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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: Fri, 16 Feb 2007 23:22:19 +0100
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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