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Re: [APML] Black Negs a new developement
I'd lean on a combo of things- possible bad fix, plus the light pollution. At
f3.9, you really can't go that long in mag 4 skies, but I really haven't used an
HA filter, which I hear blocks most all LP (and everything but HA). Maybe
bracket some quick shots- 5-30 minutes. if they are still black, you can
eliminate LP from the equasion.
PS- that story was real funny Jerry (your also reading this?)
Sean Walker
Brian Sledz wrote:
> Ok Sean as long as guys aren't getting tired of it. ;-]
>
> Location-Mag 4 30 miles west of Chicago
> Filter-Lumicon 77mm Halpha
> Scopes- Pentax 100mm SDUFII f4, Takahashi CN212 at f3.9
> Cameras-Pentax 6x7 camera, Nikon F3 or Olympus OM1
> Film-Lumicon Hypered Tech Pan in 120 or 35mm purchased from Feb to June of
> this year.
> Exposure Times 30-60 minutes.
> Objects- Emission Nebula
> Developer-Fresh D19 8 minutes 68 degrees,Ilford Fixer, Kodak Photo Flo and
> Kodak Stop and 70 degree rinse
> Process-by rotation in Patterson Reels.
>
> Some film put on developing reels in changing bag in a darkened room, others
> put on reel in dark room.
>
> Sean, you might be right about the light pollution. Last night I took e200
> and used the h alpha filter and the California nebula shot came out but it
> was only 20 minutes at f4. The other shots I took were 30 40 and 60 minutes
> and the slides were all solid red.
> If it is the light pollution, then would the negs be black on TP? I did
> have 2 times when I developed TP when I could barely make out the division
> between the frames if I held it up to a very bright light. I always assumed
> the filter would allow at least a 30 minute exposure. Until last night I
> had not taken anything shorter than 30 minutes. I had seen many shots with
> TP and h alpha assuming the light pollution was similar to mine. BUT maybe
> it is much worse than the shots I had seen. If that is the case, I will be
> much more inquisitive when someone says they live in light pollution. ;-]
>
> Thanks to everyone for the help. It is very much appreciated!!!
>
> Best Regards
> Brian
>
> ----- Original Message -----
> From: "Sean Walker" <vze2c3z8@verizon.net>
> To: <astro-photo@seds.org>
> Sent: Tuesday, December 11, 2001 7:30 PM
> Subject: Re: [APML] Black Negs a new developement
>
> > Ok, but It's still pretty useless to shoot TP in LP.
> > Brian, can you reiterate everything about the negs all in one post? you're
> > giving us drips of info, and it's not very useful so spread out. But maybe
> try
> > one more night with the Ha filter and hypered tp.
> >
> > Sean Walker
> >
> > Jim Janusz wrote:
> >
> > > Hi Sean,
> > >
> > > I don't agree, as the film is black to the edges. I don't think there
> is
> > > anything that can do this during an exposure except a light leak of some
> > > sort. If it were just over exposed it would only be in the frame of the
> > > exposure.
> > >
> > > Jim
> > >
> > > ----- Original Message -----
> > > From: "Sean Walker" <vze2c3z8@verizon.net>
> > > To: <astro-photo@seds.org>
> > > Sent: Tuesday, December 11, 2001 3:21 PM
> > > Subject: Re: [APML] Black Negs a new developement
> > >
> > > > Thats your problemif you did long exposures. Hypered TP loves LP- it
> soaks
> > > it
> > > > up.
> > > >
> > > > Sean Walker
> > > >
> > > > Brian Sledz wrote:
> > > >
> > > > > Light Pollution??? oh yeah. 30 miles west of Chicago. Best nights
> mag
> > > 4.5
> > > > > overhead, to the east mag 2, west mag 4.2ish. But I have new
> insights.
> > > I
> > > > > took e200 with the Lumicon h alpha filter last night. I went 40 30
> and
> > > 20
> > > > > minutes. I got a nice California nebula at f4 in only 20 minutes.
> > > > > Brian
> > > > > ----- Original Message -----
> > > > > From: "Sean Walker" <vze2c3z8@mail.verizon.net>
> > > > > To: <astro-photo@seds.org>
> > > > > Sent: Tuesday, December 11, 2001 2:58 PM
> > > > > Subject: Re: [APML] Black Negs a new developement
> > > > >
> > > > > > Arre you shooting this hypered techpan in light pollution?
> > > > > >
> > > > > > Sean Walker
> > > > > >
> > > > > > > From: "Brian Sledz" <brianhome@email.msn.com>
> > > > > > > Reply-To: astro-photo@seds.org
> > > > > > > Date: Tue, 11 Dec 2001 11:57:39 -0600
> > > > > > > To: <astro-photo@seds.org>
> > > > > > > Subject: Re: [APML] Black Negs a new developement
> > > > > > >
> > > > > > > Hi Jerry,
> > > > > > > No but in this case it was 35mm, last week's black negs were 120
> > > without
> > > > > > > sprockets. ;-]
> > > > > > > Brian
> > > > > > > ----- Original Message -----
> > > > > > > From: "Jerry Lodriguss" <jml@astropix.com>
> > > > > > > To: <astro-photo@seds.org>
> > > > > > > Sent: Monday, December 10, 2001 2:30 PM
> > > > > > > Subject: Re: [APML] Black Negs a new developement
> > > > > > >
> > > > > > >
> > > > > > >>
> > > > > > >>>
> > > > > > >>> Yep the negs are black out to the sprockets. But I used a
> > > changing
> > > > > bag
> > > > > > > plus
> > > > > > >>> a dark room this time. Light leak???? hmmm. I just got back
> some
> > > > > e200 I
> > > > > > >>> shot with same set up and they are ok. And I had the
> viewfinder
> > > off
> > > > > the
> > > > > > >>> camera. So I doubt the 6x7 Pentax is leaking.
> > > > > > >>
> > > > > > >>
> > > > > > >> 6x7 film doesn't have sprocket holes does it?
> > > > > > >>
> > > > > > >>
> > > > > > >> Jerry
> > > > > > >>
> > > > > > >> Astrophotography, Tips and Techniques
> > > > > > >> for Digital Enhancement in Photoshop:
> > > > > > >> http://www.astropix.com
> > > > > > >>
> > > > > > >> -- APML Archives at <http://astro.umsystem.edu/apml/> ---
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> > > > > > >>
> > > > > > >
> > > > > > >
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