Couple of old lenses

[Steven Tribe]

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!

[Tim Deming]

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

[Steven Tribe]

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?

[Tim Deming]

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?

good point. I dont have the book handy, and am going off of memory, so I may be messing up my columns! When I get home I'll have a look and let you know if I find anything sensical!

cheers

Tim

[Tim Deming]

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

[cdholden]

speaking of these eyroscop'es..

I have a beautiful one. (Portrait eyroscop)

But there is only one numbering on it: 4

FL approx 10"
F approx (I havn't mesured it precisely) 4.5

serial number 31749 makes it 1887 (?).

what serie?

Emil,
For identification purposes, could you measure the aperture? A Series II, No. 4 was a 9.75" focus lens, available in rack and pinion. Series II should have an aperture of f4.

Chris

[Raidahl]

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

[Steven Tribe]

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.

[Emil Schildt]

will mesure more precise and get back to you

[Emil Schildt]

Emil,
For identification purposes, could you measure the aperture? A Series II, No. 4 was a 9.75" focus lens, available in rack and pinion. Series II should have an aperture of f4.

Chris

I think you're right.

As far as I can calculate, this is slightly shorter than 10" and the aperture close to 4 (I calculated about 4.2)..

Rack and pinion (though missing).