    
rick
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 16, 2004 - 07:17 pm: | 
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I picked this up a week or two ago in a used-camera store for $5.
It's a 135/2.8, M42 with auto diaphragm, with an auto/manual ring just aft
of the f/stop ring. The construction seems very unusual:
- the focus is a single helical, so the front end of the lens rotates
as you focus.
- Stranger, the entire lens (which appears to be 4 air-spaced
elements) is located in FRONT of the diaphragm, rather than having
the diaphragm between the elements.
- Stranger still, the diaphragm is mounted in the rear half of the
lens barrel so it does not move during focusing; thus the distance
from the diaphragm to the lens varies as you focus.
- There is a 5th piece of glass, just a flat plate, located behind
the diaphragm - i assume to protect it from dirt and damage since
there's no lens back there.
Is anybody familiar with this lens, or others similar to it?
rick  = |
