Daft Question.... Waterhouse slot on old lenses

hoffy · Sep 28, 2017

Hey Folks,

I just recently got my hands on a nice little Cooke Triplet from a magic lantern. This is the first lens that I own that has a Waterhouse stop slot.

I hope this doesn't seem to daft, but if I am not using stops (which I'm not), do I need to cover the slot? Will this cause light leak issues?

Cheers

removed account4 · Sep 29, 2017

hi hoffy

people will likely tell you that you don't need to cover it
but i have a few lenses with slots in them
and i put a piece of cheap black masking tape over them
cause i am kind of paranoid

have fun!
john

Jim Jones · Sep 29, 2017

Taping the slot keeps bugs and anything else from reaching the interior surface of the lens.

Ces1um · Sep 29, 2017

I have lomography's daguerreotype lens. If I shoot outdoors in sunlight without an aperture plate in, I get results like this:

https://www.lomography.com/homes/ces1um/albums/2131541-daguerreotype-photos/21693707

I would recommend either using an aperture plate or covering the slot, especially in sunlight.

darkroommike · Sep 29, 2017

You may have a gem, I am not sure why a projector lens would have waterhouse stops, this may be a camera lens someone adapted to a projector.

hoffy · Sep 29, 2017

FWIW, the lens is a Niklas Projektions Objektiv. The focal length comes in at around 150mm and is estimated to be around F3.5

Thanks for the replies. A bit of tape it is then!

Daft Question.... Waterhouse slot on old lenses

hoffy

removed account4

Jim Jones

Ces1um

darkroommike

hoffy

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