Originally posted by RonHendriks1966 Good to bring it up, since I only thought of the tilt/shift lens after I put up the poll. Put it in the first message. You say 18mm, but I also see 35mm and more? I'm not aware off wich to choose, but is wide-angle the way to go?
I would say so, mainly because of (Tilt/)Shift architecture. The classic offering for this was the K28/3.5 Shift (not tilt!), so I would expect an APS-C equivalent FOV in the new Pentax offering, hence 18mm. Tilt is not so important because of the large DOF you can typically expect at such focal lengths.
I have the K28/3.5, and whereas this is a nice lens to use in some cases, it's not very flexible. The longer the focal length, the less important the Shift becomes (because of perspective flattening) and the more important Tilt on the other hand (because of the reducing DOF). Hence I don't see 35mm and longer Tilt/Shift lenses as architecture lenses. They are more suitable for technical product photography or for creative effect.
Anyway, the longer focal lengths exist from third parties (I have the Hartblei 65mm Super Rotator), the shorter just don't exist.
Originally posted by RonHendriks1966 Is it possible to make a Converter style tilt/shift to put between camera and lens so you can put on just any lens in your bag? Or am I just thinking off something that wouldn't work?
An adapter would be nice of course, but that would require glass to compensate for the increased registration distance in order to keep focus to infinite, and hence lengthen the focal length of the lens mounted by at least 1.4x I would think. So even if you would mount say a DA15, this would become a 21mm lens, i.e. a moderate wide angle only.
Anyway, I don't think the image circle of the DA lenses would allow shifting and tilting without vignetting. Perhaps FA and older glass could work though, but these are in even longer focal lengths. Current existing adapters are for Medium Format glass, and those are simply not available in focal lengths that are even remotely close to wide angle on APS-C.
Wim