Viltrox C-AF II Teleconverter

No, compatibility is limited. While it is designed for the Canon EF mount, it is primarily intended for use with prime lenses and telephoto zooms. We recommend checking the specific compatibility list for your lens model before purchasing to ensure autofocus and communication remain functional.

A two-stop reduction means your lens will let in significantly less light, effectively turning an f/2.8 lens into an f/5.6. You will need to compensate by increasing your ISO or using a slower shutter speed, which makes this accessory best suited for well-lit environments or when using a tripod.

Generally, no. Adding a teleconverter often slows down autofocus performance, especially in lower light conditions. While the unit supports autofocus, you may notice some hunting or slower acquisition speeds depending on the camera body and lens combination you are using.

Any teleconverter introduces additional glass elements, which can slightly reduce overall image contrast and sharpness compared to using the lens alone. However, the multi-coated optical design in this unit is engineered to minimize these effects and maintain clarity for your distant subjects.

No, this teleconverter is designed exclusively for full-frame Canon EF lenses. It will not physically mount to EF-S lenses, which are designed for APS-C sensor cameras.