RE: [APML] Ilford B&W film + H-Alpha filter

[Kirk Carbo <kcarbo@lobosservices.com>]

Phil,

Michael A. Covington tested these films in his book Astrophotography for the
Amateur.  The top performer for H-Alpha is hypered tech pan.  He found that
Ilford HP5 also has decent H-Alpha response, not as good as Techpan though.
It's been awhile since I read his book, but I believe the Delta film and the
chromogenic films (C41 processing) were poor in the red region.

Kirk Carbo

>-----Original Message-----
>From: starfest@comcast.net [mailto:starfest@comcast.net]
>Sent: Thursday, May 27, 2004 1:22 PM
>To: astro-photo@seds.org
>Subject: [APML] Ilford B&W film + H-Alpha filter
>
>
>I have heard that there is an Ilford film capable of producing 
>images similar to hypered Tech Pan when used with an H-Alpha 
>filter. I have also heard differing opinions on which of the 
>Ilford 400 speed B&W films it is. Looking at the spectral 
>sensitivity charts for the following three films, it appears 
>that the Delta 400 has the best 650nm+ sensitivity:
>
>- Delta 400
>- XP2 Super 400 (C41 processing)
>- HP5 Plus
>
>Anyone have experience with any of these? At TSP, I did try 
>the XP2 (pushed to 800) with a borrowed Lumicon H-Alpha filter 
>(thx Jay) on the Lagoon for 60 minutes at f/5.9 and nothing 
>showed up on the film.
>
>-Phil
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