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What are BTZS Tubes? As the video mentions, they are tubes from Phil Davis the writer of the book, Beyond the Zone System.

OK, so this 4×5 Part 1 video is a bit strange, but it shows BTZS tubes in action.  BTZS tubes are tubes used for sheet film development.

4×5 sheet film development in BTZS tubes Part 1: This is the “classical” video

4×5 sheet film development in BTZS tubes Part 2:

Here is the 8×10 sheet film development in BTZS tubes video:

These were from Fred Newman at the view camera store.

BTZS Equipment on eBay

Today’s site of the day is www.unblinkingeye.com.

This is another good resource site. It has articles that are often good step-by-step tutorials. Many are alternative process articles like
Getting Started In Wetplate Collodion Photography or this Lith Printing article.

Some are more basic how to articles such as this one on How to Develop Film.

It has Photographic Formulas for those with an interest in mixing their own darkroom chemicals.

Like the Massive Dev Chart at digitaltruth.com, this site also has Film Development Times.

A particularly nice resource page on this site is Alternative and Historical Process Links. Yep, more places I can go and spend hours.

It has travel photography articles such as A Spiritual Journey to West Bengal. I liked this one because I have several friends from India including one Bengali.

The content on this site is well worth checking out. That’s especially true if you are interested in old or alternative photographic processes.

Do you ever wonder how to determine the best development time, temperature and dilution for a particular developer and a particular film?

One of the best resources on the web for film development is the Massive Dev Chart at digitaltruth.com It will give you a basis for time and dilution for film and developer combinations. It is another must have resource for anyone doing his own film development.

Just go to the left of the screen and pick the film and developer of interest and the appropriate chart will display on your screen.

There are several other options to choose from as well. One is a printer friendly version and another is a version for handheld devices. How cool is that? Take your palm or handheld that runs java down to your darkroom and you’re all set.

If what you really need are darkroom formulas, they have those too. The Darkroom Formulas link will take you right to formulas for many developers

If that wasn’t enough, under the Product Information link on the home page, digitaltruth also has Data Sheets available for the photography products of several corporations. It’s a very convenient location to go and get this data.

Darkroom Equipment on eBay