Reciprocity Failure for provia 100F Quickloads

[Carterofmars]

Reciprocity failure for Provia 100F.

Can I get some advice/tips. I'll be shooting in a few weeks; first field trip with my 4X5.

I hope to try some late evening/ night photography and want to be sure my exposure times are accurate if going longer than a few seconds.

Thanks...

 

[thegman]

Here is a link to the data sheet:

http://www.fujifilm.com/products/professional_films/pdf/provia_100f_datasheet.pdf

Looks like you don't need to worry unless you're going over 2 minute exposures.

 

[Carterofmars]

No exposure correction or color balance compensation
is required for exposures within a 1/4000 to 128 seconds
shutter speed range.


I think that covers it. Funny, I saw that data sheet earlier but missed that.

 

[thegman]

I had to search for it too, it's surprising for a short document, information seems hard to find, for me anyway.

 

[thrice]

Provia 100F has negligible reciprocity failure up to 6 minutes, and even then it's only about 1/10 stop. I have plotted the reciprocity characteristics and they fit very closly to the following function:

y = 0.9727x + 7.629E-7x^3

where x is your metered exposure and y is the actual exposure. If the E is throwing you, just use this equation:

y = 0.9727x + 0.0000007629x^3

Realistically though, I wouldn't really bother calculating it at all.