Originally Posted by
Steven Tribe
I have added what looks like a stereo pair ( 2409/2410 aplanatic D) to-day to the serial number/type listing.
As these are quite small, I must conclude that "D" lenses are not those those that cover more 8"x10", but are for the standard stereo size of the period. I remember that Dallmeyer had specific lens series that were designated "stereoscopic" during this period.
These two tiny lenses (glass diameter just over 1") were listed as two separate items. 2409 had another front lens added. there was a simplied aperture system on these D lenses.
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