Paper negs and iso???

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brianwar

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I want to use some Ilford paper in my large format camera, I will probably get some direct positive paper but for now I'll go with making a paper neg using resin coated MG IV pearl.

Anyone know what the equivelant iso of this will be? Ilford tech sheets say it's iso p500 which i understand is not the same as iso 500 film.

Internet advice seems to be saying around iso 6, anyone offer me any other advice?
 
I use it in my old Kodak Autographic and and the odd pinhole project. I've worked it out to be roughly about 4-6ISO going by my exposure times.
 
about ISO 6 worked for me and do a trial fit first 4x5 isn;t exactly 4" x 5" from memory. you might want a filter on there to reduce contrast a bit too, straight up I found it a bit much unless you want a really punchy image.
 
puggie said:
about ISO 6 worked for me and do a trial fit first 4x5 isn;t exactly 4" x 5" from memory. you might want a filter on there to reduce contrast a bit too, straight up I found it a bit much unless you want a really punchy image.
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If there's one thing I like, it's contrast so that's good!

I'll chop up some plain paper and see what'll fit the darkslide. Would be handy if it was just 5x4 as it'd mean I could just cut the 10x8 sheets of paper I have in half.
 
I seem to remember cutting up my first attempt to 4x5" exactly and it being a bit tight in the holders.
 
Well I did a bit of experimentation today and discovered that yes 5x4 isn't quite 5x4 but also that cutting a sheet of 10x8 in half doesn't give 5x4, it has to be cut in half again! Doh!

So that means 4 sheets of 5x4 for every sheet of 10x8 wahey!
 
I wonder if the 5x4 direct positive paper needs a bit chopped off the side to fit in the darkslide then?
 
It worked out at about 25 or 50 ISO when I worked with Ilford MG RC Satin paper inside a pin hole camera. Exposures then depended on the amount of light! Could've been anything from 30 seconds to 18 minutes, but that was working with no Aperture value I suppose.
 
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