According to Wiki Canada balsam was phased out as an optical cement
during the second world war. Whatever has failed must certainly be
something different.
Chuck Norcutt
JOHN DUGGAN wrote:
> Optical Instruments (Balham) have given me a ballpark figure of £60.00/$90.00
> to separate and re-cement the front doublet to M.O.D. specifications.
> The elements themselves are pristine, and re-assembly is very
> straightforward. So this is my back up option.
>
> I am STILL trying to get a definitive answer from Tokina UK (Kenro) as to
> whether the font element is still available from Japan, and if so will they
> sell me one - and at what cost. They do not seem particularly helpful.
> I suppose there is not a lot of profit in it for Tokina UK if I do the repair
> myself.
> At least I can see a way forward.
>
> One possible contributing factor towards the element separation is that
> running under the area where the camera bag had been placed central heating
> pipes run. The floor at that point gets "warm" not hot. I wonder if that
> could have softened the Balsam?
> However, to counter that theory, the edge of the element is still sticky four
> days after dismantling it so perhaps it is just natural breakdown of the
> cement.
>
> Regards
> John Duggan,
> Wales, UK
>
>
>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|