSTOM MOUNT MONTURE ADAPTALL 2" on all six sides, and it additionally says "for Tamron MF Lenses" on the front and back of the box. The only place where it mentions Pentax is on the top flap in the UPC area, where it says "O2C PENTAX-K". The "O2C" designation may be important, but I don't know. The adapter itself is only labelled "TAMRON", "P/KA" and "JAPAN", with the these three labels on different parts of the adapter base plate, which contacts the camera mount when the lens is on the body. The base plate also has three "button" electrical contacts which mate with the body's AE lens interface. These electrical contacts are not visible on the inside face of the adapter, which goes "in" the lens body, but you can see a small circuit board with spring-clip electrical contacts just inside this inside face of the adapter. This circuit board is a slim arc of an annulus which spans about 1/4 or 90deg of the inner circumference. In order to activate the AE aperture control, you have to depress the small black tab at about 7 o'clock on the adapter, in the same way as you have to push the little button on an -A or newer Pentax lens. When the lens is mounted, this AE tab is horizontally opposite from the K-mount release button on the body. I have found that it is possible to mount the adapter so that manual aperture control works, but AE does not. I think the key (besides depressing the little tab), is to ensure that the other flatter and wider tabs are fully rotated clockwise when looking at the base of the adapter. Generally, I mount it and rotate things until it all works. BTW, the adapter is FS - contact me through my web site if want more info. Jim www.jcolwell.ca
