Dallmeyer 7D, 8D

[formatoff]

Hello,
Anyone know was 7d or 8D ever made with an aperture inside the barrel like that 6D?
139702
Please, show some pics of that one if it's possible.
Thanks.

[IanG]

As it happens I've the 1910 BJP Almanac open in front of me with looking at the Dallmeyer advertising, and the illustration shows the D series having a similar aperture mechanism, in fact by then every Dallmeyer lens appears to have an iris diaphragm aperture control.

Ian.

[Steven Tribe]

I think that all the "turn the barrel" diffusion patent portraits have the iris - otherwise the WHS stop might fall out!

The only exception is a 3B which I reconstructed from a complete set of lens cells! U/S irises are quite common with this design.