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[OM] Re: Lanscape's via PC stitching, was: Zuiko 18mm and 21mm

Subject: [OM] Re: Lanscape's via PC stitching, was: Zuiko 18mm and 21mm
From: "John A. Lind" <jalind@xxxxxxxxxxxxx>
Date: Fri, 15 Apr 2005 13:03:50 -0500
At 09:26 AM 4/15/2005, you wrote:

>To my mind there is not much fiddling with the Zuiko Shifts, given that they
>are to be mounted on a tripod (as they would be for Chuck's suggested

I've done both and there is less fiddling with a shift lens.  It gives a 
perfect, seamless, rectilinear image.  The rotation method does not 
perfectly lash images together; it requires some stitching software to join 
the two together and create a cylindrical or spherical mapping of the 
rectilinear images.  The fiddling required when using rotation is setting 
the axis of rotation directly through the rear lens node.  Its location is 
not only different for each lens, it can also be difficult to determine 
exactly where it's located unless there's an optical bench handy on which 
its distance from the lens mounting flange can be precisely 
measured.  There is a field method for doing this that enjoys some amount 
of success, but it also requires considerable fiddling with exact position 
of the camera on the tripod (relative to the rotation point).  Furthermore, 
this requires a pair of sliding plates orthogonal to each other between 
camera and rest of tripod head to allow adjusting camera position with two 
degrees of freedom.

OTOH, the shift lens method has considerable overlap between full left 
shift, center and full right shift, and with the 35/2.8 shift it results in 
about the same horizontal field as achieved with a 24mm lens (IIRC, about 
90 degrees).  Nevertheless, it is a nifty method for making triptychs by 
cropping the left and right slightly from the center image, and then 
cropping much of the right off the left image, and much of the left off of 
the right image.  How much must come off of these two depends on center 
image crop, and the spacing between the three when they're mounted (one 
should plan the presentation of the three *before* doing the cropping).

Also, IIRC, the 35/2.8 does have slight overlap between full left and full 
right shift and a diptych could easily be made from just a full left and 
full right shift.  Not having used a 24mm shift I can only presume it 
similarly overlaps; someone who has one can verify this.  I've never been 
much a fan of diptychs though; the triptych with a center image seems more 
natural when looking at the entire work.

-- John

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