Originally posted by Fenwoodian .
I'm currently working on a project that requires me to shoot a mirror lens. I have not shot one in over 40 years.
I recently purchased a used, like-new 500mm f/8 Kalimar mirror lens. When I put it on my K-1, the shake reduction (SR) went wild, with the sensor constantly dancing and chattering all over the place - even though I was not significantly moving the camera.
At first I thought that there was something wrong with the lens. But when I put other normal and short telephoto lenses on the K-1, the SR returned to working normally.
Then I tried a little experiment. I tested a 35mm lens, then a 50mm, then a 90mm, and finally a 180mm. In each case I had SR on and was gently holding the camera. Well, I noticed that with each longer lens I put on the K-1, that I could hear/feel the sensor moving to a greater and greater extent. So, I figured that with a really long lens like a 500mm on, the SR would move the sensor much more to compensation for the same degree of camera movement. If that's true, I believe that in the future I'll only use the mirror lens with the SR off in order to prevent from "overstressing" the sensor movement mechanism.
Does this make any sense? Have you experienced this yourself? Or is it something about mirrorlenses themselves that make SR mechanisms go nuts?
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Don't think it has a thing to do with being a mirror lens. The SR doesn't know what type of lens it is. It doesn't even know the focal length unless the lens supplies the info via electrical contacts.
I wouldn't worry about wearing the SR out. It is magnetically actuated similar to a speaker. Look at how long it takes to wear out a speaker.
Thanks,
barondla