With regard to Jim's question, didn't Richard Henry report that he found continuous agitation did not impair edge effects? That would seem to suggest that edge effects are primarily due to movement within the emulsion itself. I haven't seen any corroboration of that anywhere else though.(posted 8447 days ago)For what its worth, I did test the effect of dilution and agitation on Arista 125 in HC110. I found that agitation did change the curve shape over there - but only a small bit. Using continuous agitation provided slightly increased contrast in the highlights (Zone VIII and beyond) but I should emphasize that this was a small difference. I've got much greater changes in curve shape by using a different developer (like D23 to provide compensating development). Dilution did not change the curve shape at all - different dilutions yielded exactly the same effect as adjusting times. Extreme dilutions resulted in some loss of speed.
Continuous agitation did require an adjustment of time to compensate but along the order of 35-40%. My times with 10 seconds every minute were along the order of 6 mins. 6 mins with continuous agitation provided about the equivalent of an N+2.
Cheers, DJ.
Cheers, DJ.