From a post at photo.net 10 years ago. David Carper was an employee of Ilford back then.
"David Carper , Oct 24, 2004; 11:53 p.m. DD-X is the most similar ILFORD developer to T-Max, but it is still quite different. Speed is similar, with both giving about an extra stop. DD-X is sharper, but T-Max is finer grained (although you won't see a lot of difference until you start pushing). IIRC, DD-X times are a little longer, which should help you be more consistent with it.
David Carper"
Just wondering, if one wanted to dilute TMax developer a little more, would you expect the sharpness to improve?
I use T-MaxRS 1+9 but I can't tell if it is sharper than 1+4, I never made any comparison.
At 1+9 it is very economical. I use it for TMY400 and Fuji Neopan 400 and get full box speed on both film.
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