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sper

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  1. FIrst I'll give you my dev info. 510 Pyro @ 21C diluted 1:100, 7 minutes (As suggested from Digital Truth). Dip and dunk development. Constant agitation for first 30 seconds then 10 seconds for every minute. My agitation style is normal, I lift the holders out of the liquid and rap them on the edge of the tank in one direction, dip, lift out,and then wrap them in the other direction (for full coverage). Water Stop and TF-4 Fix. 4x5 sheets of FP-4+. I always develop 4 sheets at a time. I did a threshold test that indicated a clear ISO of 125. But upon exposing for the full ten zones, I found an inconsistency in that my fb+f was not .05-.1 away from my zone 1 density, as it was in my initial test. Upon reading the remaining zones, I found more or less normal gradiation until zones 8,9, and 10. These zones indicated a max density of 1.03. This is at my nominal development time from digital truth (digital guess...har har). Now I know this to be too low. I should be getting a max density of 1.5 or so, right? First of all I don't understand the rather large inconsistency between my initial threshold test and my N roll. (It's not a roll, I know, but that's what I call it. I'm referring to my ten zones exposed over two 4x5 sheets) This inconsistency worries me, but I accept it within reason. Should I be agitating more vigorously? More time? Temp? Exposure? I just really don't know where to go here. I'm thinking do another 10 zones over two sheets, expose at ISO 64 and maybe go up to 75F. What do you guys think of that? I can't figure why my initial threshold test would be so different. I am a very consistent in my development style. Should I perhaps be using a syringe to extract the 510 Pyro? That is some thick stuff and I fear my graduate measurements are less accurate due the developer sticking to the sides. This would be while measuring up to 10ml, not while pouring it out, as I keep filling and dumping until the cylinder appears clean. This could only add a few ml of developer though, and shouldn't explain less desnsity. Oh by the way, I'm taking densitometer readings from the blue channel. I gotta get to class so no time for spell check! Thanks guys! -Mark
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