Kodak Rapid Process Copy Film (RPC) any experience?

[thedarkroomstudios]

Got a roll from a guy who's got a brick and is making me be the 1st to screw up an experiment. I didn't find any references here in a quick search.

Kodak Rapid Process Copy Film (cat 175 3151)

I probably screwed up 'cuz I think I calculated an effective iso of about 3 if shooting in daylight. Could be even lower than that, but, I am no mathematician and I sort of started estimating

So, I will try to get out Sunday and do some shooting around. The tech sheet included gives little to go on. It says things like "can be developed in standard b/w developers" well... isn't that special. Do I go for D-76 1:1 for about 13 Minutes at 20C and hope for the best?

I hope someone's shot with this before and has a better plan than mine of picking a reasonable starting point and bracketing 18 over/under (roll of 36) and the above developing and using this roll as a base for the rest of the brick.

Thanks,

Brad

 

[Konical]

Good Evening, Brad,

Why shoot a whole roll? Just rack off ten or twelve shots with widely varying exposures; then open the camera in darkness, clip off the exposed portion and load it into a developing tank. Cut a new leader on the remaining film and use it for more tests to fine-tune your exposure and/or development.

Konical

 

[Jim Chinn]

Is that the equivalent of the Agfa Copex film? If so, there is an article discussing both films, developing and use in the new issue of Black and White Photography.

 

[thedarkroomstudios]

Konical... sometimes the obvious just escapes me That and I am sometimes a little lazy :O But, yes, I guess I should do as you suggest.

Jim... not sure, hopefully someone here'll let me know.

Thanks,

Brad

 

[KenS]

Brad,

ISO is closer to about 0.06 or thereabouts. It has been some 10 years since I last used any, but I still have a 100 foot roll hidden down at the bottom of my freezer. It was for making direct positive slides for x-rays and worked somewhat well for making "quickie" slides from B/W prints as long as you did not mind the blue tinted base. It was not unusual to have f8.0 exposures in the 40 second range.

Ken

 

[Kobin]

xray copy film

I used this stuff to copy film-based xray images illuminated on a light box. It processed well through the standard 90 second xray film processors (developed around 94 degrees F, if I recall). Exposures for illuminated radiographs ran from 13 to 30 seconds at about f8 on my K1000; distance was whatever needed to include the original image in the field. Originals were sized 8x10, 10x12, and 14x17. I can't remember if I ran it in the dark or not. If I exposed it to the xray safelight, it would have been OC filtered and RPC would then be an ortho film, because most high-speed xray films are orthochromatic. But I might have turned off the safelight; I can't remember.

I never tried developing RPC as regular negative film, but if I had to try, I'd start off with what Kodak recommends for its ortho copy film after doing a safelight test.

K.

 

[thedarkroomstudios]

Thanks... I'll give it a go this evening.