If you are doing only one or two sheets at a time, you can develop them in a 120 tank - either singly by bending the sheet emulsion side in, or multiple sheets by slipping an elastic band around the sheet (so called taco method). I used this method when I began, and it works fine.
For most plastic tanks, you need the centre column in if you want the tank to be light tight.
I've since gotten hold of a Paterson Orbital, which is sort of like a tray with a lid on, so can be used for daylight developing. It can do four 4x5" sheets, two 5x7" or one 8x10. Very easy to load, and uses a minimal amount of chemistry. No problems with scratches or uneven development.


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so give it a try, when I wanted a 5x4 tank I was offered exactly what I was after another 2000 series Jobo with two reels. Last advert has been less successful 
"Real camera stores" are few & far between. (sigh)





