[Leica] A42 M Polarizer #13351 fits many other brands

[marcsmall at comcast.net (Marc James Small)]

At 05:13 PM 10/27/2007, Didier Ludwig wrote:
 >Just noticed that the #13351 Leica Polarizer also fits on the
 >Helios-103 1.8/50 (Contax-mount), Petri Color 35 (though causing heavy
 >finder intrusion), and likely many other lenses with 40.5mm filter
 >thread. The Jupiter-3 aperture ring gets almost blocked (but who uses
 >this lens other than wide open?:-) With the LTM 2/35 Canon (40mm
 >filter size), the aperture ring is movable but a bit difficult to
 >handle. Even the 28mm Color Skopar takes it (recommended for use on
 >R-D1 only because of vignetting), I can assume the 35 classic and 50
 >Skopars also take it.

Didier

The standard Contax RF filter size was S40.5 
(E40.5 in Leitzspeak), that is, a screw-in thread 
of 40.5mm in width.  The standard Leitz filter 
size was E39 (S39 in Zeissspeak), that is, a 
screw-in thread of 39mm in width.  But both Zeiss 
and Leitz used A42 push-on filters -- that is, a 
push-on fitment 42mm in width.  So, an A42 
Contapol will work on E39 Leitz/Leica lenses, and 
a Leitz/Leica A42 polascreen will work on a Zeiss 
S40.5 lens.  The Jupiters in both Contax and LTM 
followed the CZJ sizes, as did the Helios.

Marc


msmall@aya.yale.edu
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