B/W Slides

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A short description of how to develop B/W slides with the ADOX SCALA B&W Reversal Kit and the CHS 100 II film

This is the Voigtländer Bessa with a Compur shutter and  Anastigmat Skopar f/4.5 lens. The production year is likely 1935.

This gorgeous slide was taken in a CHS 100 II film produced by ADOX. This is a orthopanchromatically sensitized B/W film optimized for greyscale separation. It has a very large exposure latitude. A great feature of this film is that it can be reversal processed to produce amazing slides.

I used the 4×5 sheets in this case. Finding the development times was the crucial part of the process. I started with the times provided for the Scala 50 film and the results were not good. The final image was not neat and the grain too coarse. I decided to contact the ADOX people and was lucky that Lina Bessonova answered my request. She provided the right times and instructions that I translated to my Lab Timer (app). 

Photo Technical Details

  • Camara Chamonix  CH45-F2
  • Lens Schneider Kreuznach APO-SYMMAR 210 mm 
  • Film:  CHS100II 100
  • Lightmeter Pentax digital spotmeter
  • Exposure time 10′ 29″ @ f/22
  • Developed in a Jobo tank 2520+2509
  • Development N with Scala Kit
  • Scanned with Epson v850 pro

Development procedure for 4×5 film

The development is made in three processing steps:

  • Phase I: 1st Developer, bleach, clear
  • Re-exposure
  • Phase II: 2nd developer, fixer, final wash

These times were used for a normal development (N). For N+1 or N+2, an increase of 10%  may be tested according to the suggestion from Johnson. I have not tested the extended development yet.  The times used for creating this particular slide are provided on Fig. 1. In this Figure, the first substep should be called tempering bad but the App I use, on its current version, does not allow to change the headings. The idea is to put the development tank in a 20 °C bad to equilibrate the temperature. This is important since I am using a Jobo 2520 rotary processor.

In the second step, the slides are extracted from the tank and exposed for 2 min on each side. Fig. 2 shows the exposure in a cristal contained  and submerged in water.

Finally, the slides return to the tank and the Phase II starts. The used times are provided in Fig. 3. At the end the slides are washed with a regular wetting agent (Fig 4.)

 Fig. 1 Times for Phase I 


 Fig. 2 Re-exposure


  Fig. 3 Times for Phase II


 Fig. 4 Final wash




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