The EF-M 32mm f/1.4 and EF-M mount Sigma 30mm f/1.4 would provide significantly better image quality than you 50mm STM on any speedbooster. Pretty much any EF mount 35mm lens on a standard adapter would be better too. The 50mm STM is quite soft wide open and the corners get even worse on a speedbooster.
It may help to understand "why" there are both EF vs. EF-S lenses and it has to do with making cameras economically more affordable so that more consumers can buy them. EF lenses are the original EOS lenses designed for 35mm film cameras and full-frame digital cameras (a "full frame" digital camera has a sensor which is the same size as a It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject. Has rounded aperture blades. Canon EF 50mm F/1.8 STM. Canon EF-S 18-55mm F/3.5-5.6 IS STM. Similar to the number of aperture blades, rounded blades affect the way the light gets through to the sensor.

It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject. Has rounded aperture blades. Canon EF 75-300mm F/4-5.6 III USM. Canon EF-S 55-250mm F/4-5.6 IS II. Similar to the number of aperture blades, rounded blades affect the way the light gets through to the sensor.

EF-S LENS. EF-S stands for Electro-focus short back focus. This Canon lens mount was launched alongside the EOS 300D (EOS digital Rebel) camera in 2003. EF-S lenses have an image circle which just covers the sensor of APS-C cameras, meaning that the image circle is smaller in size than in EF lenses. EF-S lenses also sit closer to the sensor
The Canon EF-S 18-135mm f/3.5-5.6 IS USM is a solid zoom lens. It delivers crisper images than the 18-55mm that ships with many entry-level Rebel cameras, and more than doubles its zoom range.

1 Answer. The short answer to your question is yes, an EF lens can be used on a crop-sensor (EF-S) Canon camera. The longer answer is that EF-S lenses are designed for crop-sensor lenses, the 's' denotes a smaller image circle, but it's otherwise a compatible mount. So, lenses designed for full frame (EF) will also work on your camera.

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    • canon ef ef s ef m difference