Canon Extender EF 1.4X III - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: I am thinking about getting one of these to use with my 200mm f/2.8L II USM lens. This would give me 280mm at about f/4. Its compatible with the 200mm lens. I will be using it with my 6D and 5DMkIV. Would this extender introduce too much distortion in astrophoto images? 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. 1. The only configuration that will work is camera>adapter>ef extender>Ef lens. -- hide signature --. Steve. stevenblackwood1950@gmail.com. Milwaukee WI. Steven Blackwood's gear list: Canon EOS R Canon EOS R6 Sigma 100-400mm F5-6.3 Canon EF 70-200 F4 II Canon RF 35mm F1.8 IS STM Macro +3 more. Reply Reply with quote Reply to thread Complain. 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). I tested three lenses: the new Canon EF 100-400mm f/4.5-5.6L IS II USM, the original Canon EF 100-400 f/4.5-5.6L IS USM, and, because people will ask, the Canon EF 70-200mm f/2.8L IS II USM attached to a Canon Extender EF 2X Mark III. They were tested at full telephoto, which should be 400mm. Canon Extender EF 1.4x II. Canon Extender EF 2x II . Sample Images (many more in the review) top. Sample Images Intro Specs Performance. Compared Usage Recommendations More. Flower, December 2014. Canon 5D Mark III, Canon EF 180mm f/3.5 L, f/3.5 (wide open) at 1/500 at ISO 100, no lens profile used, Athentech Perfectly Clear v2.) bigger. A 70-200mm lens with a 2x extender becomes a 140-400mm lens for example. There’s no such thing as a free lunch though! Using an extender will reduce the maximum aperture of your lens. A 1.4x extender will cause your maximum aperture to be reduced by one stop and a 2x extender will cause a two-stop decrease. 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 BKnelb.

canon extender ef 2x iii sample images