When you use Photoshop or other software to correct perspective because you didn't shoot the shot correctly in the first place, one of two things will happen...
either:
the photograph must be "stretched" to perform the correction necessitating the synthesis of pixels (information) not in the original shot, leading to a photo where some scene details are (essentially) the computer's best guess.
or:
the photograph must be "compressed" to perform the correction necessitating the loss of pixels (information) that were in the original shot, leading to a photo where some scene details are (essentially) lost.
A shift lens eliminates both of these conditions by performing the correction as a mater of photographic geometry when the image is formed.
This has got to be at least the tenth time this subject has come up in the last several years.
Regards, Bob...
From: "David Oswald" <[EMAIL PROTECTED]>
I just noticed a 28mm Pentax shift lens on eBay. I've always wondered about this lens (but not enough to shell out the cash). It seems that nowadays, in the digital age, a shift lens *may* be one of those things that has become obsolete. Are they still getting use like they did "back in the day"?
Just curious...
(the auction is listed at http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3879943336 )
Dave
