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I have a 12" Cooke with a good shutter. You want it? :D

You're saying if it's written by an idiot, it may be a reasonable deal?

Photos would greatly help in your quest.

Ok, I see it. The 0.3something is the measured (from what I gather) data. The fitted function is an estimate. Higher degree of error in the shorter exposures.

I was using:
Correction = 0.5167 * ln(metered_exposure_in_seconds) - 0.2

I plugged arbitrary times on my phone's calculator, and got results consistent with the graph.

You can make two column in Excel...
-- A | B
1 | 1 | =0.5167 * ln(A1) - 0.2
2 | 2 | =0.5167 * ln(A2) - 0.2
3 | 4 | =0.5167 * ln(A3) - 0.2
4 | 8 | =0.5167 * ln(A4) - 0.2
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They're talking about attaching the mirror in front of the lens though, not behind the focusing screen. Nonetheless, I like the reflex viewer idea better.

I tried shooting "up" with a Sinar P2...

There are a few LF shooters in OKC that I know of. Glad it's grown at least by one more!

If I remember correctly, we pumped this set up about 6 times—all at maximum power—and it still wasn't enough! More importantly, not all collodion are created equal. Some will be slower than others....

Specially with the 405 backs! Of the two versions I had, one was way to the side, and the other was almost way to the side.

Does anyone have a roll film back mask that I can print and cut out (maybe in PDF form) for a 4x5 ground glass? Figured asking first might save some time, before I start to make one from scratch.

I usually do 10's if minutes to almost an hour, so standing there is a bit of a pain. I set it in T, with the cable loosely tied around the tripod head or on a leg via bungee cord. The shaking from...

I'm prepared to offer $20 for it. I'll even cover shipping USPS priority.

If you think this is too low, then you kinda know what your price range is. In all seriousness though, I think your...

Since you're using strobes: Unless the ground vibration frequency is greater than the flash duration, the strobe should be able to freeze the motion--so you can probably use a tripod. Only thing is...

I'm surprised you don't have a DUO TLR. Or something similar.

After following you folks or a couple of years, an underlying tone seems to keep surfacing—fear of failure. Understandably, no for-profit organization wants to be deployed in an environment where...

Thanks! Didn't mean to hijack the post though.

You're referring to this comparison? http://www.clarkvision.com/photoinfo/film.vs.digital.1/index.html

Hmmm... 600 you say... http://www.filmsnotdead.com/2014/01/23/the-do-not-crop-winner-jefferson-chang/

1 box for the cause.

Try hiking with a Manfrotto 400 head with a Sinar P2 sitting on it. Thank goodness Oklahoma is flat!

Arca Swiss C1 Cube, Linhof 3D Micro, or Photo Clam Multiflex.