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

[Kirk Carbo <kcarbo@lobosservices.com>]

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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