Optical Design for Dallmeyer Pentac 8 - Inch f/2.9 Lens

[sharpnikkor]

Hello,

I was trying to find the optical design for the Dallmeyer Pentac 8 0 Inch f/2.9 Lens

Mine was made by N.O.C. (National Optical Company) is stamped with an Air Ministry Crown and number

I have had it mounted on a Jo Lommen lens board for Speed Graphic. Will be trying it out soon.

Thanks,
Scott

 

[Dan Fromm]

It is a heliar type. From front to rear, cemented doublet (biconvex, concave-planor), singlet (biconcave), cemented doublet (plano-concave, biconvex).

 

[sharpnikkor]

Thank you Dan, I appreciate it.