Re: [APML] Astro camera

["Steve Walters" <swalters@att.net>]

Mike,

According to Jim Janusz and a few others, it is not necessary. In the
archives, you can find notes on this. There was a time when the paper
backing caused mottling of the film. Apparantly something in the paper would
interact with the emulsion while hypering creating blotches and spots. But
Kodak changed the paper during 1999 (?? see archives, the date is there) and
there is apparantly no problem with the new backing. I'll be testing this
during september.

Steve...

swalters@att.net
http://astrophoto.home.att.net

----- Original Message -----
From: Michael Cole <mrcolewa@home.com>
To: <astro-photo@seds.org>
Sent: Saturday, September 01, 2001 12:49 AM
Subject: Re: [APML] Astro camera


> Steve,
> Just curious. For Tec Pan do you not have to remove the paper on 120
> film to properly hyper it?
> Mike
>
> Steve Walters wrote:
> >
> > Brian,
> >
> > We'll definitely connect at the BRSP. I hope to arrive either thurs nite
and
> > stay until the following tues or wed. I'll have the BRC and 6x9 with me
for
> > sure. I'll be in a large conversion van. I'm about as big around as the
van
> > but not nearly as tall  ; )
> >
> > It turns out that you do not have to remove the paper anymore for
hypering
> > TechPan, it does fine without unrolling it. That was a factor in my
decision
> > also to go for the regular 120 back.
> >
> > See 'ya out there.
> >
> > Steve...
> >
> > swalters@att.net
> > http://astrophoto.home.att.net
> >
> > ----- Original Message -----
> > From: Brian Roth <broth@heathers.stdio.com>
> > To: <astro-photo@seds.org>
> > Sent: Friday, August 31, 2001 5:11 PM
> > Subject: Re: [APML] Astro camera
> >
> > > Steve,
> > >
> > >     Great stuff. Thanks for the reply. As far as the 220/120 decision,
> > I'll be
> > > rolling it on a stainless reel for hypering anyway but I do see your
point
> > about
> > > the possibility of film damage. I'll be at Cherry Springs as well.
Maybe I
> > can
> > > find you in the mass and check out your setup. Unfortunately, I'll
> > probably just
> > > have my LX 200 with me unless I can adapt an old OAG from Meade onto
the
> > TAK for
> > > some 35mm work. Haven't ordered the camera yet. From what I have seen
it
> > looks
> > > like a go.
> > >
> > >    I was @ Cherry Springs last weekend but Sat was a bust weather
wise. I
> > heard
> > > there is 400 pre registered for the star party. I hope to get there
the
> > Thu
> > > night before. I'll have a tan/brown Toyota/Dolphin motor home with NY
> > plates and
> > > cheesy looking K-mart hubcaps. Look me up.
> > >
> > >    Thanks for the link as well. I love that BRC250. Nice pics of an
actual
> > > setup.
> > >
> > > Thanks again,
> > > Brian.
> > >
> > > Steve Walters wrote:
> > >
> > > > Brian,
> > > >
> > > > I have just recently received this camera but I did not go for the
vac
> > back.
> > > > I bought a regular Horseman 120 back and added a purge fitting. I
> > decided
> > > > against their vac back because you MUST use 220 film in it or 120
film
> > with
> > > > the paper removed. Since TechPan is not available in 220 format, I'd
be
> > > > taking the paper off. This gives ample opportunity for scratches,
finger
> > > > prints, blobs of sweat, etc so I really don't want to do that. Since
> > I've
> > > > shot 6x7 with no flatness problems, I decided to try the 6x9 with a
> > regular
> > > > film back. I'm sure it's not as flat as the vac back but it's a lot
less
> > > > expensive ($335 instead of $880). Also, Ted Ishikawa at Hutech told
me
> > they
> > > > would convert my regular back to a vac back for a reasonable price.
So
> > if I
> > > > have a problem, there's a way out.
> > > >
> > > > The camera has a beautiful and precision machining job. The focuser
is
> > very
> > > > well built and a friend has their 35 mm focuser which is the same
basic
> > > > design. His works very very well. As Gene said, you do have to use
the
> > hat
> > > > trick but this is not much of a drawback. I also bought their
eyepiece
> > > > adapter so I can check alignment of the OTA with my eFinder. I plan
to
> > frame
> > > > images using the STV/eFinder so the lack of a viewing port doesn't
> > bother me
> > > > but it may prove to be an inconvenience. I was using a Pentax 6x7
and
> > was
> > > > used to framing images using the Pentax rigid magnifier hood. If I
must,
> > > > I'll use the eyepiece adapter but I'm hoping the eFinder will work
out.
> > But
> > > > for some folks, the lack of a viewing port may be an issue.
> > > >
> > > > I don't have any results with it yet, maybe after this next dark
cycle.
> > I
> > > > plan to do a test of it in the front yard sometime after full moon
next
> > > > week. My front yard is the light pollution capital of the universe
(I
> > live
> > > > in NJ) so I doubt I'll post any images from the test. But if you're
> > anxious,
> > > > we could correspond about the camera after I do some tests. I'll be
> > going
> > > > out to Cherry Springs PA which is my favorite dark sky site during
Sep
> > to
> > > > image.
> > > >
> > > > I'm not using the OAG but a friend in Japan uses it and loves his.
He
> > does
> > > > say the OAG vignettes a little bit on the 6x9. Nothing serious he
sez
> > but
> > > > there is some vignetting. I use a guidescope so the OAG isn't for
me. My
> > > > friend has a website at
> > http://www.seaple.icc.ne.jp/~w-taka/eguidesys.htm
> > > > His name is Takayuki Watanabe. I started corresponding with him a
couple
> > of
> > > > years ago when I was considering the BRC OTA. He has some images of
his
> > > > system with the OAG. He's been published a good bit in Temmon Guide
and
> > Sky
> > > > Traveler (Japanese astronomy magazines).
> > > >
> > > > Steve...
> > > >
> > > > swalters@att.net
> > > > http://astrophoto.home.att.net
> > > >
> > > > ----- Original Message -----
> > > > From: Brian Roth <broth@heathers.stdio.com>
> > > > To: <astro-photo@seds.org>
> > > > Sent: Friday, August 31, 2001 7:47 AM
> > > > Subject: [APML] Astro camera
> > > >
> > > > >
> > > > >
> > > > >    Does anyone on the list have any experience with the Mitsuboshi
6X9
> > > > camera? I
> > > > > am looking at large format options and if I can swing the price,
this
> > > > looks to
> > > > > be quite an impressive setup. Specifically the OAG with nitrogen
purge
> > > > fittings
> > > > > and the 6X9 horseman vacume back. They also factory calibrate a
knife
> > edge
> > > > > focuser depending on the emulsion you use. This will all be fitted
on
> > a
> > > > TAK
> > > > > FSQ106.
> > > > >
> > > > > Thanks,
> > > > > Brian.
> > > > >
> > > > >
> > > > > --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
> > > > >              Unsubscribe at <majordomo@seds.org>
> > > >
> > > > --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
> > > >              Unsubscribe at <majordomo@seds.org>
> > >
> > >
> > > --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
> > >              Unsubscribe at <majordomo@seds.org>
> >
> > --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
> >              Unsubscribe at <majordomo@seds.org>
>
> --
> Michael Cole
> Urban Imager Astrophotography Website
> http://members.home.net/mrcolewa/interest.htm
>
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>