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[OM] Re: Not exactly sure what it is (my german isn't very good) and it

Subject: [OM] Re: Not exactly sure what it is (my german isn't very good) and it looks interesting
From: "Frank Wijsmuller" <Frank@xxxxxxxxxxxxxx>
Date: Sat, 17 Feb 2007 10:06:52 +0100
Thanks for the info and what a beautiful shot!

Frank.

2007/2/16, Walt Wayman <hiwayman@xxxxxxx>:
>
> I've used the 135/4.5 on a old 6x9 Speed Graphic (have to have something
> with a focal plane shutter), and it covers the full frame. I don't think any
> of the others will, though.
>
> http://home.att.net/~hiwayman/wsb/media/192375/site1156.jpg
>
> Walt
>
> --
> "Anything more than 500 yards from
> the car just isn't photogenic." --
> Edward Weston
>
> -------------- Original message ----------------------
> From: "Frank Wijsmuller" <Frank@xxxxxxxxxxxxxx>
> >
> > At http://kurt-loeper-fototechnik.de/demoware.htm is an "Olympus
> universal
> > bellows" for sale (many other items on that site too).
> >
> > There is a claim (in German) that the Zuiko macro-heads could be used on
> > Hasselblad camera's, and that their imagecircle is big enough for
> 6x6....
> >
> > Any knowledge on the list about the truth of that claim?
> >
> > Frank.
> > .
> >
> > 2007/2/16, Jeff Keller <jeffreyrkeller@xxxxxxxxx>:
> > >
> > >
> > > With macro the DOF can be very small. The goal would be to get the
> > > whole bug in sharp focus rather than just his eyes. Frank's
> > > description of the fence going from near to far is a good way to
> > > visulaize it, but the problem is even more common with macro.
> > >
> > > Many of the bellows macro lenses have short focal lengths (Zuiko 20mm
> > > & 38mm). Stopping down the aperture very much causes diffraction
> > > problems. Although the Zuiko 135/4.5 can be stopped down to f45,
> > > diffraction probably limits the picture quality at f16 and beyond.
> > >
> > > For either tilt or shift you need a larger than normal image circle. I
> > > haven't seen a good macro lens with the necessary image circle.
> > > -jeff
> > >
> > > On 2/16/07, Frank Wijsmuller <Frank@xxxxxxxxxxxxxx> wrote:
> > > >
> > > > One of the reasons is the possibility of increased DOF by tilting
> camera
> > > and
> > > > lens relative to each other:
> > > >
> > > > http://en.wikipedia.org/wiki/Scheimpflug_principle
> > > >
> > > > In short Scheimpflug says that if the lines through object, lens and
> > > film
> > > > (sensor ;-) plane intersect at one point, the object will be in
> focus
> > > (hope
> > > > my English is correct here)
> > > >
> > > > In a C*n*n brochure they always illustrated this by a fence which
> > > appeared
> > > > completely sharp, but was not parallel with the film plane.
> > > >
> > > > A bigger image circle might come in handy for the shift, maybe for
> the
> > > tilt
> > > > too.
> > > >
> > > > Frank.
> > > >
> > > >
> > > > 2007/2/16, Scott Peden <scotpeden@xxxxxxxxxx>:
> > > > >
> > > > >
> > > > > Sorry for the dumb question, but what is the purpose of a shift
> > > bellows? I
> > > > > think I have read all the links and all I got out of this was that
> it
> > > was
> > > > > hard to find a lens or attach your camera.
> > > > >
> > >
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> > >
> >
> >
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>
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