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#1
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TXP speed test
I just got my first batch of 4x5 TXP (Tri-x Professional) film. I did
a speed test ( .1 density above base and fog) using D-76. It came out 2 stops slower than rated. This really has me concerned. I'm not sure if this is normal for TXP, or if I have some bad developer or a bad batch of film. The developer is a brand new batch. I develeped it at 68 degrees for 6 mins. If anyone has exerience with this new Tri-X please let me know what you found. Thanks, Kevin |
#2
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In article ,
Kevin wrote: I just got my first batch of 4x5 TXP (Tri-x Professional) film. I did a speed test ( .1 density above base and fog) using D-76. It came out 2 stops slower than rated. This really has me concerned. I'm not sure if this is normal for TXP, or if I have some bad developer or a bad batch of film. The developer is a brand new batch. I develeped it at 68 degrees for 6 mins. If anyone has exerience with this new Tri-X please let me know what you found. Thanks, Kevin What dilution, is that 6 minutes what the data sheet suggests for the dilution you used, also what speed did you rate the film at initially? -- LF Website @ http://members.verizon.net/~gregoryblank "To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public."--Theodore Roosevelt, May 7, 1918 |
#3
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"Kevin" wrote
I just got my first batch of 4x5 TXP (Tri-x Professional) film. I did a speed test ( .1 density above base and fog) using D-76. It came out 2 stops slower than rated. This really has me concerned. What does a less pedagogical speed test reveal: what negative density do you get with an 18% grey card? ~.8 - 1.2 od is about average, IIRC. -- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/ |
#4
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I'm using D-76 undiluted. The recommended time for that with TXP is 6
mins. I haven't done a zone 5 test. I was actually thinking of doing a zone 7 test, but I don't feel very confident that things are right because having to overexpose by 2 stops seems excessive. I've never had that problem with the old Tri-X. Anyway, I think I will go ahead and do the zone 7 test and see if it comes out with the excepted density. On Thu, 21 Oct 2004 19:02:52 GMT, "Nicholas O. Lindan" wrote: "Kevin" wrote I just got my first batch of 4x5 TXP (Tri-x Professional) film. I did a speed test ( .1 density above base and fog) using D-76. It came out 2 stops slower than rated. This really has me concerned. What does a less pedagogical speed test reveal: what negative density do you get with an 18% grey card? ~.8 - 1.2 od is about average, IIRC. |
#5
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OK! There was something wrong. I double checked the dev time on the
D76 package and it was 9 min. for TXP instead of 6. I did a zone 5 and 6 test though with a 9 min. develpment and it still has a really low density of .32. Zone six was .49. This is really perplexing. Kevin On Fri, 22 Oct 2004 00:50:28 GMT, Kevin wrote: I'm using D-76 undiluted. The recommended time for that with TXP is 6 mins. I haven't done a zone 5 test. I was actually thinking of doing a zone 7 test, but I don't feel very confident that things are right because having to overexpose by 2 stops seems excessive. I've never had that problem with the old Tri-X. Anyway, I think I will go ahead and do the zone 7 test and see if it comes out with the excepted density. On Thu, 21 Oct 2004 19:02:52 GMT, "Nicholas O. Lindan" wrote: "Kevin" wrote I just got my first batch of 4x5 TXP (Tri-x Professional) film. I did a speed test ( .1 density above base and fog) using D-76. It came out 2 stops slower than rated. This really has me concerned. What does a less pedagogical speed test reveal: what negative density do you get with an 18% grey card? ~.8 - 1.2 od is about average, IIRC. |
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