Pyrocat HD and Efke PL 100 12x20 inch sheet film

I will soon be moving up a notch(!) to 12x20 and will be processing Efke PL 100 using BTZS tubes and Pyrocat HD. Any suggestions on adjustments to be made in developing times to those I use for 8x10?

I dont think you will have to make any changes in development time if you are using the same film and developer. From what I understand the J&C film is the same, they just cut it in different sizes from a master roll.

Ah wait, are you going from tray developent to drum developent? if so, a good rule of thumb is about 15 to 20% less time, but it is still iffy, better try it with a negative that is not important.

Francesco said:

I will soon be moving up a notch(!) to 12x20 and will be processing Efke PL 100 using BTZS tubes and Pyrocat HD. Any suggestions on adjustments to be made in developing times to those I use for 8x10?

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Francesco,

Have you already purchased 12X20 BTZS tubes? If not I think it would be more practical, and cost you less also, to buy a used Beseler print drum and motor base. The BTZS tubes are wonderful for the smaller sizes but I found them fairly awkward to use in 7X17 and 12X20 size.

Sandy

I have not yet purchased any tubes Sandy. What are the specs or product code for the Beseler print drum and motor base? Appreciate your help.

Francesco said:

I have not yet purchased any tubes Sandy. What are the specs or product code for the Beseler print drum and motor base? Appreciate your help.

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The drum I use is one of thed 16X20 color print drums by Beseler. But you want to make sure that the drum still has the plastic dividers. The drums came originally with three removable dividers but for 12X20 film you only need two of them. The motor base could be either a Beseler or Unicolor as they work about the same. You want to make sure that you get one that switches directions instead of the type that rotates only in one direction.

You see this type of equipment very often on ebay and the going price of the drums is about $20-40 and the motor bases usually go for about $40-50. And you can sometimes find this type of equpment at a palce like Midwest Photo or Columbia Camera.