Double-X 5222 reciprocity calulations

[Terrence Brennan]

Is there a source for making long exposure reciprocity calulations for Double-X 5222? Kodak only indicates that the film doesn't require adjustment from 1/10,000 to 1 second.

Ilford has a calculation for their films for making long exposures in which the indicated exposure time is raised to a specified power to get the final exposure time. For example, with HP5 Plus, one takes the indicated time--say 8 seconds--and raises it to the power of 1.31, which gives 15.24 seconds, which rounds up to 16 seconds.

 

[madNbad]

This video by David Hancock is about 23 minutes long but covers a variety of questions about exposing and developing Kodak 5222:

 

[Patrick Robert James]

Is there a source for making long exposure reciprocity calulations for Double-X 5222? Kodak only indicates that the film doesn't require adjustment from 1/10,000 to 1 second.

Ilford has a calculation for their films for making long exposures in which the indicated exposure time is raised to a specified power to get the final exposure time. For example, with HP5 Plus, one takes the indicated time--say 8 seconds--and raises it to the power of 1.31, which gives 15.24 seconds, which rounds up to 16 seconds.

That is good enough Terrence. 5222 is pretty flexible on exposure.

 

[otto.f]

Is there a source for making long exposure reciprocity calulations for Double-X 5222? Kodak only indicates that the film doesn't require adjustment from 1/10,000 to 1 second.

Ilford has a calculation for their films for making long exposures in which the indicated exposure time is raised to a specified power to get the final exposure time. For example, with HP5 Plus, one takes the indicated time--say 8 seconds--and raises it to the power of 1.31, which gives 15.24 seconds, which rounds up to 16 seconds.

Other brands than Ilford won't give very different figures, look at their datasheets, given by most webshops for film

 

[Donald Qualls]

At one point, there was a published table of Gainer exponents -- they work more or less like Ilford's reciprocity power, but they're stated as the amount of increase in time for each stop past the linearity limit -- 1 second for most films, but can be up to a minute for films like Acros or as little as 1/10 for a few (like Instax).