HP5+ and Tri-X in Rodinal

greenspun.com : LUSENET : B&W Photo - Film & Processing : One Thread

In the Agfa data sheet they give times for Tri-X in Rodinal at dilution of 1:25, 1:50 and 1:100 (e.g. 20m @ 20C at 1:100, EI 400), but for HP5+ they only give data for 1:25. 1:50 is "Not Recommended" and there isn't even a table entry at all for 1:100.

Is there really such a difference between Tri-X and HP+ in Rodinal? I've heard that T-grain films don't do well in it but I'm suprised data for HP5+ is left out.

-- Bob Atkins (bobatkins@hotmail.com), November 25, 2001


I should add that HP5+ is the ONLY film for which Agfa gives a "not recommended" rating for Rodinal at 1:50. They gives times for everything else from all theT-max films and Delta films to APX25, FP4+, Tri-X and all the Fuji Neopans as well as Kodak Recording 2475!

-- Bob Atkins (bobatkins@hotmail.com), November 25, 2001.

I have found that Rodinal works very well in ISO 100 T-Grain films. Haven't tried it with ISO 400 T-Grains.

-- Michael Feldman (mfeldman@qwest.net), November 26, 2001.

HP5+ works fine in Rodinal.

Try Rodinal 1:100 W/ 20G/L sodium sulfite added, 11'30"/68F rotary agitation, EI 320. If you don't have any sodium sulfite, give it EI 200-250. For intermittent agitation add about 15-20% time.

For 1:50 try a couple minutes less time as a starting point.

The added sodium sulfite isn't enough to have any significant effect on graininess; what it does is open up more development sites, giving a little real speed increase with Rodinal.

-- John Hicks (jbh@magicnet.net), November 26, 2001.

Yes, we can go and test for the 1:50 rodinal times for HP5+, but my question is why does Agfa consider it "not recommended"?

-- Russell Brooks (russell@ebrooks.og), November 26, 2001.

Thanks John for the Rodinal infor with rotary. Think I'll give it a try this week. I actually like the Rodinal/HP5+ combination.

-- Don M (Maldos@home.com), November 26, 2001.

Don't know why Agfa wouldn't have it listed. One reason could be the HP5+ tendency towards excessive base fog with longer development times. Some excellent platinum printers won't use it because the base fog density screws up their print values. A nice film otherwise.

-- Dan Smith (shooter@brigham.net), November 26, 2001.

I join the Dan's guess. I tried HP5+ (rated as ISO 160)in Rodinal 1+100: everithing wonderful except the fog. May be the 1+50 dilution is especially unfavorable in this regard (but I didn't tried it).

-- Andrey Vorobyov (AndreyVorobyov@yahoo.com), November 28, 2001.

In its prior version (HP5), the developing times were pretty similar to those of Tri-X. But that was over 10 years ago. I get pretty good results with HP5+ at EI 250 by developing it in Rodianl 1:50 for 12 min @ 68F.

-- Chuck Albertson (chucko@siteconnect.com), November 28, 2001.

In some of my experiments I found that HP5+ has a maximum contrast index (what we used to call gamma infinity) less than 0.65 in rodinal 1+50 and above. AGFA gives times for it in 1+100, but states the the maximum gradient will be 0.5, which they consider less than normal, and it would be less than normal if there is any flare in the camera. AGFA's normal is 0.65. Pat Gainer

-- Patrick A. Gainer (pgainer@rtol.net), December 03, 2001.

Moderation questions? read the FAQ