From SIGMA:
We would like to share the results of our investigation regarding the operation of SIGMA’s lenses for Canon EF mount when used on the Canon EOS R5.
We have verified the operation with our SIGMA GLOBAL VISION (SGV) interchangeable lenses (Contemporary, Art, and Sports lines) for Canon EF mounts used on the“Canon EOS R5” with Canon’s mount adapter “EF-EOS R Series”, and confirmed that there were no problems with general operations such as AE, AF, and image stabilization.
Please note the following points when using our products.
- For SGV interchangeable lenses released before 2017*, it is necessary that the lens firmware is updated to Ver.2.00 or later. * The release year can be confirmed by the edition number (A017, C015, etc.) engraved on the lens barrel.Please refer to the following page for details of the lens firmware. https://www.sigma-global.com/en/download/lenses/firmware/
- After setting the Digital Lens Optimizer to [OFF], set the “Peripheral Illumination Correction”, “Chromatic Aberration Correction”, and “Distortion Correction” of the “Lens Aberration Correction” function to [ON] to achieve the appropriate corrections in accordance with the optical characteristics of each lens.
- AF can be used within the area of approximately 80% of the height and 80% of the width of the sensor surface.
- For lenses without an OS (Optical Stabilizer) mechanism, the in-camera image stabilization can not be used when the Full-time MF setting is set to “Full- time MF ON” via SIGMA Optimization Pro. When using in-camera image stabilization, please set the Full-time MF setting to “Full- time MF OFF”.* The default Full- time MF setting is “Full- time MF OFF”.
- Image stabilization does not work optimally with interchangeable lenses which are not from the Contemporary, Art, or Sports line. Please turn off the camera’s Image stabilization setting, or turn off the OS switch for lenses equipped with an OS (Optical Stabilizer) mechanism when using.
- For interchangeable lenses which are not from the Contemporary, Art, or Sports lines, using MF is recommended, since it may be difficult to achieve sufficient focusing speed and accuracy when AF is used.
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8-16/4.5-5.6 (Crop): Serious IBIS problems, the R5 amplifies any shake. It seems to do the opposite of what it should do. In crop mode with IBIS disabled it does work fine though.
Can anyone comment on/ refute that?
Samyang/Rokinon already have a few primes out for the mount and I know at least one of them has AF. I'd be surprised if Sigma didn't announce something by the end of next year.
For pretty much the same reason why canon releases native rf lenses: size, image quality, convenience, sales.
I think it has to be cost effective, when you're business is selling lenses for other people's cameras!
I think its just taking time. To get full use of the RF system they have to reverse engineer a lot and it will take time. The cheaper manufacturers like Samyang can skip a lot of that, go MF or otherwise be more rudimentary at their price point, but Sigma is trying to be a viable alternative to manufacturer glass (Canon,Sony, etc). So they probably decided to take the time to get it worked out and release stuff only when they have a true native package.
They can certainly still share optical formulas between platforms, with body/mount changes in order to get them to work with the varying communication protocols and flange distances.
I love this lens. I rented one last year for a road trip and had a lot of fun with it once I got used to the size and weight. 960mm on a crop body
Hoping sigma come out with something like this in RF
I think most people would prefer them to release the DN Art lenses in RF mount and not the EF Art with basically fixed adapters attached. The optics, AF and size of the DN Art lenses is much better than the EF Art lenses,