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Re: [APML] RE: Red sensitive negative films?

I just had a look at the konica-minolta website and the pdf for the
vx-400 film. The curve for the reds is starting to do a steep nose dive
around 656nm but might be close enough. There is a huge gap between the
blue and green that will miss OIII and H-Beta (not too uncommon). The
sheet does list the reciprocity failure rate at 1 full stop after 10
seconds though.
Proof is in the shots though, Ilford SFX looks like the magic bullet on
paper. Fact is I can probably record more with just about any film out
there. It is probably the only film that performs worse than un-hypered
TP developed in Dektol.

George
Clear skies and good health

Alan Voetsch wrote:
> 
> Hey Chris,
> 
> Konica VX400 may be worth a try. It is the film Adorama substitutued
> when I tried to order the Centuria 400 (without giving me notice of
> course).
> 
> Just went to the older computer and pulled up the 2 shots I did with
> it; 75 and 125 minutes on M42 and the Running Man area. It has an
> overall purplish cast and M42's core was 'blocked' out. 'Burned' out
> would not describe what happened. Happened on both shots and those are
> the only 2 I shot on this film as I was trying to compare several films
> in a short time. Wasn't sure if it was a film problem or something I
> did differently while scanning. With me, you never know.
> 
> It might work very well for objects that don't have tons of dynamic
> range.
> 
> Alan
> 
> --- Chris Schur <comets133@yahoo.com> wrote:
> 
> > John, yes Im looking for a color neg replacement for
> > the aging supra 400, which now is so red I can hardly
> > process it.  The desire for a neg film is due to the
> > much larger dynamic range compared to slide films such
> > as E200, and the fiasco of the slide chemistry.
> > Besides being very expensive now, slide chemistry only
> > lasts a month and a half at best after it is mixed and
> > used once.  Local store processing of slides takes
> > WEEKS and the results are always terrible to
> > disasterous!
> >
> > I think many of us are at a cross roads with film.  I
> > built my second observatory to shoot the schmidt at
> > pristine skies, yet with no good films in sight, I
> > will have to decomission the whole schmidt camera.  A
> > very sad thought!
> >
> > Chris
> >
> > --- spampit <spampit@shaw.ca> wrote:
> >
> > > Sorry Chris,
> > >     I don't know of any print films left standing with
> > > h-alpha
> > > sensitivity, just slide films. I think we both
> > > remember the days when so
> > > many films were available that it was difficult to
> > > chose one! I have
> > > switched most of my imaging over to the ST8 now and
> > > am not actively looking
> > > for new films. Perhaps Brian Larmay's research will
> > > turn something up?
> > >
> > > John Mirtle
> > > Calgary, Ab. Canada
> > >
> > > -----Original Message-----
> > > From: astro-photo-bounces@seds.org
> > > [mailto:astro-photo-bounces@seds.org] On
> > > Behalf Of Chris Schur
> > > Sent: Monday, August 08, 2005 12:58 PM
> > > To: Discussion of Film Astrophotography
> > > Subject: RE: [APML] M22 in the Starclouds
> > >
> > > John, yes the supra is now right at the limit of
> > > fixability as far as reds.  Time to dig a big hole
> > > and
> > > bury the lot!  Any good red sensitive neg films
> > > left??
> > >
> > > Chris
> > >
> > > --- spampit <spampit@shaw.ca> wrote:
> > >
> > > > Looks good Chris!
> > > >   Is the shift towards red on the RH side real or
> > > is
> > > > your aging Supra
> > > > acting up? For comparison, I have a shot of almost
> > > > the same field with tech
> > > > pan. It gives a hint as to how numerous the stars
> > > > are in that field!
> > > >
> > > > http://www.astrofoto.ca/john/m22-28.htm
> > > >
> > > > John Mirtle
> > > > Calgary, Ab. Canada
> > > >
> > > > -----Original Message-----
> > > > From: astro-photo-bounces@seds.org
> > > > [mailto:astro-photo-bounces@seds.org] On
> > > > Behalf Of Chris Schur
> > > > Sent: Monday, August 08, 2005 6:29 AM
> > > > To: APML
> > > > Subject: [APML] M22 in the Starclouds
> > > >
> > > > Hi All,
> > > >
> > > > Here's a new image from the last trip up to the
> > > > observatory earlier this
> > > > month. I was interested in capturing some of the
> > > > dark nebula that inhabit
> > > > this part of the sky as well:
> > > >
> > > >
> > >
> > http://www.schursastrophotography.com/filmimagepages/m22-1.html
> > > >
> > > > Comments?
> > > >
> > > >
> > > > Clear Skies,
> > > >
> > > > Chris Schur
> > > > Astro: http://schursastrophotography.com
> > > > Robotics:
> > > >
> > > http://schursastrophotography.com/roboticsmain.html
> > > >
> > > > ---
> > > >
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> 
> SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
> FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
> & http://www.pbase.com/avoetsch12952/fs102
> & http://www.pbase.com/avoetsch12952/takpf
> 
> 
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