Compur shutter serial numbers

[chris73]

I collect and have handled many little Retinas.
So far i have only found rim set Compurs with an A preceding an 6 digit serial on the 149 model (1939-40).
Range of serials between A058370 to A206573.
Also all that little "A" shutters have only 3 shutter blades and one can say the blade "compound" is inferior to the non "A" little Compurs that hold not only 5 blades but are of more "shophisticated" engineering design.

I have no further clues

[Sean Mac]

I'm surprised your 8 1/2 inch Commercial Ektar even barely fits in your Technika when closed.

I'd known that the f6.3 Tessar covered a greater angle than its faster brethren but I didn't realize that it covered 70º stopped down until I re-read Arne Cröll's report that I cited above. The Commercial Ektars were described as covering an angle of 64º stopped down; the Symmar (plasmat formula) and the Symmar-S were said to cover 70º stopped down.

I think we are all aware of the caveats associated with the claims/statements of coverage of large format lenses.

David

In my innocence I planned to use the Technika with a 100mm Wide Field Ektar and the 8 1/2" Commercial Ektar.

This summer has shown me the error of my ways...

The plan for next year is all Geman glass and shutters.

90mm Rodenstock and 210mm Zeiss.

The 90mm F6.8 Grandagon is in a Compur 0 that has no serial number