Originally posted by solitudebound More to do with the general purpose tilt shift adapters for Pentax k-mount. Canon has a nice t-s adapter for it's smaller lenses and it has a decent 17mm integrated T-S lens. Haven't seen much on this subject for Pentax in many years.
Usage is for general purpose landscape, buildings, e.t.c. The best IQ possible. Kind of expecting to pay 500$+ (CAD) for an adapter so it needs to be worth it. Also i like to do multi exposure at times with T-S as it can give you a kind of 3d feel to the image.
The sensor shift technique is ok but it's rather limited since most of the subjects i snap are outside the sensor shift range and the fact it's the sensor that is moving not the lens so it doesn't really help with paralax.
The Canon offerings work fine but they are far from the IQ of Pentax. No problem using the Canon T-S lens for video but for stills it's not good enough or worth buying a 5dMk4 just for that. I rent one.
---------- Post added 10-03-19 at 10:53 AM ----------
I explained above.
OK...given your explanation and the broad range of application, I suspect that an adapter will not address your needs, at least not on a K-mount camera, due to lack of ability to focus past a few meters and inadequate image circle unless used with medium format lenses. The absolute best option for the mix of both architecture and landscape would probably be the Schneider PC-TS Super-Angulon 28mm f/4.5. Unfortunately, this lens is no longer being made, but sometimes pops up used in Pentax-K and other SLR mounts ($$$$).
The Samyang options are OK (
Detailed PF Review) and some speak highly of the Ukrainian Arax 35/2.8 T/S. Again, at the high end, price-wise, is the Hartblei 40/4.0 IF TS Superrotator at € 5395...Zeiss optics and amazing movements, but oh, the price.
As noted above, the Pentax-K 28/3.5 Shift is the closest you will come with Asahi or Pentax glass, but no tilt. I would include the Pentax 6x7 75mm shift, but the focal length is limiting for small format.
FWIW, You may have noticed that I have not provided personal experience with any of these products. Several years ago I was pondering similar products and determined that the available options were sub-optimal. My solution was a 4x5 field camera and a scanner. If one wishes direct digital, would benefit from true Scheimpflug, and has very deep pockets a 6x9 Technikardan with digital back is the cat's pajamas.
Steve