[rollei_list] Re: Lens coatings and veiling flare.

Rollei TLR were provided with simple lens coating from 1949, during the TLR 
regular production up to 1981 the TLR lenses had not multicoating layers, only 
the Zeiss double layer coating; in 1972 Rollei considered multicoating lenses 
expensive too much for the TLR and unnecessary due to the four and five 
elements lenses, since Carl Zeiss would produce multicoated normal lenses, 
Rollei only used Schneider  Xenotar and Xenar for the TLR from 1972/73. The 
only Rolleiflex F provided with multicoated lenses was the F Platin, Planar 
lens 2.8/80 HFT (actually it's a Zeiss T* multicoating made by Zeiss, it was 
used "HFT" name for commercial issues and the agreements between Rollei and CZ 
by that time), this Planar was used for the GX/FX afterwards, it was made from 
the scratch by Zeiss 'cause they no longer had the tooling to manufacture the 
TLR Planar.

The main problem about flare under the situations mentioned below is the lens 
and camera age and their condition; light seals, black paint, light trap 
adjustments and conditions suffer the aging situation even if well maintained, 
anyway I have several samples taken with the 2.8C, 3.5F and 'cord IV where in 
similar situations and despite the subtropical sun I don't get flare or if I 
get it, it is maintained within reasonable limits, however I got once or twice 
ugly flare due to the special angle sun-lens.

I'm convinced due to some tests that for old cameras like our TLRs, the f/stop 
has a significant influence to control the flare in the situations referred 
below, it could do a noticeable difference, I always try to shoot at f 5.6 and 
smaller f stops for backlit and similars, Avedon shot at f8 with the TLR in 
general. If my memory serves me good, you tend to shoot lens wide open or close 
to wide open, perhaps it has to do with the flare and rollers reflection 
problems.

Carlos

--- El mar 7-jul-09, Sanders McNew <sanders@xxxxxxxxx> escribió:

> I shoot a variety of older
> Rolleiflexes --
> a 3.5E and a 2.8C getting most of the
> work.  Their weakness, in my use, has
> always been veiling flare when shooting
> a strongly backlit subject, or in other
> conditions where the sun or a bright
> reflection is in the frame.
> 
> Does anyone onlist know when F+H
> or its lens suppliers upgraded the lens
> coatings on the TLRs?  Are later TLR
> models more effective at suppressing
> veiling flare in these conditions?  Do
> I need to ask Austin for his GX to tame
> this beast?
> 
> Sanders
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