One thought; if the lens works for you, have it multicoated by Arax (http://araxfoto.com/). I have had a few lenses coated by them, and have been very happy with the results. I have a number of 125+ year-old multi-coated lenses. One does of course risk destroying the lenses, but I have never had a problem.
Arax said:Polishing and Multi Coating, for each surface $15
ABOUT MULTI COATING SERVICE
For non coated lenses, ARAX company made custom Multi-Coating on ARSENAL factory. The sophisticated seven-layer dielectric coatings are vacuum-deposited on glass-to-air surfaces to reduce internal reflection, increase transmission efficiency and enhance contrast.
Leica, Carl Zeiss Jena, all other lenses could be polished and multi-coated for $30 for one glass independent from the lens size.
You should send the glass only without any metallic parts and rings.
We process only the glass elements which would be stripped out of the metal rings and other containers that hold them in place in the lenses. We could clean the old glue off the partially separated lenses, clean off old surface coating, then re-coat and re-glue the lenses, package them, and return them. In other words, we would not even have to deal with replacing broken parts of the lenses; only with the optical elements themselves.
We don't want to risk to brake lenses from metallic rings. And we not like to unglue the glasses from each other because of risk of damaging. The point is that we want to minimize the damaging risk. Anyway you should know that along processing, lens damaging possible and we can not take full responsible for that.
I've mounted this lens on the 14x17 and by f/16 the corners appear fully illuminated. Since I've not made any exposures with it, I can't speak to the quality or to the amount of coverage it might ultimately afford. But it does cover. 7x17 should be no problem.
...So, did you remove your elements from their barrels prior to ending them to Arax, or did you send the complete lens, barrel and all? If you removed them, did you do it youself? And, if so, how did you keep track of the order and direction of the elements and how did you reassemble the lenses to make sure they were properly collimated?nts are just held in place with threaded retainers - not "spun in" like some newer lenses...
Kerry,
One thought; if the lens works for you, have it multicoated by Arax (http://araxfoto.com/). I have had a few lenses coated by them, and have been very happy with the results. I have a number of 125+ year-old multi-coated lenses. One does of course risk destroying the lenses, but I have never had a problem.
best regards,
jason
Now with a lens like a Gauss which has a number of seemingly identical elements it may be more difficult. You may need to label the glass somehow, perhaps etching a number into the side of the elements?
Jason,
Thanks for the response. Since the elements are so similar, I'm afraid of getting them back together improperly and reducing the performance of the reasassembled lens. No point paying someone to multicoat the elements only to destroy the performance by putting it all back together incorrectly.
I'd really like to try this with my 8" Series VIIB, but don't want to do the disassembly/reassembly myself. It looks easy enough to get apart, it's the putting back togther that has me worried.
So, can anyone recommend a qualified technician to disassemble my lens and reassemble it properly after the elements are returned from Arax. I see from the SK Grimes web site that they no longer recement lenses. Of course, the Cooke is an air-spaced design, so there would be no cement involved, but I wonder if this means the folks at SK Grimes are totally out of the optical repair/assembly business and are now exclusively a mechanical shop. Any other recommendations?
Kerry
Jason,
Could you send them one at a time? Slow but sure to keep track.
Bill
Thanks for the response. Since the elements are so similar, I'm afraid of getting them back together improperly and reducing the performance of the reasassembled lens. No point paying someone to multicoat the elements only to destroy the performance by putting it all back together incorrectly.
Do let us know how the lens works out!
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