Keith over at Northlight Images has uncovered some optical formulat patents for lenses that are likely to arrive over the next year or so. One being an RF 11-24mm f/4L, which is definitely needed in the RF lineup. A Canon RF 10-24mm f/4L has been on our roadmap for quite some time.
The second is a zoom fisheye lens that builds off the Canon RF 8-15mm f/4L USM. The optical formula in the patent is for a Canon RF 8-24mm f/4L USM, which sounds like a very cool lens. As with the EF version of the zoom fisheye, it will work as a circular fisheye on a full-frame sensor and as a ‘normal' fisheye on the crop sensors found in the Canon EOS R7 and Canon EOS R10.
Canon 11-24mm f/4L USM optical formula
- Focal Length: 11.33mm – 23.30mm
- F-Number: 4.08
- Half Angle of View: 59.63° – 42.88°
- Image Height: 21.64mm
- Entire Lens Length: 135.40mm – 130.90mm (front element to image sensor)
Canon 8-24mm f/4L USM optical formula
- Focal Length:
- F-Number: 4.08
- Half Angle of View:
- Image Height: 21.64mm
- Entire Lens Length:
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Still hoping Canon will produce an UWA fast prime or zoom for astrophotography. 14 mm or wider and f 2.8 or faster. This has been a missing element of the Canon lens lineup forever. At least in EF mount Sigma and Rokinon filled the gap. Would be nice to have a native RF mount option. If it is not to be, I will continue to adapt my EF lenses.
Bob
So at least a 14mm F1.8 or something similar. I’m hoping for a 12mm F2. That’d be awesome. i believe tjis lens could come because the UWA zooms have become wider. I also believe the RF 10-24mm will be released and it’llweigh a lot less than it’s EF version.
The RF 11-24/4 lens in this patent, assuming it has a built-in hood like the EF version, seems to be only <1 cm shorter than the EF version. It does appear the RF lens will have smaller diameter front element groups, and since that’s a big chunk of glass the RF version will likely be much lighter.
That also suggests some reliance on digital corrections as seen with the RF 14-35/4L.
Also, from a practical standpoint that location on the barrel is where you find things like the zoom and focus rings. Seems unlikely that Canon would make a zoom ring or focus ring really skinny to accommodate a drop in filter.
This patent design may not be the one to become a product. But if it is, it won’t feature a drop in filter. You seem insistent on highlighting the possibility of including one. I’m not disputing the possibility, I’m just saying this patent design is not going to give you what you hope for.
Maybe we will get a non-L UWA lens.
I purchased the EF Canon EF 8-15mm f/4L Fisheye USM Lens because as today, there is NOT in the market a sort of real fisheye (circular effect lens) for my R5 full frame lens.
However I have found out that when I use this EF fisheye lens as 15 degree, I get similar view as the RF 15-35. When I move to the 12-8mm area, the image get distorted (which is what I like) BUT I also get a lot "crap"/unwanted things at the edges... In essence the lens get part of the edges of the lens within the image itself, which is of course horrible.
I guess the reason is because this lens works best on APSC sensor, while with full frames you do not get real and clean 180 degree image. Am I correct???
Will be the RF 11-24mm f/4L able to provide a fully "clean" 180 degree image on my FF R5 without seeing any unwanted object in the image?
For atrophotography I wish there was in the market something around 10-12mm f2,8 even manual focus as my RF 15-35mm f2,8 sometimes is not too wide)....
But if I'm being honest I'd prefer more range on the wide end.
Canon hasn't converted the FD 7.5mm f/5.6 to EF, and never made a fisheye in EF-S. Apparently fisheyes are too niche, which is why Canon covered it with one zoom lens.
On FF, 11mm has an angle of view of 125 degrees.
For a rectilinear lens to have a 180 degrees image, its focal length must be 0mm. Don't hold your breath waiting for one.
Its the 11-24mm which will have a 125 degree image.
1. vignetting,
2. NOT getting part of the circular lens at the edge of the image, when I am focal at a focal length of 10-12mm???