Oops - I think you were looking for sheet film and Acros only comes in 35mm and 120.
If you find that you can use a tripod and the exposures exceed 1 second, consider Fuji Acros. Very little reciprocity until 100 seconds(?). Combine that will a compensating developer that holds back the highlights and you can get some nice night shots.----- Original Message ----- From: "Gerald Koch" <gerald.koch@xxxxxxx> To: <pure-silver@xxxxxxxxxxxxx> Sent: Monday, September 17, 2012 8:10 AMSubject: [pure-silver] Re: Optimum results pushing 4x5 Tri-x 320 at 800 or 1600iso??I agree with Richard that Phenidone and it derivatives give "about a stop more speed than box speed". The operative word here is "about". Additional speed is dependant on the choice of developer and I would say that Xtol yields the greatest speed increase. Even so texts that I am familiar with give a speed increase closer to 2/3 stop rather than a full stop.There is a saffety factor in the box speed of another 1 stop. So with careful metering you should be able to get about 2 extra stops of speed. The advice to bracket is a good one in circumstances such as described.JerryI think I took the request for push processing too literally. Those who suggested a time exposure are closer to the mark. That opens up a whole can of worms because of reciprocity effect. That effects not only effective exposure but contrast since it varies with light intensity as well as exposure time. I don't remember what the reciprocity characteristics of Tri-X 320 are but they must be available from Kodak. If you decide to use a time exposure they will give you some idea of how long an exposure is necessary and what adjustment to make in development time to compensate the contrast. Bracketing, as suggested by others, would be wise. I don't know what effect the developer has on reciprocity effect but suspect a Phenidone developer would still be advantageous.=============================================================================================================To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.
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