cyberjunkie
21-Apr-2011, 00:10
I am looking for some french lens expert.
I found a Derogy Ortho Periscope lens of about 450mm focal. The lens is not very big, but the diameter of the front lens is more than 7cm. There is a slot for waterhouse stops.
I have been looking for informations for a while, but i found almost nothing on the web.
Even the VadeMecum barely reports the existence of the lens (no focal lengths, no optical scheme).
I know what a "periscopic" lens is, but i guess that the word was used by different makers, and maybe in different contexts.
If somebody knows the optic, is it of some interest only as a collector's item?
I mean, is it just another rapid rectilinear look-alike, or does it have a peculiar photographic signature?
Unfortunately there is very little documentation about french LF lenses.
There is an exception: the line of Boyer products, with the very informative web pages by Bertrando/Fromm.
Then there is something about Berthiot and Krauss (that was a Zeiss licensee), but when i tried to find something about smaller brands, i found very little. Sometimes the VadeMecum comes to the rescue, but i found very little, when i looked for infos about Roussel lenses.
It's a true pity. The Roussel example i own, a 210mm f/4.5 Stylor, is of very high craftmanship. The quality of the barrel is more than good, with two protruding pins on the diaphragm ring (in the fashion of an Universal Heliar), with a perfectly circular iris hole, and with an overall feeling of a superior build/assembly level.
Maybe it will perform very poorly... who knows. I have just cleaned the lens, so i had no time to perform any test.
But i have been very impressed when i had to disassemble the objective for cleaning. No hype, but it's not just another anonymous Tessar clone for mass production.
Now i see french vintage lenses with a lot more interest. For example i have just seen a big Krauss Tessar on the bay. From the pictures it looks very well made as well.
Then i saw the Derogy... and i came here for advice :)
have fun
CJ
I found a Derogy Ortho Periscope lens of about 450mm focal. The lens is not very big, but the diameter of the front lens is more than 7cm. There is a slot for waterhouse stops.
I have been looking for informations for a while, but i found almost nothing on the web.
Even the VadeMecum barely reports the existence of the lens (no focal lengths, no optical scheme).
I know what a "periscopic" lens is, but i guess that the word was used by different makers, and maybe in different contexts.
If somebody knows the optic, is it of some interest only as a collector's item?
I mean, is it just another rapid rectilinear look-alike, or does it have a peculiar photographic signature?
Unfortunately there is very little documentation about french LF lenses.
There is an exception: the line of Boyer products, with the very informative web pages by Bertrando/Fromm.
Then there is something about Berthiot and Krauss (that was a Zeiss licensee), but when i tried to find something about smaller brands, i found very little. Sometimes the VadeMecum comes to the rescue, but i found very little, when i looked for infos about Roussel lenses.
It's a true pity. The Roussel example i own, a 210mm f/4.5 Stylor, is of very high craftmanship. The quality of the barrel is more than good, with two protruding pins on the diaphragm ring (in the fashion of an Universal Heliar), with a perfectly circular iris hole, and with an overall feeling of a superior build/assembly level.
Maybe it will perform very poorly... who knows. I have just cleaned the lens, so i had no time to perform any test.
But i have been very impressed when i had to disassemble the objective for cleaning. No hype, but it's not just another anonymous Tessar clone for mass production.
Now i see french vintage lenses with a lot more interest. For example i have just seen a big Krauss Tessar on the bay. From the pictures it looks very well made as well.
Then i saw the Derogy... and i came here for advice :)
have fun
CJ