Re: [APML] Speaking of E100 and Velvia

[Roland Roberts <roland@astrofoto.org>]

>>>>> "rr" == Robert Reeves <reeves10@swbell.net> writes:

    rr> Anyway, since the ISS flies through a low radiation
    rr> environment, they don't take up any films in the 800 speed
    rr> range because of fogging.  Don is going to try some 800 speed
    rr> anyway and attempt to shield the film with water packages
    rr> until getting it back to Earth.

Maybe he could also try some 400 speed film like Supra 400 (which can
still be purchased---I bought 50 rolls yesterday to stuff in the
freezer).  Presumably, it would be a bit less prone to
radiation-induced fogging than the 800 speed films.

Unfortunately, I don't know of any film data related to
radiation-induced fogging, so I don't think you can make any kind of a
prior estimate; you just have to try it.  Even if he doesn't want to risk
using film which may be ruined, perhaps he could take a roll of each
film candidate up and leave a roll here, then develop both (unexposed)
rolls to compare fog levels.

roland
-- 
		       PGP Key ID: 66 BC 3B CD
Roland B. Roberts, PhD                             RL Enterprises
roland@rlenter.com                     76-15 113th Street, Apt 3B
roland@astrofoto.org                       Forest Hills, NY 11375

--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>