Voigtlander Euryscop lV No.4 lens covering?

Just found beautiful Voigtlander Euryscop lV No.4 and need some infos about.
Format covering? Aperture?
Sorry for bad pictures...
Thanks everybody!
Braca

PS. Also interested which format cover Euryscop 6A?

Attachment 103233Attachment 103234Attachment 103235

Series IV no. 4 is shown as covering 11x14".
Series III (?) 6a size is down as 11x14" too!

Excellent!
I believe the Euryscope series lV No. 4 have f6 aperture?
What about 6A?
Thank you very much Steven.

Series III is nominally F4.5. Matches well with the efl of 15 1/3" and front lens diameter of 3.5".
Believe or not, I found a 5a for sale in Northern Europe to-day. Not very common, though.

A 6A euryscop could be a series III, or a series VI. Series III is the f4.5 portrait euryscop, series VI is a F7 more or less standard aplanat type lens

Cheers

Tim

Series IV No. 4 = That serial number places it mid 1890s. It is an f/6, 14 1/3 FL for 10x12 wide open and 11x14 stopped down.

6a if Series III = F/4.5 covering 11x14
6a if Series VI = F/7.75 covering 18x22 wide open and 20x24 stopped down

Per 1890 Catalogue = http://antiquecameras.net/1890lenscatalogue.html

Dan

Thanks guys on infos!