Does developing time change with 220 vs. 120

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I just got a Patterson tank and reels that can hold two rolls of 220 or two rolls of 120 film. Since there's twice as much emulsion being developed on the 220 films will developing times, resulting density, etc. be affected or is there sufficient capacity in D-76 1:1 to develop the extra emulsion with no change in developing time?

-- Don Karon (dkaron@socal.rr.com), June 15, 2001

Answers

There is no change in developing times... PX is PX and TX or TMX is essentially no different when going from 120-220... just longer.

-- Scott Walton (scotlynn@shore.net), June 15, 2001.

I may be wrong, bit if one is using a highly dilute one-shot developer (HC-110 (B), Rodinal 1:50, Xtol 1:3, etc.) there may be some differences due to developer exhaustion.

It also depends on how much developer is put into the tank. For example, if you put one reel into a tank that holds two reels, and fill to tank up to the top with developer, then there is likely to be much less difference (if any) between the 120 and 220. But if you put two 220 reels into a two reel tank, using a highly dilute developer, there might be some difference in the development of the negatives compared to two 120 reels. The differences may be in negative density and/or “edge effect.”

That is why is it is usually recommended that photographers conduct their own development testing to determine times for their particular set-up.

-- Michael Feldman (mfeldman@qwest.net), June 16, 2001.


Michael has it right. Test! Actually, for best results, you should test for effective film speed AND development time for every film/camera/developer combination.

-- ricardo (ricardospanks1@yahoo.com), June 16, 2001.

Scott, where can I buy some of that 220 TMX?

-- Sal Santamaura (bc_hill@qwestinternet.net), June 16, 2001.

With D76 Kodak suggests you increase development time 10 percent for 220 if you are are using the same amount of chemistry that you would use for 120 eg. 250 each of D76 and of water. Seems to work for me the two or three times I used D76 for Delta 400 in 220. With XTOL it is a whole different story..._you must_ use at least 100mls of stock XTOL per 80 sq in of film. That means at least 100mls stock for a roll of 35mm or 120. For 220 that means at least 200 mls of stock. I can vouch for this as I shoot quite alot of D400 in 220 size.

-- Jim Vanson (p645n@hotmail.com), June 16, 2001.


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