Wednesday, January 19, 2011

Monobath Field Processing Tanks for 4X5 Film

Two versions shown here, one to be opacified and capped, for a light-tight seal so we can process B&W Readyloads and the like (EPN shown as a prop) in broad daylight, and fast. The small catch at the base grabs the clip, allowing the sleeve to be pulled up through a light seal cap of rubber.

Yet another tank on the right needs nothing to protect it from the light. The top sleeve, in black with sporty red stop bar,  shown with fluid apertures, and a swelling paper that separates itself from the emulsion surface, to eliminate uneven monobath development. Under that, proof that just about anything can be a sleeve, made from a FedX envelope, and taped, and under that, the last of the Old Pol 4X5 material, soon to be depleted.

With dimensional modifications, we have made the clip and sleeve arrangement fit all of the holders, including the 500, 545, ReadyLoad, and Quickload systems. I like the late-model Kodak ReadyLoad holder the best, with its pressure plate, and lightweight design, but any of them can be used.


Anonymous said...

This can't come soon enough!! I have 16 sheets of 55 left and I thank you for what you're doing!!

Bob Crowley said...

We found that actually nobody wants to do this.

Anonymous said...

this also could be done for normal 4x5 sheets , nice monobath processing tanks for the darkroom, they only need to be light sealed ( perhaps mate black) and a black fastening on top

great !!!

Justin Parker said...

As I continue my journey reading through every post on this blog from the beginning until present, I find this one quite interesting.

Too bad you say "actually nobody wants to do this." I think if it could be done without the sleeving process being too difficult for the home user to do, it would be interesting. But I definitely see where a goop process would be of more appeal to people. Too bad the monobath can't be made into a solid film that gets applied onto the receiver paper, and just needs water or acid to initiate after being brought into contact with the film.

Bob Crowley said...

I like the idea too, which is why I spent a lot of time developing it, and we bought a lot of materials too.

Your wish for a water activated process is a good one. If you make it work, please share it.

The monobath is so easy and works so well that it keeps me up at night - not because it works, but because so few people are interested and that might be an indication of actual weak interest in the field generally. When we developed and sold ribbon microphones in the past, we found a large gap between the online buzz and what people actually would buy.