[LargeFormat] Processing 4X5 recommandations.

[largeformat@f32.net]

Looking at the numbers fort he Yankee tank....  It holds a max of 12 4x5 
sheets which works out well with the 13 max you indicated for 1:1 D-76.

I tray develop in a 5x7 tray up to 6 sheets at one time.  With the dilute 
developer volume per 8"x10" I should be using 6/4 * 500 ml or 750 ml.  Now 
figuring the depth required in my "5x7" trays , which are 6"x8" with sloping 
sides.

(6" x 2.54 cm/in.) x (8" x 2.54 cm/in.) x (?depth" x 2.54 cm/in) = 750 ml x 1 
cm^3/ml

or ....    Depth = 0.95 inches.  Which is about 2/3 full!  I have to admit to 
using about 1/2 this much since I started processing about 30 years ago!

The 80 sq in rule means the developer is all used up and should not be used 
for a second batch.

What this means is ....

If you think you use less developer with a color processing drum and rolling 
to make sure the developer covers the film....... your not considering the 
developer may become exhausted before the job is finished.  If you put 4 - 
4x5 sheets in the drum you need to use at least 250 ml (8.45 oz.) of dilute 
developer.

Regards,
Fred