Specifications: Equipped with a socket for attaching the tripod. Lenses not equipped with a tripod socket can be used by mounting the tripod to the MC-21.
Aperture: Maximum aperture: F4.5 / F5.6 (with built-in teleconverter applied)
Minimum aperture: F22 / F29 (with built-in teleconverter applied)
Number of aperture blades: 9 Circular aperture diaphragm for natural background blurring
Compatibility: Compatible to Tele Converter MC-14: Yes
Compatible to Tele Converter MC-20: Yes
Operates with 5-axis Sync IS: Yes
Compatible with 50fps: Yes
Compatibility: This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L.