EI for HP5 4x5 sheets

[walbergb]

I just finished testing the EI for my first box of HP5. Result: box speed. I've only used Tri-X until now (EI=200). Next step is to test for the corresponding development time. Just wondering what ISO others use for HP5?

[StoneNYC]

I just finished testing the EI for my first box of HP5. Result: box speed. I've only used Tri-X until now (EI=200). Next step is to test for the corresponding development time. Just wondering what ISO others use for HP5?

HP5+ and Acros100 are the only two sheet films that seem to be rated properly IMO.

[IanG]

I use HP5 at box speed 400 ISO with Pyrocat HD and find it a wonderful combination. In general I prefer slower films as I like to use slow shutter speeds but use HP5 for hand-held work with a Super Graphic.

Ian

[Regular Rod]

Box speed for me too and developed either in 510-PYRO 8.25 minutes or OBSIDIAN AQUA 12 minutes (both at 20 degrees Celsius and both semi-stand). Used mainly for night or hand-held work...

RR

[D-tach]

EI 320 in XTOL 1:1 and EI 200 in Pyrocat HD rotary developed.

Ian, what's your development technique if I may ask? I always seem to be getting thin negatives rated at box speed rotary developed in Pyrocat HD.

[IanG]

EI 320 in XTOL 1:1 and EI 200 in Pyrocat HD rotary developed.

Ian, what's your development technique if I may ask? I always seem to be getting thin negatives rated at box speed rotary developed in Pyrocat HD.

I use Jobo 2000 tanks, these are pre-Rotary and I use Inversion agitation, 15 minutes @ 20ºC Pyrocat HD 1+1 to 100, continuous agitation for the first 30 seconds then 3 inversions every minute.

Ian

[StoneNYC]

To clarify my earlier statement I use HP5+ at box speed in DD-X Rotary.

HC-110 is my backup, both work well at box.

[D-tach]

I use Jobo 2000 tanks, these are pre-Rotary and I use Inversion agitation, 15 minutes @ 20ºC Pyrocat HD 1+1 to 100, continuous agitation for the first 30 seconds then 3 inversions every minute.

Ian

Thanks Ian.

[neil poulsen]

Out of curiosiy, what was your testing procedure to determine EI?

Using the usual 0.1above film base plus of, I came up with an ASA of 160.

[Michael R]

HP5+ and Acros100 are the only two sheet films that seem to be rated properly IMO.

If a film has an ISO rating, that is its ISO speed. HP5 is 400. Acros is 100. Tri-X 320 is 320, etc. They are all rated properly.

EI is whatever you want. There is no standard. If you use the Zone System, for example, you try to find 0.1 above base+fog by stopping down 4 stops from metered, and that's cool, but it doesn't mean "box" speed is wrong.