No.
The best Canon EF to Sony A mount adapter available in the market is the Metabones Canon EF to Sony E-Mount T Smart Adapter.
The best EF-M lenses compatible with the EF mount are the Canon EF-M 22mm f/2 STM, Canon EF-M 32mm f/1.4 STM, and Canon EF-M 11-22mm f/4-5.6 IS STM.
No, EF-S lenses are designed specifically for Canon cameras with APS-C sensors and have a smaller mount than EF lenses, which are compatible with full-frame Canon cameras.
No, EF-M lenses are not compatible with EF mounts. EF-M lenses are specifically designed for Canon's mirrorless cameras, while EF lenses are designed for Canon's DSLR cameras with EF mounts.
The Sigma USB Dock is compatible with Canon cameras that have a Canon EF lens mount.
EF lenses are designed for Canon DSLR cameras and have a larger mount diameter, while EF-M lenses are designed for Canon mirrorless cameras and have a smaller mount diameter. This means that EF lenses are not compatible with EF-M cameras, and vice versa. Additionally, EF-M lenses are typically more compact and lightweight compared to EF lenses.
All lenses that have a "ef" or "ef-s" mount can work on a canon 50d. Be mindful, if you decide to go with a fill frame camera later on, the "ef-s" lenses will create heavy vignetting on those cameras?
Yes, a Vivitar lens can fit a Canon T2i camera if it has the appropriate mount type. The Canon T2i uses the Canon EF or EF-S lens mount, so you'll need a Vivitar lens that is compatible with this mount. Check the specific model of the Vivitar lens to ensure compatibility before purchasing.
The Canon EOS Rebel, Rebel XT, and XTi are EF-S mount. They will accept EF-S and EF mount lenses.
The Canon 60D uses an EF mount type.
Any lens with EF mount to digital cameras and to cameras with APS-C sensor (smaller than full size) EF and EF-S mount lenses. To EOS film cameras FD mount lenses. To all EOS cameras, almost any lens with adapter: EF, EF-S, FD to other mount. For example EF to M42 adapter and you can use M42 lenses.
Canon EF lenses are designed for full-frame cameras, EF-S lenses are designed for APS-C sensor cameras, and EF-M lenses are designed for Canon's mirrorless cameras. The main difference lies in their mount and image circle size. EF lenses are compatible with all Canon cameras, while EF-S lenses are only compatible with APS-C sensor cameras. EF-M lenses are specifically made for Canon mirrorless cameras. Using the wrong type of lens on a camera can result in vignetting or image quality issues.