Re: [APML] Tech Pan 120 ....

[George Anderson <georgea@cam.org>]

Also keep your eyes open on Astromart, I picked up a Lumicon 72mm HA for
$71 (IIRC) last winter.
>From what I can remember the "bandpass" for the lumicon HA is based on a
combination of the filter characteristics and the response of the film.

George Anderson
Montreal Canada

Clear skies and good health 

Kirk Carbo wrote:
> 
> Try using a 29A red filter if you are shooting tech pan.  Wallace and Provin
> cover the use of red filters in their book and have some numbers on
> published on red filters.  A red filter in that size is 20 to 40 dollars.
> An h-alpha filter in that size will probably run at least $300.
> 
> Kirk Carbo
> 
> >-----Original Message-----
> >From: Jeff Crilly [mailto:jlcapml@sbcglobal.net]
> >Sent: Tuesday, June 29, 2004 1:23 AM
> >To: Discussion of Film Astrophotography
> >Subject: Re: [APML] Tech Pan 120 ....
> >
> >
> >Speaking of techpan...
> >
> >I'm wondering if anyone has used techpan with an
> >halpha
> >filter from moderate (no milkyway) light polluted
> >location?
> >And with a fairly large size film (e.g. medium
> >format).
> >
> >The lumicon filter claims a 10-fold reduction in light
> >pollution.
> >However, the bandpass is not actually a narrowband
> >filter...
> >its really a highpass filter.
> >
> >The astronomik's are, I beleive availbale in a
> >narrowband,
> >but probably really really pricey in 72mm sizes.
> >
> >Would the lumicon (or others) work?  Or am I relegated
> >to driving 200+miles
> >to the dark sky site for decent astrophotos on film?
> >
> >thanks
> >
> >jeff
> >
> >
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