Thursday, December 28, 2006

Frederic Harster

This lovely image was made by Frederic Harster, and is posted here with his permission.

Film: Tri-X
Format 35mm
Dilution: 1:100
Time: 8:00
Temp: 20C/68F
Agitation: Rotary

Thank you, Fred.


Amund Blix Aaeng said...

Woa, that`s fine grain from a 35mm Tri-X neg! That does it Jay, how can I buy some 510-Pyro to try?

jdef said...

Hi Amund.

You can just paypal $15+ shipping if you're outside the U.S., or including shipping if you're in the U.S. to If you're outside the U.S., tell me where you are and I can calculate the additional shipping. Thanks!


Amund Blix Aaeng said...

I`m in Norway Jay. Postal number 1369.

jdef said...
This comment has been removed by the author.
jdef said...

Hi Amund.

Tha additional shipping will be $5.00, or $20.00 total. Thanks!


Amund Blix Aaeng said...

Thanks, payment sent.

Mike S. said...

8 minutes at 20 degr C "rotary"; does that mean continuous rotary agitation a la Jobo?

Mine runs at 24C/75F so I'd wind up with a time around 5.5-6 minutes I think. Eager to try Tri-X in 510P!

Anonymous said...

This was indeed processed in a Jobo CPE2 with continuous rotation. 5.5mn should be ok at 24C if you presoak for 5mn like I did.

Anonymous said...

Amazing image! Thanks for posting this.


Grant said...

I just processed my first roll of 120 Tmax 400 and 2 4x5 sheets of HP5+ in 510 Pyro yesterday. Pretty amazing I must say. I have been using Rollo Pyro which I like as well, but just having one solution to mix like you would with HC-110 is really nice. I can post an image of one of the 4x5 sheets if you like. Not at all sure how to do that though.

jdef said...

Hi Grant,

Thanks for posting! I'm happy to know your results are satisfying, and I'd be very happy to post your images here. Please Send your jpeg files to me at:

and I'll post them. Please include as much detail as you'd like about the images, your processing data, etc. for the benefit of readers and fellow users of 510-Pyro.


Jim Byers said...

I just mixed up my first batch of 510 Pyro tonight and am getting ready to give it a try first with Tri-X shot at box speed.
But 800 ASA comes in handy. I haven't been able to find much information or comments about shooting Tri-X or HP5+ at 800 and developing in 510 Pyro though.
Jay, I think I saw a comment you made that it would not be a good idea to extend the development time because of oxidation and recommended decreasing the dilution instead. Any recommendation on the concentration change? I don't have a good handle on how concentration effects the development time. Generally it seems quite non linear.

I was thinking that before I did that I would instead extend the time but dump and refill with fresh developer half way through. It would be a little bit wasteful but a simple way to start without affecting the concentration.

jdef said...

Hi Jim,

I don't remember saying extending development was a bad idea, or the context in which I might have said it, but under the conditions you describe, I think extending development is the best approach, along with diluting the developer. I would recommend one of the following methods:

1) develop in 1:100/ 12min/ 70f/ agitate 30 sec every 3 min

2) develop in 1:300/ 24min/ 70f
agitate first minute, and then for 30 sec at 12 min.

the above are my best guesses, not tested data.

I highly recommend testing with test films before committing important films to my guesses. I hope you'll post your results here, when you have them, and some images, too. just email them to me at:

and I'll post them here
We all learn from the experiences of other users.

Jim said...

Hi Jeff,
Thank you for the push development time suggestions. I had a successful baseline today of Tri-X @800 rotary processed 11min 70c. The results were quite good. I lost a bit of highlight detail but given that the film was pushed it is very minor. Grain size is nicely small.
I am very encouraged by the results today. The 800 speed is very handy for me when using older medium format folding cameras where f11 and f16 are the sharpest f stops.
I will next try a side by side comparison with the methods and times you suggest and see if we can draw some conclusions.

jdef said...


Thank you for sharing your data here, and I hope you'll update us when you have more information, and images to post. I agree your results are very encouraging!