Originally Posted by
arri
Thank you for your explanation Dan.
A few lenses are risky to use, exspecially the Focotar but it has a M39 mount an I already have had an Exakta/M39 ring, so I can use a lot of other enlarging lenses.
A 50mm lens covers 4x5" at ration 3:1 and maybe it will be better to reverse it.
The Steinheil is a 100% symmetrical four element dialyt lens, like the Apo Ronar, It will be interessting to use it.
The Summar is a coated lens and with good optical quality.
The S-Tessar is a very interesting lens, it has two identic threads, it can be use in the range of oo-1:3 in the same way like a standard Tessar, the f/6.3 versions are wide angle lenses with nearly 60° angle of view. I guess it covers the 9x12cm format at oo, 4x5" maybe but I want to check it.
When the lens should be use in the range between 1:3-3:1 the lens can be turned and it is a reversed Tessar. The lens has two aperture scales for it.
Rodenstock use the same way with their Apo Macro Sironar lenses.
My S-Tessar were made in the late 1930th but it is one of the very early T coated lenses.
I have three Tominon lenses in stock and I want to test it as well, the f/4.5 in 75, 105 and 135 focus length.
Also I want to test an Elgeet Colorstigmat 4.5/135mm. A very solid made lens, it has excellent optical quality in normal photographic work, maybe it will be great for macro as well when used in reversed position.
The dark winter days are the best time to test lenses and make adapters and othe "crasy" things.
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