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Re: [APML] Medium format camera [and piggyback]
Phil - I think the 35mm panorama is EXCELLENT! I have never had the nerve to
try stitching pics together. Will have to tackle that in the next year.
Thanks!
Stuart
----- Original Message -----
From: "Phillip Jones" <starfest@comcast.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Sunday, November 09, 2003 12:10 AM
Subject: Re: [APML] Medium format camera [and piggyback]
> Hi Jose...here are my photos using the Mamiya 150mm f/2.8 lens.
>
> http://www.ruckuseffect.com/astro/mamiya645_piggyback.html
>
> I am too new at this astrophotography thing (I started in May) to know if
> these photos represent vignetting. However, when I attempted to align them
> for a mosaic, I failed because the stars were more spread out on the edges
> than their matching counterpart in the center of the next frame. My theory
> on this is the lack of field flatness in the Mamiya 150mm lens. In May I
did
> a mosaic with 3 photos of the exact same area using a Nikon F3 with the
> Nikon 105mm f/2.8 micro lens, which has a built-in field flattener. The
> mosaic fit nicely (thanks to Jason Ware for his assistance):
>
> http://www.ruckuseffect.com/astro/milkyway.html
>
> -Phil
>
> ----- Original Message -----
> From: "Jose Miguel Benito Huete" <jbenito1@teleline.es>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Sunday, November 09, 2003 2:03 AM
> Subject: Re: [APML] Medium format cameras (was:Tak. FSQ-106 for
> mediumformatfilm?)
>
>
> > Phil, I have a Tak FS102 and a Pentacon six medium format camera. So far
I
> have
> > used the camera with different lenses as a piggyback system (180mm and
300
> mm)
> > and it looks like the film is not completely flat on the film plane
since
> stars
> > at the edges of ths frmae are differentially affected by distortion. I
> guess it
> > is very difficult to maintain a 6X6 frame on the same plane during the
> > expossure. Also, with this camera some of the frames are juxtapossed. Is
> this a
> > flaw of all medium format cameras. I am going to move to a Kiev 88CM
model
> now
> > and don't know if this is going to improve things.I have done a custom
> adapter
> > for the Tak F102 and have shot a couple of frames at f8 with the
Pentacon.
> They
> > were good but there was some vignetting. Have you also observed
vignetting
> with
> > the Mamiya? Finally the method I use to focus is to previously make a
> focus
> > test usinf a calibrated paper bar attached to the focuser of the
telescope
> and
> > therafter that using that fixed position for all the shots. What do you
> think of
> > this particular method?
> > Many thanks
> > Jose Miguel Benito
> > Madrid
> > Spain
> >
> > Phillip Jones escribió:
> >
> > > Alan,
> > >
> > > Takahashi makes an adapter for the Mamiya 645 to work on the FS-102
and
> > > FS-128. I attach my Mamiya 645 1000s to my FS-128 both with and
without
> the
> > > Takahashi focal reducer. I also did this when I had the FS-102.
> > >
> > > There are several Mamiya 645 bodies to choose from. The biggest
> advantage to
> > > using the 1000s body is it contains a mirror lock. The only other
Mamiya
> 645
> > > body that has the mirror lock is the current model, the 645e. I have
> this
> > > body as well. The disadvantage to the 645e is the prism is not
> removable,
> > > where as it is removable on the 1000s.
> > >
> > > The 1000s is no longer made, but KEH.com usually has a good selection.
> That
> > > is where I purchased mine.
> > >
> > > You can see photos I've taken, as well as my 645 1000s attached as
both
> a
> > > piggyback camera and as a prime focus camer to my FS-128 on my site:
> > >
> > > http://www.ruckuseffect.com/astro
> > >
> > > My biggest challenge with the Mamiya is focusing. The 2x diopter I
> purchased
> > > for the 1000s helps, but I still am off a little. Gene Horr suggested
I
> use
> > > the Takahashi FM40 or FM60 (I just purchased the FM60), place it on
the
> > > focusing screen (after your remove the prism) and focus. I have also
> > > heard--and I'm going to try it--that you can use the FM40 or FM60 with
a
> > > piece of ground glass, and place the glass where the film plane is. Of
> > > course, this will work only for the first photo, or if you have a 2nd
> body,
> > > which I have. Should you choose to do this, you can buy a cheap body
> from
> > > KEH.com for this purpose.
> > >
> > > Let me know if you have any further questions.
> > >
> > > -Phil
> > >
> > > ----- Original Message -----
> > > From: "Alan Voetsch" <critter12952@yahoo.com>
> > > To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> > > Sent: Saturday, November 08, 2003 2:25 PM
> > > Subject: [APML] Medium format cameras (was:Tak. FSQ-106 for medium
> > > formatfilm?)
> > >
> > > > Hey all,
> > > >
> > > > The discussion between Dean and Kirk has gotten me thinking about
> > > > moving up to a medium format camera. Actually I've thought about it
> > > > many times, but I only now have an instrument that can utilize MF.
The
> > > > Tak FS-102 will be able to handle that format and once I'm
comfortable
> > > > with it and the new G-11 with Gemini, I would consider trying a
bigger
> > > > format camera.
> > > >
> > > > What I would like to know is if anyone has a tutorial, or such on
> their
> > > > website regarding this. Or barring that, can anyone give any
pointers
> > > > on what to look for in such a camera. The reason I ask is that I saw
> > > > one advertised on astromart last week that had a purge system
already
> > > > installed. This camera had been used on a 102 and I assume that the
> > > > user knew what he was doing. My assumption has always been that a
> > > > camera body is basically just a film holder. I'll qualify that by
> > > > saying that I would probably also use it for piggyback shots.
> > > >
> > > > All things being equal, is the camera manufacturer important here?
Are
> > > > there certain things to look for? To avoid? Is a Pentax 67 the wise
> > > > choice in the long run?
> > > >
> > > > What I really want is to be pushed in the right direction so when I
do
> > > > have the cash for such a purchase, I hace done my homework and can
> jump
> > > > on it then without screwing up. At that point, I would like to know
of
> > > > any adapters, etc... that would be necessary. Any guidance would be
> > > > much appreciated.
> > > >
> > > > Thanks,
> > > > Alan
> > > >
> > > >
> > > > __________________________________
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