In camera digital corrections known as DLO (Digital Lens Optimizer) It wasn’t until about 15 years later that DSLR’s were released and digital camera technology began to squeeze film technology out of the marketplace. Even though EF mount is very similar to RF mount in design and concept the theory around it was different as it was actually designed in the days of film. Why does the RF mount have more pins in the camera body and lens? This is why cameras like the EOS R5 are able to shoot at 20 frames per second in electronic shutter mode and still maintain excellent subject tracking while doing so. When shooting rapidly at 12-20 frames per second, the mirror spends most of its time moving in and out of the way, which means the mirror is severely limiting how well the AF can track a subject.īy taking the mirror out of the camera, not only is the relatively slow movement of the mirror eliminated from the equation, but the AF system is now able to function during more of the time before and after image capture occurs. Think about how the mirror-based AF works, when the mirror flips up, the AF shuts off, and it cannot turn back on until the mirror is brought back down and rested in position. The mirror and the systems bound to it, such as the old-style phase detect AF are a significant limitation in how fast the camera can operate. Getting rid of the mirror may seem like a minor thing but it is pretty major. Of course, in removing all that extra space the camera is made smaller, and in removing the mirror assembly and associated mechanical bits as well as the mirror-based phase detect AF system, the camera is made substantially lighter and less complicated. With EF mount one could remove the mirror but the larger distance between sensor and flange would remain from the old film days, therefore the first truly “digital” mount would have to be all new. A mirror is not necessary in modern digital cameras, so it has been removed, this is progress. One theory I have is that RF is the first “digital” lens mount for Canon. Why did Canon make a new mount for mirrorless? With the high quality of Canon RF lenses I think you can expect them to be quite popular with everyone including filmmakers just as the EF mount lenses have been for years. In addition to those the Cinema EOS C70, Cinema EOS R5C, and Red Komodo 6k are also able to use the new RF mount lenses. What cameras can use RF mount lenses?Ĭurrently, the EOS R10, EOS R7, EOS R, EOS RP, EOS R6, ESO R6 mk II, EOS R5, and EOS R3 are the stills cameras that use RF mount. However, RF mount lenses cannot be used on EF mount at all at the moment. Canon’s standard EF to RF adapter is only $99 and works reliably. They’re widely available and pretty cheap. Thankfully, EF and EF-S mount lenses can be used on RF mount with an EF to RF adapter. In addition to different physical design of the flange which prevents the lenses from being mounted directly on a different mount, there are some other differences such as the number of electrical pins that make a connection between the lens and camera body. While EF and RF mount are similar, they are not interchangeable. Can lenses from one mount be used on the other mount? RF mount is the new mount from Canon that is used on their lineup of full frame mirrorless cameras.ĮF mount is the older mount used by Canon in their Film SLR and Digital DSLR cameras (cameras with mirrors in them).
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