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Re: [APML] 400F (was: Alternative Anti-Vignetting Photoshop Technique)
Provia sucks...evenly. You know what that means, don't you? We're not alone
any more. Stephen Pitt
John Boudreau wrote:
> > Is 400F the best slide film for galaxies currently available? Sorry, I
> > haven't been following this thread from the beginning.
> >
> > Ulrich
>
> Hi Ulrich.
> The "Provia 400F for galaxies" comment you're recalling was most probably
> made by me. I've been shooting it since February of last year, and find it
> to be the best overall UNHYPERED color film for galaxies I've yet tried.
> It's unhypered blue response is much better than E200. BTW --- I have also
> used E200 with success on galaxies, but overall the color balance of 400F is
> much better than E200, IMO. Provia 400F also shines for objects other than
> galaxies as both Jon Kolb and Matt BenDaniel have shown recently, and it's
> super fine grain stablemate, 100F, is THE BEST color film to shoot the
> smaller, very high surface brightness planetary nebula.
>
> Some 400F galaxies:
> http://people.ne.mediaone.net/jeboud/m51.htm
> http://people.ne.mediaone.net/jeboud/m82.htm
> http://people.ne.mediaone.net/jeboud/m87.htm
>
> Some E200 galaxies:
> http://people.ne.mediaone.net/jeboud/m65_m66.htm
> http://people.ne.mediaone.net/jeboud/m81.htm
>
> I should note that the blues in the E200 shots were stretched quite a lot in
> Photoshop. And what may seem like inconsistent exposure times are mostly due
> to nasty New England clouds sneaking up on me at times <g>.
>
> While I'm on the subject, having read other's comments and questions on 400F
> today, I should add that:
>
> 1. The 400F doesn't have the red sensitivity of E200, but IMO E200 is *too*
> sensitive to reds, compared to it's response to other colors. Of course, for
> the faintest red nebula, this is a plus for E200. But for many subjects, I
> think the color balance of 400F is much better than E200. Matt's recent M42
> is an outstanding example:
> http://people.ne.mediaone.net/mbendaniel1/gallery/astro/sword.html
>
> 2. 400F has much finer grain than any 400 class color negative film I can
> think of, but is not quite as fine grained as E200, but reasonably close.
>
> 3. I tend to agree with Marco's statement that 400F acts a bit slower than
> ISO 400 in practice. Some local pro photographers have mentioned to me that
> they think this is so also. But they still love it :o)
>
> 4. I have hypered a roll for 2 hrs, 50 degrees C at +3 psi (hand pump
> vacuum). Unfortunately the skies didn't cooperate that night as haze and
> later fog showed up, but what I *can* say is that there was no strong color
> shift, but blues may have been hurt somewhat, reds appeared _very_ slightly
> stronger. The overall differences were slight, and this really needs more
> testing. I think a very short hyper of an hour or even a bit less may help
> just might be a good thing for overall sensitivity. But with this film's
> fine unhypered reciprocity characteristics, I'll probably stick to using it
> unhypered. I have not pushed it, but I have seen a NGC 7000 shot from
> another APML member that was pushed 2 or 3x that looked pretty good.
>
> 5. Even though I have applauded 400F's blue response, It's certainly no
> hypered RG200 in that regard. But I think it's the best overall unhypered
> astro film, however E200 may still be preferred by some for the very
> faintest red subjects.
>
> John Boudreau
> jeboud@mediaone.net
> http://people.ne.mediaone.net/jeboud/astro.htm
>
> ----- Original Message -----
> From: Ulrich Beinert <analemma@gmx.de>
> To: <astro-photo@seds.org>
> Sent: Tuesday, January 08, 2002 12:54 PM
> Subject: AW: [APML] 400F (was: Alternative Anti-Vignetting Photoshop
> Technique)
>
> > Is 400F the best slide film for galaxies currently available? Sorry, I
> > haven't been following this thread from the beginning.
> >
> > Ulrich
> >
> > -----Ursprüngliche Nachricht-----
> > Von: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]Im
> > Auftrag von Herm
> > Gesendet: Dienstag, 8. Januar 2002 18:50
> > An: astro-photo@seds.org
> > Betreff: Re: [APML] 400F (was: Alternative Anti-Vignetting Photoshop
> > Technique)
> >
> >
> > Matt, I dont like using E200 for galaxy shots, it just does not work
> well..
> > on
> > the other hand its excellent for red stuff..
> >
> > Matt BenDaniel <matt@starmatt.com> wrote:
> >
> > >I think E200 is good for subjects that don't
> > >have a lot of red in them, like reflection nebulae and galaxies. E200
> > >is good for recording faint red nebulosity and for short exposures of
> > >red nebulae
> >
> > Herm
> > Astropics http://home.att.net/~hermperez
> >
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> >
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