Key Features. The B4 2/3" to Canon EF Adapter from MTF Services Ltd enables the use of ENG style B4 2/3" lenses on cameras with the Canon EF mount. The adapter features multi layer coated optics, solid aluminum construction and a chrome plated EF mount. A lens support bridge for use with industry standard 15mm rod support systems is also included.

Caveats (Supported Lenses and Stacking) Canon’s extenders, both the 1.4x III and the 2x III, have front elements that project into the rear of the lens their mounted to. As a result, they’re not universally compatible with all of Canon’s lenses, and I can’t even begin to comment on compatibility with 3rd party lenses.

Rf lens and Rf extender compatibility in EF & RF Lenses 10-05-2023; lens extenders in EF & RF Lenses 10-02-2023; EFS to EF Lens Adapter Availability in Camera Accessories 09-06-2023; Extender for EF 100-400 L lens on a R5 body in EF & RF Lenses 08-24-2023; What lenses work with Canon Extender RF 1.4X (4113C002) in EF & RF Lenses 08-06-2023

^{Box Dimensions (LxWxH) 9.6 x 4.8 x 4.6". Buy Tokina SZX 400mm f/8 Reflex MF Lens with 2x Extender Kit for Canon EF featuring EF-Mount Lens / Full-Frame Format, Fixed Aperture: f/8, Catadioptric Telephoto Lens, Manual Focus, Multicoating and Antioxidant Coating, Close Focus: 45.3", Front Filter Size: 67mm, 2x Extender. Review Tokina null.} VILTROX Auto Focus 2X Teleconverter Extender Converter for Canon EF Mount Super Telephoto Lens 135mm f/2L,200mm,300mm,400mm,600mm,70-200mm,100-400mm and DSLR Camera 5DII 80D 760D 7D,Black. 79. $11500. FREE delivery Mon, Jan 8. Or fastest delivery Fri, Jan 5.

I don't have a huge budget so I can't afford 100-500mm lense or the new 200-800mm lense. So I'm hesitating between the 600MM F11 (400$ used) and/or 800MM F11 (625$ used) VS. Using a Canon RF 2x Extender on my RF 100-400mm F5.6-8 IS (550$ used). Your advices would be really appreciated and thanks in advance for your generosity.

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canon extender ef 2x compatible lenses