Originally posted by slackercruster Any cheaper options or adaptations for something in the 20's. Pentax's 25 is pretty high priced.
Nope, the 35mm A is going to be widest 'cheaper' lens. You could consider getting a nodal slide and doing panos for a wider perspective...I understand that doesn't work in every situations, but it's much less expensive than the 25mm.
Check out the lens database here and you'll see what's available:
Pentax 645 Medium Format Lenses - Pentax Lens Reviews & Lens Database
One more option is getting the Pentax 67 45mm medium format lens (has a larger image circle since it's meant for 6x7 instead of 6x4.5) and the Zork Panorama Shift adapter...but that's not exactly cheap either, though with the 67 45mm should be less expensive than the 25mm. Once the files are stitched you'll have a much higher mp file than you would with the 25mm and shouldn't have any parallax issues. I believe they say it will give you approx equivalent of a 22mm wide (though I don't remember if that's on MF or 35mm format...which makes a big difference!)
http://www.zoerk.com/pages/p_psa.htm
Making panos isn't ideal for many situations (handheld, windy with grass/trees, waves, moving objects, etc.).