Sandy -
Thanks very much for the thoughtful and informative reply.
On the whole-plate holders, the light seal problems that I have are a consequence of the holders being a bit narrower than my back is designed for, so the fit isn't snug. If I'm not careful when seating the holder and removing the darkslide, which is just a bit stiff, there can be some leakage around the edge of the holder. If I'm in very bright sunlight I'll sometimes take the precaution of covering the back with my focusing hood while I'm pulling the darkslide. It's a bit fussy, but it helps. Overall, this has been just a nuisance, not a crippling problem.
I do remember that at the time you were still experimenting with the light trap and dark slide construction, and had taken a while to find a combination that would work for the smaller holders. I appreciate your offer to upgrade the light traps, but since I haven't seen any evidence with mine of a light trap problem per se, I don't see any need to impose on you for an upgrade at this point. If any suspicious problems do show up, I'll report details to you and we can figure out what, if any, specific action is warranted.
Re the T-dimension mismatch on the whole-plate holders, while I've fiddled a bit with shims, I must confess that I hadn't thought of the trick of putting a fresnel in front of the ground glass. I'm not a huge fan of fresnels, but I might try it at some point. Thanks for mentioning it.
As for the 11x14 holders, not to worry - they're not pining away in a dusty corner somewhere, they're actually enjoying a comfy life of leisure in my living room. (Don't ask... < g >) Seriously, I may yet take you up on that, depending on how my love/hate relationship with the quirky Tachihara holders pans out. Stay tuned...
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