p.18 #2 · Official: Voigtlander 35 F1.7 Ultron M mount
mapgraphs wrote:
This is the more plausible explanation.
The original LTM came in at least two cosmetic variants, with differences in the knurling on the focus ring. There was a claim that the so-called later version wasn't prone to the problem with the cement deteriorating (haze) but subsequent observations suggest that all of the LTM versions can exhibit haze.
It also appears that some copies do not have an issue with the cement. I have both versions, one has haze the other is clean. It may be an issue of batches, some used better cement, most didn't. Excellent lens though, even with haze....Show more →
I believe cement deteriorating (haze) is the issue and it seems to be common with all the ltm 35mm f1.7 after a certain age. are you saying you have both versions of the ltm? I am curious if there is anyone here who has the ltm version that does not have this issue. Some of the older 40mm f2 ultrons (Ultron 40mm f/2 SL (2002–2003)) have this issue too.
After more testing the haze flaring is a major issue, noticeable even in indirect light on bright objects. All reflective objects have a heavy hazy glow around them as if i were using a 1/2 or 1/1 diffusion filter. I suppose I could relegate it to being my "character lens". Also the 0.9m MFD limits its usage heavily. I would generally avoid the ltm (L39) version of this lens unless you can return it easily or inspect before buying.
p.18 #3 · Official: Voigtlander 35 F1.7 Ultron M mount
I think a lot of the Voigtländer LTM lenses from this general era have haze. For example the 35mm 2.5 Color-Skopar often has haze (I looked for six months to find one without haze and it has remained haze-free so far). I thought it was due to offgassing oil/grease but maybe it's from deteriorating cement, but it does seem to be a common affliction of older Voigtländer LTM lenses.
