Originally posted by BostonUKshooter ...………..A 20-23mm rectilinear would be nice. Put it in a tilt-shift barrel and own the world. Of course, you’d have to own the world to be able to afford it. It needs to be wider enough than 28 not to compete with the 28-45.
Interesting that Hassy have just released their new 21mm rectilinear for the X1D...I wonder if they will eventually do an HTS type tilt/shift converter to go with it?
Doubtful. They would insist that the sorts of corrections that can be made using shift can be done in software, and that their lens is won't deliver the expected performance if tilted. Tilt in particular requires that the lens cover a significantly expanded image circle, and (Hartblei notwithstanding) the best lenses with movements were designed for the larger image circle to begin with.
Pentax already has a lens design that can do this, though it would need to be tweaked to be just a bit shorter. But the manufacturing difficulties are not insignificant, which is the reason they don't make that lens any more. That's why they would own the world--it's hard to do and they will likely not have competition. But that's also why it would cost the world to buy one. I would guess it would be a challenge to be profitable with a proper 21mm lens in a tilt-shift barrel at a price point of $10,000, and I'm not sure that's a price that fits with Pentax's brand image.
People want everything. They want a lens that will resolve a 50 or 100MP sensor at wide apertures, with motion control (requiring some elements that are gyro-controlled), fast autofocus (requiring a lightweight internal focus group), close focusing (requiring floating elements), with minimal fall-off (which requires a rectilinear design even if mounted on a short-flange mirrorless camera), weather sealing, professional ruggedness (made more difficult by all those moveable bits), light weight, reasonable filter capability, extremely short focal length, a smooth and tight focus ring, and a cheap price. This is simply unrealistic.
But we already hear the complaining when Pentax charges $4600 for a new 28-45, which is by all accounts a world-class lens with all the features. Hey, stuff is expensive. Even if Pentax came out with an extreme wide in a tilt-shift barrel, who could afford it? I'm not sure Ricoh is willing to have loss leaders at that level.
Rick "medium format has always been expensive" Denney