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BTZS 4x5 B&W Film Tube Kit

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Product Description

BTZS Film Tubes are legendary among large format photographers.

Film Tubes are a simple to use rotary processing system that works better because of random two-axis manual rotation not found in any other processing system.

The tubes not only spin but wobble in the water bath therefore agitation is truly random.

Now you can mix different films, developers with different processing times and run them all in one run using a minimum amount of developer - only two ounces per 4x5 sheet - for greater economy.

Benefits are:

  • Even edge to edge development
  • Low chemistry usage
  • No rolling devise required
  • Process different films and/or different times in the same run
  • Convenient daylight operation


4x5 film tube kit includes:

  • Tempering and holding tray
  • Six 4x5 film tubes with caps
  • Six extra caps (no need to pour developer in the dark)
  • Illustrated instructions


I've been a photographer for over 25 years now and have constantly battled uneven development. Your tubes give me perfectly even development - and I am quite grateful. C. G.


It is rare to find a product as well thought out and as well made as the BTZS Film Tubes. F. T.


I bought the Film Tube Kit and a Film Test per your recommendation and have spent my time making photographs instead of testing ever since. J. Q.


Simple, Elegant . . . Congratulations! S. W.

Instructions are available for viewing as a PDF and may be downloaded to your desktop:

Product Videos

2. How to Use the BTZS 4x5 Film Tube Kit - Part 1 (08:53)
The 4x5 BTZS Film Tube Kit is design to process B&W sheet film with the best consistency and minimum time in the dark.
  • 2. How to Use ...
    The 4x5 BTZS Film Tube Kit is design to process B&W sheet film...
  • 3. How to Use ...
    The 4x5 BTZS Film Tube Kit is design to process B&W sheet film...

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Product Reviews

  1. Best way to process 4x5 film. The very Best. 5 Star Review

    Posted by on 28th Mar 2016

    BTZS tubes are amazing. The tubes, film testing, and Expo Dev have mad my life so much better. I cannot thank Fred enough for his help. BTZS is by far the only way to go with large format. If you are not using BTZS than you are at a loss. Thanks Fred.
    One thing to recommend is film hangers for fixing and beyond.

  2. Easy and economical way to do 4x5 processing 5 Star Review

    Posted by on 21st Nov 2015

    Big problem with processing the black and white film in the old conventional processing tanks was uneven process and the wasted chemistry. The individual roll process is far more convenient and works very well to keep even development on the film. Processing the latest negatives was so much better with very little time in complete darkness. Yes the processing tubes are well made and do not leak which is a very big plus.
    Yes I should have picked this up years ago to.

  3. Seriously changed the way I process negatives at home. 5 Star Review

    Posted by on 7th Apr 2015

    I didn't process sheet film at home because I didn't have a sink or space large enough to accommodate running water baths and trays, plus the awkwardness of kneeling into a bathtub in the dark was never very appealing either. The BTZS tubes system, and the fact the it is one of the most reliable, chemistry efficient, and it requires minimal time in total darkness has sold me on processing my sheet film when I can't get to a darkroom.

  4. I Should Have Bought These 6 years Ago 5 Star Review

    Posted by on 12th Jan 2015

    For 4x5 B&W Zone System, there's nothing more effective than the BTZS tube system. Saves money on chemicals, and allows each individual film to be processed individually.

    The product is stout, and not made of cheap materials. They'll last me a life-time.

    Simply, THE BEST!

    I should Have bought these 6 years ago

  5. Very good product 5 Star Review

    Posted by on 6th Jun 2014

    This is a very good system for developing sheet film. Sheets don't get scratched, as in tray processing. Each sheet can be developed to ideal conditions using the BTZS system. Once the tubes have been loaded, developing can take place with the lights on. Temperature is kept constant with the water bath. Developing is consistent and uniform. The 4x5 tubes are economical to use. Each tube holds 60 mL of developer, and one shot use also helps to provide consistent results.

  6. Perfectly Development 5 Star Review

    Posted by on 14th May 2014

    I had tried the taco method but found I couldn't pour the developer fast enough. This left each sheet half fogged. I bought the BTZS tubes, watched Fred's videos, and developed 6 sheets the first time (Ilford Delta 100 in Ilfosol-3). Everything was perfectly even! Such a simple, yet effective method. I will never develop any other way.

  7. BTZS 4x5 developing kit 5 Star Review

    Posted by on 6th Jan 2014

    This kit worked great the first time I used it. This beats tray processing by a mile.

  8. Even negs, very first time. 5 Star Review

    Posted by on 4th Nov 2013

    This set up is great! It's simple to use and I got great, evenly developed negatives the very first time! I bought it so I can develop each sheet of film individually. The design of the btzs system makes this pretty simple to do. The components are also of high quality.

  9. Development Tubes 5 Star Review

    Posted by on 27th Oct 2013

    Been using these for a couple years now and they provide a nearly impossible to mess up way to evenly develop sheet film for much easier printing!

    Highly suggested to large format photographers everywhere!

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