I got interested in this topic a few months ago. Two references I found:
http://www.cambridgeincolour.com/tutorials/tilt-shift-lenses1.htm
http://www.cambridgeincolour.com/tutorials/tilt-shift-lenses2.htm

I also found a couple of other lenses - this was the least expensive:

http://www.zenit-camera.com/mc-35mm-tilt-shift-lens-pentax.htm

I haven't pursued the topic because I decided that, for me, a tilt-shift lens 
would be like a fisheye. Both would be fun for a few days but I couldn't 
imagine a long term use. The tilt-shift probably more useful to me than a 
fisheye because of its ability to provide an expanded DOF for landscape. 
Thinking primarily of the classic field of flowers stretching away to the 
distance. Stopping down diminishes the ability to use faster shutter speeds to 
compensate for the breeze moving the flowers, so the tradeoff is to use higher 
shutter speeds, a stopped down lens, and higher ISO. Focusing stacking may work 
in this scenario, but the constant movement of the flowers (or other elements 
in the scene) makes this approach problematic as well. 

stan

On Dec 2, 2013, at 11:21 AM, CollinB wrote:

>> Besides, it's circular. Tilt-shift is mostly useful on film. With a
>> digital camera I can easily do perspective distortion in software.
> 
> A little reading will show you that there is a little more to shift than
> that.
> Still, I understand.
> 
> What might be better would be a technical camera where the mount shifts and
> tilts while the lenses stay in place.
> Like tilting the back of a LF camera.
> Might be difficult with the screw drive, but if Pentax/Ricoh goes for more
> DC motor drive lenses then it would have a future.
> 


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