[APML]: Risp: Minus violet filter

["Alfredo Zanazzo" <alferd@mbox.lol.it>]

Question:
what is the advantage of using this filter with hyprede TP?
Does it change the focus position?
--
Regards, Alfredo Zanazzo ( alferd@mbox.lol.it )

Professional home pages:   http://www.lol.it/aziende/music/zanazzo
Astronomy home page (Off/axis guider-camera project):
http://www.lol.it/~alferd




----------
> Da: Steve Bell <sb635@delphi.com>
> A: astro-photo@nightsky.com
> Oggetto: Re: [APML]: Questions
> Data: mercoledì 18 settembre 1996 19.47
> 
> 
> Brad Wallis wrote:
> > 
> > 
> > 2.  Can hypered film be re-hypered?
> > 
> > NO .. you'd only add more fog ...
> 
> I have a related question. If some 2415 turned out to be not very
hypered, say, 0.05 above base (ie, not very 
> fogged at all), can you then stick it back in the tank and hyper it some
more?
> 
> 
> -- 
> Clear skies,
> Steve Bell
> sb635@delphi.com
> http://people.delphi.com/sb635 - Astrophoto page