I bought a gorgeous Derogy Petzval from Garett/gomules last week, and have mounted it on my Shen Hao 4x5. It's perfect! Now to use it. No shutter, obviously. Also no slot for stops. I need to get daytime exposures slow enough to count seconds. Here's what I have in mind. First, I'll order some ISO 25 b&w film from B&H. Next, I'll get some stiff black material and make some "coin" stops. These will be circular and fit snugly inside the barrel between the sets of elements. I'm thinking f16. To make, I'll measure the diameter of the tube, then divide that by two, then divide by two again and so on until I get to equivalent of f16 (lens is roughly f3.8 I think.) That will get me most of the way there but not all the way. I'm also thinking of buying a 62mm variable ND filter from B&H (2-8 stops.) I will also likely use color filters (red, orange, green, blue) on most shots as well. That will also eat up 1-3 stops. I just need to figure out how to attach filters to front of lens. I was hoping Cokin made a universal holder that would push fit onto the 61mm diameter lens hood, but can't find one. I suppose I could just hold filters in front of the lens. I'll have to think about it. I shoot at night a lot, so that right there solves a lot of problems to start with. Anyway, I love how the brass lens looks with my black & walnut Shen Hao! I might just leave it set up in my family room as a decoration, LOL.
Kent in SD
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