Eventually we're going to see more affordable RF mount lenses from Canon and one of the obvious types of lenses they'll need is an affordable wide angle zoom lens.
Canon has published a patent for such a lens and others with the aim of making manufacturing easier, which also means less expensive.
Canon RF 15-28mm f/4-5.6 IS
- Focal length: 15.40mm-27.50mm
- F value: 4.00-5.60
- Half angle of view: 54.51-38.94
- Image height: 19.00mm-21.64mm
- Overall length: 103.50mm-103.50mm
- Back focus: 14.20mm
I don’t understand why this lens would be over 100 mm long.
(14 or 15 mm would be really nice but I wouldn’t expect that)
In other words, another optically compromised wide angle lens for RF from Canon that will be corrected in camera so you don't see how bad it is - just like the RF 14-35/f4L.
Can't wait to see some non-Canon RF wide angle lenses that hopefully aren't fucked by design like Canon's are.
I'm glad you are still loving the design of the 90D that is before the RF era.
The problem is when Canon produces lenses that generate images with severe problems, you aren't getting lenses that are cheaper (maybe lighter.) Look at the cost of the RF 14-35/f4L vs the 16-35 f/4L. 2mm wider, massive increase in distortion and a massive price increase but only 100g weight savings (the weight of a chocolate bar.)
With this lens, the suggestion is that the image circle doesn't cover the full frame and that's not a problem because in-camera electronics will just correct for the resulting vignetting and distortion. If the camera needs to boost the peripheral parts of the image by 2+ stops, there's no way that can't impact the final image quality. The better the quality of the input, the better the quality of the output.
With what is effectively MkI lenses for RF from Canon, photographers at the wide end are getting fucked over, pure and simple.
At least I can frame the image with the 90D without having to drain the battery.
The problem isn't the lack of a perfect lens, the problem is that Canon is pursuing lRF lens designs that have significant image quality issues that they're just hand waving away with software - and asking customers to pay more for the privilege of such lenses.
Anyway people who do not have EF lenses (or the RF15-35) and can afford it may as well buy it. I understand they will be happy with its IQ and they will soon forget how much they paid for it.
In the overlapping part of the zoom range, the RF 14-35/4 is optically quite similar to the EF 16-35/4. The RF lens offers an extra 2-2.5mm on the wide end, and it requires both more money and digital correction to get it.
I’m not sure if that offends you because you abhor digitally processing images, or because the higher cost of the lens is beyond your means. But for those photographers who use modern image processing techniques (which includes those shooting in-camera jpgs) and have the wherewithal to buy the lens, no one is getting screwed over.