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Lens group separation
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PostPosted: Mon Sep 19, 2011 7:37 pm    Post subject: Lens group separation Reply with quote
Just got a Rodenstock Rodagon 210mm F/5.6 lens.

Sellers description:
Quote:
Cosmetically, there are clear signs that it has been used, but only in the paintwork, there are noo dinks or dents andit is mechanically as tight and precise as the day I bought it. Optically, it is in truly excellent condition.


I am a realist and did not really expect it to be in truly excellent condition, but was a little shocked by this







and as view through from lens rear



The photos are taken at with just the right angle of light to highlight the problem, viewed normally the effect is not quite so obvious.

I suspect this is caused by partial separation/cement failure between the two elements in the lens group at front of lens.

How do you think this will impact on results from the lens 1. as an enlarging lens 2. as a DSLR camera lens?

PS Taken on 40D with Tamron SP 90mm


PostPosted: Mon Sep 19, 2011 8:15 pm    Post subject: Reply with quote
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Last edited by Pancolart on Sun May 06, 2012 12:13 am; edited 1 time in total


PostPosted: Mon Sep 19, 2011 10:14 pm    Post subject: Reply with quote
Don't ask us how well the lens will perform for you, ask the lens.

FWIW, I have a 58/5.6 Grandagon with rings of fire in front and rear cells. I've shot it on my 2x3 Graphics, found it usable. There's a hint.

Rodenstock and Voigtlaender both used the wrong cement for a number of years. Lenses from both houses made in the late '60s are often badly separated.
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