Variable Optimization on sonnar zm

elmer3.5

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4:28 PM
Joined
Apr 7, 2009
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Hi, few weeks ago got a ZM sonnar 50mm, great optics.

Very happy with it, but not completely.

After a while i decided i wouldn´t learn how compensate back focus on samller apertures.

So decided to make a system to optimize the lens from 1.5 to 2.8 in a simple fast manner.

So today i did it, took away one shimm from the rear element housing and left only two! That sets automatically to 2.8 opt.
Then to go back to 1.5, I unscrew only 90º (CCW) the rear element
That way i get perfect focus in either configuration, very simple, fast and reliable. Only a small move with the fingernail. fast as changing one lens to another!

Bye!
 
Hi, not yet, but guess it´s necessary to realize it´s not that difficult.
i´ll try to post it on this week!

Cheers!
 
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