Hello everyone,

recently I picked up a Dallmeyer 6A lens. Since there is no info about that lens in the internet, I want to share some pictures with you.
Attachment 141136Attachment 141137
What I know about this lens that is was sold in Dec. 1871 to Liesegang. Does anyone know the focal length? There are some varying info (22" or 30") around.

Cheers!