As mentioned, the extender won't physically fit the EF 70-300mm L f/4-5.6 IS USM II, so IMO if you are going to spring for the EF 100-400mm L f/4.5-5.6 IS USM II, I would go for the RF 100-500mm L f/4.5-7.1 IS USM. I agree with Trevor that the EF 70-300L II is a great lens.
A good 1.4x teleconverter, when used with a Canon L 300mm f/2.8 or 300mm f/4, can outperform a good (but not great) 400mm telephoto such as the Sigma APO (not the APO macro version) lens. The 300 + 1.4 TC combination also roughly equals the performance of a 400mm Canon L f/5.6 lens. FF is of course more expensive, but the price differential
EXTENDER EF1.4x II. エクステンダーとは、カメラボディと撮影レンズの間に装着して焦点距離を延長するためのアダプターレンズである。. 装着レンズの高い光学性能を維持しながら“エクステンダーEF1.4×II”は1.4倍に、また“エクステンダーEF2×II”は2倍に
Please see the lens and/or camera body manual for full compatibility information with the Extender RF1.4x. Warranty Info. Canon Sales and Service Center. Canon USA. One Canon Park, Melville, NY 11747,USA. Tel: (1)-800-828-4040. Canon Canada Inc, 8000 Mississauga Road.
Wondering to get either a 1.4 or a 2X extender with the Rf 100-500 lens. Two concerns, one is a lot of wildlife photography is in lower lighting conditions and the 2X drops it to 11/14. Also, was surprised to see that the extender only works 300-500mm (not 1-299mm). Anyone have any experience with t
The T CINE Speed Booster ULTRA 0.71x Adapter from Metabones allows a Canon EF-mount lens to be mounted onto a camera with a FUJIFILM X-mount. The adapter's optics maximize the connected lens's apparent angle of view by a factor of 0.71x while providing a one-stop increase for the camera over the lens's aperture range. More Details.
Note: Kenko TELEPLUS PRO300 DGX teleconverters are compatible with only proprietary lenses (Nikon and Canon) and Tokina lenses (except Tokina AT-X 70-200 F4 FX VCM-S and opera 50mm F1.4 FF Nikon mount). Other manufacturers' lens and camera models, or side-party adapters, are not supported.
Even with a 1.4X TC III its image quality is on par with the best Sigma and Tamron have to offer, and without a TC its image quality is unmatched, except by the EF 70-200 f/2.8L IS II. Add to that a short minimum focus distance and the EF 100-400 L IS II is the best lens in the 100-560mm range. Extending the effective focal length of select Sony E-mount telephoto lenses, the FE 1.4x Teleconverter increases the lens's magnification by 1.4x for a narrower field of view. The dedicated design maintains full communication between the lens and E-mount mirrorless cameras, including auto-exposure metering, autofocus, and Optical SteadyShot GTOR2.
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    • canon extender ef 1.4 x ii compatibility