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I often shoot seascapes, using the 5DS R. I strive for a razor-sharp-everywhere look (from foreground corners to the horizon), beautiful light, and a large print.
Using live view, that camera body is spectacularly well-suited to the task. My favorite lens is the venerable 90mm TS-E. I like it especially because the image quality at F/5.6 is quite good, and because its field of view is sufficiently restricted to (often) fill the frame with the best light available. That match-the-lens-field-to-the-good-light ability is critical if you shoot toward the light, as I usually do. (It matters less if the light source is behind the camera.) Also, the improved f/stop flexibility (because tilt delivers depth of field at any f/stop) TS-E lenses can deliver is a great feature when shooting moving water, because it lets me choose a shutter speed to get the right look from moving waves and spray, in a broad range of conditions. So when nature delivers the right light, distributed optimally to match the field of the old 90mm TS-E, that camera body and lens combination is near-perfect.
Unfortunately, the 90 TS-E is no match for the more-recent wide TS-Es in terms of flexibility and ergonomics. The tilt control-knob in particular is too small for easy precision adjustment. And you have to choose to lock the shift capability either in line with the tilt, or perpendicular to it, with no freedom during a shoot (as on the newer TS-E lenses) to choose for both functions which orientations to use together.
It strikes me that Canon has an under-used market segment opportunity (for work like I do), which it could exploit using the 5DS R, its existing great live view technology, and tilt-shift lenses. It already leads the market in all those features. Why not expand, by adding new, updated TS-E lenses?
If Canon made them, I would buy updated TS-E lenses, with features and controls to match the 24mm TS-E, and image quality to match (or better) the 90mm TS-E, in the following focal lengths:
45mm;
65mm;
90mm;
120 mm;
160 mm.
That would give me a bag full of lenses to usefully match with a TS-E lens most light distributions which conditions present. That capability does not now exist anywhere. Canon seems to have all the technology in place now to deliver it. So that's what I want. If it would help keep the prices reasonable (the 24mm TS-E seems quite reasonable), I would be content with f/4 for all of them. If Canon could make an f/2.8 TS-E lens which delivered extreme sharpness and great contrast right into foreground corners, and all the way to the horizon, then so much the better. I would pay plenty for that, because many of my best opportunities are low-light.
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