He preferred Acros when compared with 3 other medium speed films - Tmax 100, FP4+ and Delta 100. He prefers a film that is "friendly for printing highlights". He likes "a characteristic curve that's a straight line or has a slight shoulder (the curve slopes downwards a little)" and Acros has the curve shape he was looking for. He found the film to have a pleasing separation of highlights and very good shadow separation. Though subjective, he also felt that Acros had finer grain as well as better reciprocity characteristics than the other 3.
He liked DDX because its liquid (which he prefers to powders) and has good keeping qualities (he decants to smaller bottles).
Although he mentions the use of a Jobo, there is no reference to presoaking. I, too, use a Jobo and prefer to presoak (5 minutes). I find that I get more consistent results with a presoak.
Fred Newman is the owner of The View Camera Store. You may want to contact him through the store's website.
Thanks for the response. Can I take it that you also use and find the Fred Newman times satisfactory with a 5 mins pre-soak? In other words the times quoted by Fred in your post do not need any alteration with a pre-soak?
I thought I'd better check this as the usual convention( well the Ilford recommendation anyway) is that without a pre-soak times need to be shortened by as much 15 or 20%. If you use Fred's times with a pre-soak then maybe Fred does also or it might be that with Acros it makes no difference to times.
I take your point about the benefits of a pre-soak when rotary processing. A guy called John Tinsley wrote a whole book about rotary processing in the early 90s and alway used a pre-soak and found that with a pre-soak he didn't need to make any alteration to Ilford times
Unfortunately there was no Acros, nor Ilford Delta when the book was written.
I think Acros is a great film but my question about Fred's perceived benefits was a reference to the negs at 1+9 as opposed to those at 1+4 rather than the characteristics of Acros as a film.
Maybe the negs at 1+9 print exactly the same as 1+4 in terms of grade, shadow and highlight detail but maybe there's a hint in what you say that at 1+9 the highlights are more easily manageable?
Thanks also for Fred Newman link
pentaxuser