Couple of old lenses

[Raidahl]

Hi,

Hope you could help me a little bit, firstly I have B&L 16,5cm f3,5 Tessar which has focusing system like this http://smg.photobucket.com/albums/v4...=2tesar165.jpg
I couldn´t find any information about the lens, age or anything.

Second thing, I bought Voigtländer Euryscop 4, and now I am wondering what would be the focal length of it? It also has one waterhouse stop. What is the aperture value and what it will be wide open ?

Thanks

[cdholden]

Tessars are common. Some are better than others, plus the coated ones are less troublesome with flare. The lens mount you link to, referred to as a "helical focus mount", allows you to change the focus of the lens without great changes in the focusing of the camera. This would be good if you're using larger apertures and changing the selective focus in order to focus on different subjects within the field of view. Shoot and enjoy.

Which Euryscope did you get? If there is a series number on it, it will tell a lot more about the lens. Also, what is the serial number? Dating the lens can tell what designs were offered at the time.

[Louis Pacilla]

Hi Raidal

As CD has pointed out, there are several Series in the Euryscope line. You may want to provide photos of your Eurysope or provide the script on your lens .

Here's a link & a bit of info on Euryscope Series & max f stop.


The official "PORTRAIT" Euryscope's came in two series . Series II f4 & Series III f4.5.

The Rapid is the Series IV which is f6

Medium Rapid is Series VI f7.7.

The wide angle Euryscope Series VII not sure of Max f stop.

The extra Wide angle Euryscope was also made but I'm not sure of Series # or
max f stop


http://books.google.com/books?id=tsJ...3%2C380&edge=0

[Emil Schildt]

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?

[goamules]

Another great resource is this 1890 catalog, which lists all of the Euryscops:

http://www.antiquecameras.net/1890lenscatalogue.html

[Emil Schildt]

Another great resource is this 1890 catalog, which lists all of the Euryscops:

http://www.antiquecameras.net/1890lenscatalogue.html

yes - thanks for this.

I don't know how I missed that....

[Steven Tribe]

Emil, it looks like yours is the 4A of series III in the old BF & Co catalogue.
In the corresponding list in the Prochnow book, the additional numbers 1,2,3,4 etc are printed alongside the 1a, 2a etc. in bold.

[Emil Schildt]

Emil, it looks like yours is the 4A of series III in the old BF & Co catalogue.
In the corresponding list in the Prochnow book, the additional numbers 1,2,3,4 etc are printed alongside the 1a, 2a etc. in bold.

hmm - not quite sure I understand.

If it is a 4A, why does it then only have the number 4 on it?

[Steven Tribe]

The technical specification from Voigtlländer IS 4a - but the lens was only engraved with the 4.
We could look at another (more complicated) example - Series V 1:6.
The increasing sizes are 0,00,1,2,3,4 and 5.
However, the engravings on the lenses that correspond to these sizes are 1,2,3,4,5,6 and 7!
The engravings on Portrait Euryscope series III become real nightmare. A later production started at engraved no.9 and went up to 17 (66cm!). So that number 13 is about the same as your early production 4.
I think this right but would welcome corrections to my understanding of Euryscope number engravings?

I'll take a couple of bad photos of parts of the page - with respect to recent copyright - tomorrow.

[cdholden]

Steven,
I have one of these also. Mine has the 4a marking, but not the series. I concluded it was Series III from its aperture, f4.5, and that I found no other series that used "a" after a number.
Emil's lens appears to be with rack and pinion where mine is just a solid barrel.

Chris