Using a Stouffer transmission wedge is the ideal way to:

• Establish your film speed for your personal developing procedure.

• Establish your developing time for normal and N-1, N+1, etc, contrasts.

• Check speed and contrast of darkroom papers and copy positives etc.

• and many other uses.

An excellent cost effective way to get the most out of your film, equipment, materials, and the zone system.

• TXP4×5-21 Transmission Projection Scale (Step Wedge) - 4×5”, 21 step, Density increment 0.15 (1/2 stop), Dmax 3.05. Ideal for film speed testing purposes on 4×5” film. With care, the TXP4×5-21 can be inserted tightly into your holder on top of the film.

• T2115 Transmission Guide (Step Wedge) - 1/2×5”, 21 step, Density increment 0.15 (1/2 stop), Dmax 3.05. Similar to the TXP4×5-21 scale but in a smaller 1/2×5” strip.

Please see my resources page for some tips and demonstrations to get you started.