Can someone put this in film terms

[mark]

From the MGIVRC data sheet


The speed of MULTIGRADE IV RC depends on the
filtration used during exposure. MULTIGRADE IV
RC unfiltered, has a paper speed of ISO P500.

[Ornello]

From the MGIVRC data sheet


The speed of MULTIGRADE IV RC depends on the
filtration used during exposure. MULTIGRADE IV
RC unfiltered, has a paper speed of ISO P500.

ISO paper speeds have no direct relation to film speeds.

[Bob F.]

Just as there is an ISO standard for film speeds, there is also an ISO standard for paper speeds. Just don't ask me what that standard is (!) - no doubt it will be defined on the Web somewhere... ISO is the International Standards Organization.

Cheers, Bob.

[mark]

Thanks Jay and Bob.

[Christopher Colley]

I meter my MGIV at ISO 6 and have acceptable results without any filtration. on a pinhole with an fstop around f/345, focal length of 100mm on a 'sunny 16' exposure its normally around 1minute 30seconds.

When putting a filter on it, I dont recall the exact numbers but I believe 0 - 3 all have a paper ISO around 200, and 4-5 are 100. Without a filter as mentioned its 500. Using these measures you can adjust your exposure accordingly, a #5 contrast filter puts the paper at 100 'iso' and a #2 puts it at 200 'iso' ..... at least in my experience doubling and halfing exposure has seemed to work just as it does with film ISO..

[mark]

Thanks Christopher.