An f/2.8 lens can take a 2x TC and still be only an f/5.6 aperture, so it will still AF on any Canon body. These are certainly more expensive than the $1800 100-400 L, but older used ones can often be found on eBay and Craigs List for around $3000 to $3500 (original non-IS versions), and starting around $3500 to as much as $6000 (IS versions).
Can confirm it works perfectly and autofocuses at f/8 on the EF IS non-L 70-300mm. I don't think its a great teleconverter, if you have the compatible L lenses, you can use the Canon ones - which are higher quality glass. PhotosByHall's gear list: Canon EOS 7D Mark II Canon EOS 5D Mark IV Canon EOS M50 Canon EF 50mm F1.8 II Canon EF 17-40mm f/4

In reply to birdbrain • Mar 8, 2021. For zooms like the 100-500, no. I have owned every version of the EF 100-400 & 70-200 f2.8 and I was near happy with the results of the 2x extenders. The 2x extender can add value on the EF Big Whites, you will loose some IQ but the results are acceptable (and at f8 in most cases).

Canon Extender EF 2.0x III. 15,900 ฿ – 18,200 ฿. ประกัน EC-Mall (เช็คสินค้าก่อนสั่งซื้อ) ( 15,900 ฿) ประกันศูนย์ (เช็คสินค้าก่อนสั่งซื้อ) ( 18,200 ฿) SKU: 2759 Category: Canon เลนส์-แคนนอน
by Andrew Alexander The Canon 2x lens extender doubles the focal length of a lens, making (for example) a 200mm lens function as a 400mm lens. The 2x series was introduced in 1987, updated

Sample Images. The thumbnails below link to full-sized samples taken with the Canon EF 70-200mm F2.8L IS III USM lens mounted on a Canon EOS 5DS R camera. Download. 1/125s · f/8 · ISO 320. 70mm.

The 300 f/2.8 IS performs better with the Canon EF 1.4x II Extender and the Canon EF 2x II Extender than most if not all other Canon lenses. Adding the 1.4x creates a 420mm f/4.0 IS lens - a very nice focal length and max aperture - and yes, IS still functions with the extenders installed.
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    • canon extender ef 2x iii sample images