A simple and elegant tool for processing 4 x 5" sheet film, the SP-645 Compact 4 x 5" Film Processing System from Stearman Press is a straightforward system for developing up to six sheets of film at a time. Using easy-to-load film holders, this daylight tank requires just 20 oz of solution for processing. It has integrated liquid level indicators to prevent under or overfilling, and its unique design promotes fast filling and draining. The system also permits the use of a thermometer during processing for more accurate and consistent developing results. It is constructed from durable ABS plastic and sealed with an O-ring to prevent spillage when using inversion agitation methods.
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Key Features
- Developing Tank with 3 Film Holders
- Holds Up to Six 4 x 5" Sheets Per Load
- Requires Only 20 oz of Solution
- Liquid Level Indicators
A simple and elegant tool for processing 4 x 5" sheet film, the SP-645 Compact 4 x 5" Film Processing System from Stearman Press is a straightforward system for developing up to six sheets of film at a time. Using easy-to-load film holders, this daylight tank requires just 20 oz of solution for processing. It has integrated liquid level indicators to prevent under or overfilling, and its unique design promotes fast filling and draining. The system also permits the use of a thermometer during processing for more accurate and consistent developing results. It is constructed from durable ABS plastic and sealed with an O-ring to prevent spillage when using inversion agitation methods.
More DetailsStearman Press 645100 Overview
Stearman Press 645100 Specs
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Packaging Info
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Stearman Press 645100 Reviews
Better Than Advertised
By Joshua
Rated 5 out of 5
Date: 2026-01-12
I read several reviews before purchasing and managed my expectations. My copy did not have any problems with sealing or excess manufacturing materials scraping the negs. It was easy to load the carriers but a little difficult to slot them in, working in a changing bag. If I had a legit darkroom to play it, that would not be a consideration. It's tight quarters in my changing bag most of the time with 4x5 so, maybe I need to take steps. Filling, draining, agitating, were all easy. It would be cool to have some kind of flow-through washing attachment like the Paterson film washer hose to streamline the washing process, but, then again, maybe I'm just lazy. I highly recommend this over the old school half-gallon tanks or wrestling 4x5s onto a spool. The only downside I can think of is that the body dries slower than the inserts.
Easy to load, works well
By Charles
Rated 5 out of 5
Date: 2025-10-17
We prefer the Stearman to a converted 35mm tank, especially for loading inside a changing bag. Only caveat is the light baffle systen - after cleaning the tank, you must be careful to re-insert them in the tank in correct order/orientation or there will be light leaks.
See any errors on this page?
I'm wondering what is the maximum amount of ...
I'm wondering what is the maximum amount of solution I can put in this tank?
The maximum amount of solution that can fit in the Stearman Press SP-645 Compact 4 x 5" Film Processing System (6 Sheet) is 20 oz (575ml).
Date published: 2025-05-05