Jobo Expert DRUM dev. times

Hello.

Today i made my first batch with Jobo Expert Drum 3006. Normally i use the Jobo 2500 with the 4x5 reels.
Machine is CPA2,
film is hp5
developer is PyroCAT HD

for the 2500 drum i had 11min30sec of development. ( 4 sheets ) 300 ml od developer.

i applied same times to the Expert Drum processing (400 ml developer) , but results was undeveloped negatives.

Do Expert drums need more time for development under same conditions??

thanks a lot.

orworider said:

...i applied same times to the Expert Drum processing (400 ml developer) , but results was undeveloped negatives...

Click to expand...

Undeveloped or underdeveloped?

I use the capacity of pyrocat HD at 1:1:100 at 75ml per sheet 4x5 developing in a rotary-processor

If you were doing 6 sheets of 4x5 then you'd be exhausting the soup, which should get 450ml at a minimum.

Welcome to APUG Photrio!

When using the Jobo processor for any size negative look at the manufacturers' recommendations for rotational film processing for a starting point.