Re: [APML] New Illford Black & White film

[Robert Reeves <reeves10@swbell.net>]

> Brian Roth wrote:
>
> > Has anyone tried the HP Delta 400 B&W professional film? It looks to
> > have spectral sensitivity well past H-alpha.
>
> I've not tried this film yet, but I've tried another Ilford: SFX200 (non
> hipered). This film has an IR extended sensitivity up to 720nm, so it
sounded
> promising to me. But when I've tried on North America nebula (with and
without a
> W92 red filter) I've discovered that there was nothing except the stars!
Maybe
> the reprocity is very bad on this film, or maybe there is a fall of
sensitivity
> at 654nm...
>
> Someone else have tried this film?
>
> Lorenzo

Hi Lorenzo,

I looked at this film when I was testing a lot of films for my book
"Wide-Field Astrophotography"
This film has perhaps the worst reciprocity failure of any I have tried.  It
is terrible.  It sounds good from the sensitivity standpoint, but the lack
of reciprocity overpowers the film and makes it useless for
astrophotography.

Robert Reeves                      reeves10@swbell.net
520 Rittiman Rd.                   www.robertreeves.com
San Antonio, Texas 78209    210-828-9036
USA                                     29.484  98.440  200 meters


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