cd - That sounds like a very good explanation of the two rows of size number digits.
The Series VI 1:7.7 also has the double columns of size - with a 4a, too!
But here the sets don't match - 4a is the same as the plain size 6!
cd - That sounds like a very good explanation of the two rows of size number digits.
The Series VI 1:7.7 also has the double columns of size - with a 4a, too!
But here the sets don't match - 4a is the same as the plain size 6!
Hi Steven,
My understanding of the numbering in Prochnow's book is:
first column: his numbering of lenses in a series (assigned arbitrarily, I assume).
Second column: the numbers actually engraved on the lenses.
FWIW, I have portrait euryscopes, all Series III, where some are marked as "#" and others are marked as "#a". I think the "a" designation appeared on more recent lenses. a similar scheme is seen in other Voigtlander lenses (such as petzvals: earliest f3.7: no number; redesigned f3.16: #, then followed by #a).
All my portrait euryscopes are marked "series III", I think the only way to be sure if no series number is marked, is to measure the aperture, as noted above.
I have a few early series IV euryscopes with no series number.
cheers
Tim
I suppose that must be right, Tim.
But what about 23 - 631 PR3444 - where he starts at /0, followed by /00, then 1 etc - another typo?
By the way,
The #0 and #00 are real series numbers for some of the Euryscops. I've seen some Series IV and Series VI with those numbers (the smallest of the series, usually for 4x5 or 5x7 coverage).
Tim
Okay,my bad the other one was not B&L, it was Carl Zeiss Jena tessar 16,5cm 1:3,5
I´ll take the photo and measurements of the Euryscope.
Outfit looks the same as Extra Rapid Euryscope, but engravings looks the same as Rapid Euryscope. Confusing
Gandolfi's no. 4 (approx. 10" F.4.5) may be the no.4 of the series III:
FL is 10 5/16"
Front lens is 2.5"
Coverage listed as for full plate.
So a precise measurement of FL or F will be needed.
will mesure more precise and get back to you
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