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I only make this comment as it is possible to probably use a lens that already has a shift function and made for EF mount and turn it into a TSR lens with a teist to tilt EF-L adpater is such device exists.
For S1R and L-mount, which we use for "serious" tasks, we won't bother. Canon has a complete line of well-respected TS-E lenses:
- TS-E 17 mm f/4L (2009, ±6.5° tilt, ±12 mm shift),
- TS-E 24mm f/3.5L (1991, discontinued),
- TS-E 24mm f/3.5L II (2009, ±8.5° tilt, ±12 mm shift),
- TS-E 45 mm f/2.8 (1991, discontinued, ±8° tilt, ±11 mm shift),
- TS-E 50mm f/2.8L Macro (2017, ±8,5° tilt, ±12 mm shift),
- TS-E 90 mm f/2.8 (1991, non-L, non-Macro, discontinued),
- TS-E 90mm f/2.8L Macro (2017, ±8° tilt, ±11 mm shift),
- TS-E 135mm f/4L Macro (2017, ±10° tilt, ±12 mm shift).
I believe that 2009+ versions are still produced in small batches. They are scarce and very pricey, as true as that is, and do not lose value being pre-owned. However, for (not-so-often) occasions when one is needed, it is available for rental. We have and often use good EF-to-L adapters, so no problems at all, everything is straightforward.
Purchasing a Canon TS-E for personal use (and even for "serious" tasks) seems unreasonable and unjustified to me, given its price and its occasional use.
(About Nikon TS lenses, I know virtually nothing; these are much less known and popular here, but I guess that they can be adapted to L-mount as well, and their prices are probably on par with Canon.)
However with the asking price of the TTArtisan TSR lens directly to L mount then "why bother?"
There is no reason to bother, I agree — the whole burden of third-party or vintage lens adaptation is rarely good for "serious" use, and, in my opinion, is not justified for personal hobby use either. If only I had some old 6x6, 645, or 6x7 lenses already in my disposal from a leftover old MF camera, then Ok, I'd throw some $200+ cash on a FOTODIOX T-S ROKR series adapter. But I don't own any, and have no intention to purchase any big old lenses - my drawer space is already scarce.
Given its price, the TTartisan Tilt-Shift 17mm F4 ASPH seems suitable for personal purchase, hobbyist use, experimentation, and self-training in T-S photography handicraft. This purchase will be (as always) a tradeoff, due to its shortcomings:
- For wide-angle photography (think creative landscapes, architecture, and interiors), a shift-only lens like the Laowa 20mm f/4 Zero-D Shift or the Laowa 15mm f/4.5 Zero-D Shift (both feature ±11 mm shift) may better meet all your needs, even without tilt capability (however, for a 2.5x price).
- A ±8 mm shift is only 2/3 of Canon's ±12 mm; this may become a sad limitation in certain conditions, such as tight spaces where you have no way to step out.
- For macro photography, a 17mm extreme-wide-angle FL is, umm... a questionable choice, and the TT lens itself doesn't offer macro capability. You'd go for a 90+ mm T-S Macro, and we are aware of Laowa 100mm f/2.8 Tilt-shift 1X Macro, and other counterpart options, aren't we?
So, my conclusion: I will give it a try for hobby use, experimentation, and self-training in T-S photography, focusing on three types of scenes only: creative landscapes, architecture, and interiors. If it's not satisfactory or rarely used, I'll sell it.