From: heather hyatt (heatherhyatt@yahoo.com)
Date: 06/03/01-02:27:19 PM Z
marc,
> thanks for the help. my normal exposure is about 8
secs. i took the filter into account. it isn't a
problem with the exposure but more with a bit of blur.
i think perhaps that since pinholes are kind of fuzzy
and IR is sort of fuzzy too that might be the
problem.
i have stock piled Kodak HSI, it is too bad they
stopped making it.
>
> Note that IR has a longer wavelength than visible
> light
> (depending on the filter you've used, maybe nearly
> two times).
>
> You have to take this into account when computing
> the
> appropriate diameter of your pinhole.
>
> BTW: Kodak HSI went out of production recently ...
> :-(
> The only other 4x5 IR film available now is Maco
> IR820c.
>
> Marco
> --
> Marco Pauck -- marco@pauck.de --
> http://www.pauck.de/marco/
> For every complex problem, there is a solution that
> is simple,
> neat, and wrong. -- H. L. Mencken
__________________________________________________
Do You Yahoo!?
Get personalized email addresses from Yahoo! Mail - only $35
a year! http://personal.mail.yahoo.com/
This archive was generated by hypermail 2b30 : 07/12/01-11:41:54 AM Z CST