Times D-23

I am trying to figure out times for D-23 for certain films.
Is it possible to use times for D-76 and multiply by 1.25 (1/4)

Or if you have times for stock - but want to use 1+1 or even 1+3 do you know the multiplication factor?
For example if I use TRI-X at 800
In D-23 I have following times
Stock 800 11 min

in D-76
Stock 400-800 6.75 min
1+1 400-800 1+1 9.75 min


If I use multiplication for D-76
I get 9.75 x 1.25
12.19 or about 12 min and 12 sec.

Sounds like a good starting point; try it, see if you like it.

I use D23 for almost every film, and I always start at 12 minutes using a 1:1 dilution. It hasn't failed yet to give me a printable negative, and it only takes a roll or two to work out whether 10 minutes or 14 minutes will be better.

You can also take a look at http://www.digitaltruth.com/devchart.php to find some suggestions for developing times. But sacrificing a roll for some tests helped me a lot.
Long live D-23 - I really love it.

All the Best,
Brian

I use it replenished with a borax afterbath. I've found the D-76 times are a good starting point. A wonderful developer, easy to make, and stays good forever.

One thing that you will find amazing is the acceleration of development with but a small addition of sodium carbonate to this particular developer (which has low alkalinity to begin with). Even one gram of carbonate per liter of D-23 will speed things up considerably. Make tests and don't put in too much at the onset.

Sacrificing a roll for these tests is pure madness, not to mention expensive. Cut off one frame that was properly exposed in the camera, and process it in a plastic film canister, but don't trust that canister to be light-tight, even if black: do this development in complete darkness with about 10 ml of developer: (put the canister on its side, and continuously roll it in a water bath that is the correct temp). Or, simply use about 25 ml of developer in the canister, to fill it up, and keep it upright, turning it upside down for agitation about every 30 seconds.

The waste that most people employ for 'tests' pre-empts the result's usefulness. I would be bankrupt if I followed such advice. Ditto for printing: why use a whole piece of paper when you could use a piece one eighth the size and make a small print for such a test? Common sense is who I am married to and, no, I am NOT getting a divorce. - David Lyga

D-23 is an underappreciated developer that needs to be used more often rather than some of the weird soups that people dunk their films in. It can be used as a one-shot at various dilutions or as part of a replenished system.