Jon Pop Posted September 2, 2011 Share #1 Posted September 2, 2011 Advertisement (gone after registration) Hi everyone: I have a 90mm Elmar C f4 which I like quite a bit (yes, I know it's not the thin Tele Elmarit, and it's only f4...but hey the WATE is only f4 too). The optics are pretty good on it, but I have noticed just a very slight hint of fogging inside the rearmost element (very slight). I'm not bad with delicate repairs, but naturally I'm not going to be silly about trying something myself that's way out of my league. Given that tele lenses are often pretty simple in their construction (i.e. few elements), is this something anyone has done themselves? It's more a matter of convenience - I'm not trying to save a few bucks, rather just don't want to send the lens off for an eternity, shipping costs, customs hassles, etc. I don't believe the rearmost element of the Elmar C was cemented, but I may be wrong, having not seen an optical diagram of the lens layout. And it's a long way from the aperture assembly which is something I'd never even attempt to approach. Has anyone out there attempted this sort of thing before, and if so, do you have any advice regarding disassembly, choice of cleaning solutions/cloths, and reassembly? Again, if it wasn't an older, inexpensive lens, I'd never even ask this question, so don't respond with the "only a fool would try to fix his own lens" feedback - I'd never even think about this with any Summicron or Elmarit ASPH for example. I've always sent my expensive, complex glass to places with expertise (DAG, Krauter, Kindermann, Lazari, etc). Thanks everyone! Jon Link to post Share on other sites More sharing options...
Advertisement Posted September 2, 2011 Posted September 2, 2011 Hi Jon Pop, Take a look here 90mm Elmar C - Self Repair?. I'm sure you'll find what you were looking for!
luigi bertolotti Posted September 2, 2011 Share #2 Posted September 2, 2011 I can give you a partial answer : the back element of the Elmar C 90 is a single one so if you can reach it, both surfaces are reachable; also, the element has a decent thickness, differently from the late Tele Elmarit 2,8's one, similar construction, which is very very thin and delicate. But I don't know if DIY disassembly is an easy task, sorry... given that lens' schema is 3 front elements / diaphragm / 1 back element could be that the front assembly is someway removable from the focusing+bayonet subassembly, giving a decent access to the surface to be cleaned... but I haven't idea if is really this way... never tried with mine. If you have been in relation with labs like DAG, could be that one of them can answer you about. Link to post Share on other sites More sharing options...
Jon Pop Posted September 3, 2011 Author Share #3 Posted September 3, 2011 Thanks Luigi! I may check with DAG or similar. Anyone else out there have any insights? Someone must have tried this type of thing before... Jon Link to post Share on other sites More sharing options...
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