two questions on Apo Nikkor 9/480

[Andrea Gazzoni]

Hi all Guru's,

I have just received this beauty and was trying to figure out what the silver lever circled in red in the picture is intended for.

Now go for the second question: filter thread (without having a caliper) seems to be 85-86mm, will i be able to use cokin P type filter holder and filters? I see an 86mm Filter Ring Adaptor that fits Cokin P Filters exists on Ebay but at this diameter it seems to be just as wide as the lens itself..so vignetting may occur..but not at this focal lenght... ok, maybe i got an answer yet

thanks in advance to anyone who will turn on the light for me, best forum ever on LF
Andrea

[Gene McCluney]

That lever opens and closes a slot where you could drop in waterhouse stops, instead of using the iris.

[Mystery Jig]

I have the same lens and always wondered about that lever. Now I know! By the way, the lens is sharp, sharp, sharp.

[Peter K]

In graphic arts the specially formed waterhouse-stop has to turned in a certain way. For this the scale at the lever is devided in degrees.

Optically the best places for a filter is in the center of a lens. Together with the waterhouse-stop you can mount gelatine filters.

Peter K

[Gene McCluney]

In graphic arts the specially formed waterhouse-stop has to turned in a certain way. For this the scale at the lever is devided in degrees.


Peter K

I think this has something to do with making screened halftones. The shape of the hole in the waterhouse stop can affect the shape of the final screen dots on the litho negtative. Some of these waterhouse stops, I have read, are a square hole.