[rollei_list] Re: ...Rollei lenses

  • From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
  • To: rollei_list@xxxxxxxxxxxxx
  • Date: Fri, 16 Jan 2009 00:32:36 -0800 (PST)

--- El jue 15-ene-09, Emmanuel Bigler <Emmanuel.Bigler@xxxxxxxx> escribió:

>> ...Users of pre-war rollei TLR with un-coated lenses usually
> notice (and complain about) a blue cast in their images.
> This blue cast seems to be corrected in coated lenses of the
> fifities and the sixties.

Rollei manuals and catalogs from the fifties and sixties recommended to use a 
special Rollei UV filter for coated Tessars and Xenars to shoot color film, 
this special filter was not required for the five elements Planar and Xenotar 
shooting at normal conditions. It looks like color films had not good UV rays 
filtering and Tessar and Xenar lenses were UV rays sensitive too much. Modern 
color emulsions, even if they don't have a specific UV filter layer, improved 
their answer to different colors diminishing UV rays sensitivity and then that 
special Rollei filter is no longer necessary for Tessars and Xenars.

It could be interesting to recall that ending the sixties and beginning the 
seventies, the original Rollei 35 Tessar lens received complaints from the 
firsts users due to its UV rays high sensitivity, Zeiss solved the problem 
using a special cement that filters the UV rays, this fact is commented by 
Claus prochnow in the book "Rollei 35, a camera history".

Carlos 



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