Anyone own Dallmeyer 3A waterhouse stops? Aperture size help needed

[Ron (Netherlands)]

95mm wide. Thanks.

sorry, mine are 'only' 81,55mm wide. Oh well, perhaps another fellow member could use them.

[Nasir]

The belows are the measurements of 3A’s WHS.

F4 88.89mm
F5.6 64.63mm
F8 46.00mm
F11 32.11mm
F16 22.72mm
F22 15.91mm

I measured the WHS holes by vernier calipers.
The second decimals vary so round to the first decimals.
I hope the measurements help you.

Attachment 220707

mhayashi, HUGE thanks for supplying this information. I really appreciate it.

Now I'm a little confused. I thought the 3A was an F4 lens wide open but you have a stop marked F4. My lens wide open aperture diameter is 92mm.

[Nasir]

mhayashi: please would you measure the thickness of your 3A WHS. I appreciate tolerances may be different but I'd like a reference starting point. Thanks.

[mhayashi]

mhayashi: please would you measure the thickness of your 3A WHS. I appreciate tolerances may be different but I'd like a reference starting point. Thanks.

The thicknesses of the WHS are 0.85mm, including the thickness of the black paint on the brass that you should consider when you make ones from brass.

[Kiwi7475]

The belows are the measurements of 3A’s WHS.

F4 88.89mm
F5.6 64.63mm
F8 46.00mm
F11 32.11mm
F16 22.72mm
F22 15.91mm

I measured the WHS holes by vernier calipers.
The second decimals vary so round to the first decimals.
I hope the measurements help you.

Attachment 220707

Hmmmm… all these seem to indicate that the focal length is around 350mm, not 400mm?

[Nasir]

The thicknesses of the WHS are 0.85mm, including the thickness of the black paint on the brass that you should consider when you make ones from brass.

mhayashi: Thank you very much

Kiwi7475: The Dallmeyer lens catalogue I've seen lists this lens as a 16 inch focal length. I think the difference in diameter is to do with the relative diameter as seen through the lens compared to actual diameter as calculated. Steven described this better than I can further up in this thread.

[Ron (Netherlands)]

The thicknesses of the WHS are 0.85mm, including the thickness of the black paint on the brass that you should consider when you make ones from brass.

Please note that in most cases the originally brass WHS were chemically blackened and not painted.

[mhayashi]

Please note that in most cases the originally brass WHS were chemically blackened and not painted.

Thanks Ron for pointing that. My WHS’s are also anodized.