4 by 5 Film Development ------------------------------------------------------------------------------------------ How to develop 4 by5 film We were shown how to develop 4 by 5 film using trays and chemicals.. the similar to the way you would enlarge a photo in the darkroom, except in complete darkness. I came across a YouTube video on developing large format prints using 3 different methods. One is using the SP-445 developing tank. I wanted to buy one, but these run a cost of about $129 per tank, with a long delivery time. A week after I looked into this, one showed up in our class! So I think I will try this method instead of developing 4 by 5 film the old fashioned way, in complete darkness and chemicals in trays. I looked more closely at the SP 445 developing tank, and came across this instruction sheet from Spearman Press. It is a beneficial guideline to using the tank. Here are some key checklist items to look at prior to developing: Make sure the 'O...