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Sankor (Mayfair, SeriesE, F.B.R. etc...) t-mount 105mm f2.4/2.5
Latest Review Posted Tamron Adaptall Pentax P-KA auto aperture mount
The first thing is: if you are using adaptall lenses then pretty much you do want one of these. These PKA mounts turn your adaptall lenses into the equivalent of Pentax SMC-A lenses. The most important benefit: on the fly metering in auto Av, Sv, P or Tv modes, no need to press a green button, spin a dial, chimp or guess. And the additional conveniences of aperture adjust using the on-camera dial, aperture data recorded in EXIF. However these mounts aren't straightforward. The first thing is that everything has to be correct for the mount to function in auto modes in the first place. Mount correctly engaged and clicked in on the lens. Note that on occasion you may need to press the wee black button on the mount rim to free up the movement of the ears. Ears correctly engaged in the spaces on the aperture ring. Note that slightly bent ears (quite common with used mounts) may not click into place, and can easily move out of position. Lens aperture ring properly clicked in to AE/F32 position. Problem? check #1, #2. Electrical connection good - see "mount not working" in description above. Wiggling and fiddling a bit is commonly required. But usually once the f numbers are displayed on both the rear and top lcd's (must be both), you are good to go. And once you have a functioning mount, then the bug is inconsistent exposure results across the f-stop range. This is a bad one:

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