Re: [APML] 35 mm Camera & Focuser

["Stuart Heggie" <stuart.j.heggie@sympatico.ca>]

Will do - thanks Serge!
Stuart
----- Original Message -----
From: "Serge Theberge" <serge.theberge@wti.on.ca>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Saturday, December 13, 2003 9:23 AM
Subject: RE: [APML] 35 mm Camera & Focuser


> Hi Stuart,
>
> You might want to consider the STI Stiletto Series IV for the Nikon.  You
> get both the knife edge and a 300-line Ronchi screen.  Very easy to use
and
> if the calibration is not perfect, it is easy to refine the calibration.
>
> Serge
>
> -----Original Message-----
> From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On
> Behalf Of Stuart Heggie
> Sent: Saturday, December 13, 2003 8:36 AM
> To: Discussion of Film Astrophotography
> Subject: Re: [APML] 35 mm Camera & Focuser
>
>
> Bradley, thanks for this. I actually have a DW-2 and it is GREAT for
> composition / framing but it is not so easy to focus with (and not
> recommended for this by experts I'd read so far). The trick with the DW-2
is
> you have too many variables first of all and its focus is very dependent
on
> your angle of view so stuff swims in and out of focus as you move your
head
> - not so easy. I sense from what I've read that the most success seems to
> come from people who are putting an eyepiece or loupe on the focus screen
> directly and studying the tightness of the star's image on the matte
portion
> of the screen. I think!
>
> For my camera lenses, I put a two-hole mask over the objective and then
took
> a series of 30 second shots, recording the focus position at each shot and
> slowly stepped through the range on each side of infinity and found
critical
> focus for the lenses that way. With prime focus, you have no way to lock
the
> scope down permanently (unless you never plan to look through it I guess).
>
> PS - don't be surprised if those DW-2's go for a lot more by the time the
> auction closes - they are fetching upwards of $200 typically.
>
> Stuart
> ----- Original Message -----
> From: "Bradley Hope" <bradley@thorngarden.net>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Saturday, December 13, 2003 7:28 AM
> Subject: Re: [APML] 35 mm Camera & Focuser
>
>
> > ----- Original Message -----
> > From: "Stuart Heggie" <stuart.j.heggie@sympatico.ca>
> > To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> > Sent: Saturday, December 13, 2003 3:04 AM
> > Subject: Re: [APML] 35 mm Camera & Focuser
> >
> >
> > > John, for those of us with cameras with removable pentaprisms, would
> this
> > > thing plunked directly down onto the focus screen work? I'm still
> shooting
> > > piggyback so I've focussed using the the Hartmann mask technique but
> when
> > I
> > > finally make the jump to prime focus, I think I'll need something
> > > better than what I've got.
> > >
> > > Anyone else, I've got two Nikon F2's so if there is another means
> > > that
> > works
> > > for sure on this camera, I'd love to know it - mostly what I read is
> that
> > I
> > > buy a loupe and file it down to fit into the top of the camera and
> > > rest
> on
> > > the focus screen - if I get one that is adjustable, is that better
> > > so
> that
> > I
> > > don't have to fine tune the filing job for height?
> > >
> > > Stuart
> >
> >
> > Stuart;
> >
> > I would suggest the Nikon DW-2 finder. It's 6X and has an adjustable
> focus,
> > full frame viewing of the focus screen. There are a couple available
> > on Ebay, both ending today, currently $27.50 and $99.00. There's
> > nothing
> wrong
> > with the one for $27.50 except it's missing the name plate.
> >
> >
>
http://search.ebay.com/search/search.dll?query=dw+2&catref=C3&socolumnlayout
> =3&lotr=1&from=R2&sacategory=625&BasicSearch=
> >
> > Bradley
> >
> > _______________________________________________
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> >
>
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