A couple of years ago I purchased a tele rollei that actually belonged to a
man that used it shooting stills for Disney back in the 1960's. The
viewing lens is fine, but the taking lens has some separation that comes in
about 20 to 25%. I don't see yellowing, nor bubbles not crystallizing, but
just a clear separation. The son of the man that used it said it was in a
storage shed for about 5 years in Georgia - so hot. My understanding
is that could also cause the lens to separate - probably the humidity
didn't help either. I use it all the time for b&w and see no negative
affects at all. I can't speak to what others are experiencing, but that's
mine.
I didn't buy it as a collectible piece, but to use and it hasn't
disappointed. Attached is an image taken with it.
Hope this helps
On Wed, Feb 5, 2020 at 7:27 PM `Richard Knoppow <dickburk@xxxxxxxxxxxxx>
wrote:
I think Zeiss had some problems with cementing using
synthetic cements. Actually, there were several types of cements,
some heat curing, some with UV light. If the lens surfaces are
not absolutely clean and if the baking is not done correctly the
cement will separate with time.
Canada balsam usually separates because moisture penetrates
at the edges. That causes the balsam to crystalize. The usual
symptom is yellowing at the edges, which has little effect if it
does progress far. Eventually, the balsam crystalizes. Synthetic
cement seems to separate as large bubbles between the cemented
surfaces. Ruins the lenses. I don't know what causes this other
than faulty cementing. I have a Wollensak copy of a Zeiss
Convertible Protar where all the surfaces separated. I tried to
recement it but without success. I have also seen Kodak lenses
with bubbles. The only Schneider lenses I've seen with problems
were cemented with balsam and have the typical yellow ring. I
once saw a Contaflex kit at a camera show with four or five
lenses, all separated. What a shame.
It is possible to recement lenses but its important that
they be centered correctly. While some say that clamping the
edges is enough that probably does not suffice and is not
possible for some types of lens. A real centering machine is
needed. Its an expensive procedure, some lenses are worth it but
many are not.
On 2/5/2020 3:20 PM, wayne pinney wrote:
Wow! in pursuing Tele-Rolleis, I note that a significant number ofcameras being offered for sale have developed problems with lens
separation. I think it is more than my imagination. It seems like at least
half of owners indicate the problem with their camera.
of the camera being so collectible that only flawed cameras are offered for
Is this truly a bad problem with this model of camera, or is it a case
sale.
problem?, is it likely they will not develop problems with lens separation?
What about examples of the camera that have not yet developed the
of the cost of a nice F. Already shot a roll through it and really like it.
I bought a pristine example at a very reasonable price, about 60 or 70%
Wondering if there are some things I should do in storing and/or using it
to prevent the problem from cropping up.
Best,
Wayne---
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--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
---
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