Hi,
I'm new to the forum so please forgive me if I'm asking the obvious. A few years ago I bought a brass lens from a camera store, they had no idea what it was and so I bought it for a good price, because I liked the look of it and wanted some lenses to play with wet plate photography which I was just getting into. Anyway somehow I worked out that it was a Gasc and Charconnet lens. It didn't come with waterhouse stops so now I'm wondering how I should determine it's f-stop value (without the Waterhouse stops) as, in the short term, I'll be happy to use it fully open with 4x5 film anyway. I know I'm sounding like a complete novice but any help would be appreciated.
Tony
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