The Canon EF12 II and EF25 II Extension Tubes are not compatible with the following lenses: • EF 15mm f/2.8 Fisheye (now discontinued) • EF 8-15mm f/4L Fisheye USM • EF 14mm f/2.8L II USM • MP-E 65mm f/2.8 1-5x Macro • TS-E 17mm f/4L In addition, the EF25 II tube is not compatible with the following lenses: • EF 20mm f/2.8 USM
Canon EOS 5D Mark IV Canon EOS 7D Mark II Canon EOS R6 Mark II Canon EF 70-200mm F2.8L IS II USM Canon Extender EF 1.4x III +6 more > 25 ft = 135mm:
The Canon EF 2X II telephoto extender is a reasonably inexpensive way to double the focal length of some of the Canon lenses. There are a few pro's and con's when considering going this route. The image quality of this extender is extremely good and maintains the image quality of the lens that is attached to.

Shooting with the Canon EF 1.4x III Extender mounted results in reduction of autofocus speed. According to Chuck Westfall (Canon USA): "As with previous EF Extenders, usage of Series III EF Extenders lowers AF drive speed to improve AF performance. When Extender EF 1.4X III is used, AF drive speed is reduced by 50%.

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New Listing Canon EF 70-200mm f/2.8L IS II Telephoto Zoom Lens USM - Excellent Condition (26) 26 product ratings - Canon EF 70-200mm f/2.8L IS II Telephoto Zoom Lens USM - Excellent Condition $247.01

The Canon EF 25mm Extension Tube II is updated to be fully compatible with Canon Digital EF-S lenses, as well as standard photo EF and TS-E lenses. Autofocus (except on TS-E lenses of course) and auto exposure are maintained when using these compatible lenses.

Re: Canon 1.4x EF Extender II vs. III In reply to mrjayd • Feb 4, 2011 They said it has some kind of new coating which reduces ghosting and flare and also a chip with new electronics to improve the focusing when use with the newer generation IS and all those new big telephoto lenses, so it's all good on paper.

Format: Full Frame / FX. Focus: Autofocus. Lens Mount: Canon EF. Release Date: N/A. MSRP Price: $283. Made in: Japan. Production Status: Discontinued. Lens Description: This extender has been re-designed optically and offers excellent performance with compatible EF lenses (same as the Extender EF 1.4x II). Features a new seven-element design

The Canon EF 2x II Extender is an easy and very affordable way to dramatically extend the reach (focal length) of compatible Canon L Series lenses (and a few additional lenses). This review will sound very similar to the Canon 1.4x Extender Review, but the 2x function is basically the same.

I'm using the 100-400L USM IS II, the Extender 1.4X III, and the EF-RF Control Ring Adapter on my R5, which gives an equivalent 140-560mm zoom range. Of course the added lengths of the extender and adapter add to the overall length, but it's definitely a usable combination.

4. Equipment: Canon EOS 1D -X Mark II. Canon EF 300mm f/2.8L IS II USM Lens. Canon EF 2x III Extender. Canon Extension Tube EF25 II. We finally managed to try the extender with another lens and had exactly the same problem. However we then borrowed another Canon 1D body and it worked perfectly! So the issue is clearly with the Canon 1DX ii body
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    • canon extender ef 25 ii