I have been busy the last few weeks. The weblog took a hit as a result, as well as my documentation of websites I have visited.

• Roberts built a nice webpage dedicated to the Vivitar Series 1 70-210mm zoom lenses. It is definitely worth keeping around for review if you are a user of manual focus lenses. Vivitar made lenses for a wide range of cameras. I have a few of them.
• I know I have posted the link to the Tamron Adaptall-2 webpages before. But, this is such a good resource that it bears repeating.
• It turns out the Olympus OM-3 and OM-4 bodies have a small physical sensor on the lens mount to detect when the lens is removed and force a reset of the spot metering system. Tamron redesigned the Olympus OM mount to prevent damage to this sensor and labelled it OL, replacing the original OM designation, at least on later versions of the mount. Documentation is here.
• My buddy sent me contact information for a couple of watch makers, Watch Tech and Watch Doctor.
• Like all of the professional cameras, Olympus offered interchangeable focusing screens for their OM-series bodies. This link is a list of them and what they offer.