The Canon EF 400mm f/2.8L IS III vs. EF 300mm f/2.8L IS II Lens comparison shows the 300 being considerably smaller, but the weight difference is not as significant. The 300 costs about 1/2 as much and that is rather significant. If you need 300mm, the 400 cannot do that. The differences extend with extender use. Canon EOS R6 + EF 100-400mm f/4.5-5.6L IS II USM lens + EF 2x III Extender. . I wanted to spend more time with the EF 2x III Extender on the EOS R6. I prefer the EF 1.4x III Extender for its wider aperture range and much smaller size and image quality from the EF 1.4x III is very close to what you get from the lens unaided. Question: Am I severely handicapping myself, resolution wise, by using a Canon 70-200 f2.8 II with a Canon 2x converter on my Canon 7d mark2? - Stephen S. [youtube Posted January 2. The Canon 70-300 IS is a really good lens, far better than previous 300mm consumer grade zooms sold by Canon and others. The original 70-200 F2.8L IS plus Canon 1.4x converters produce very good image quality. I don't know if it is better or equal to the 70-300 IS but it will be 1 stop faster. The Canon RF 100-300mm F2.8 L IS USM Lens is compatible with the Canon RF 1.4x Extender and the Canon RF 2x Extender . With the 1.4x behind it, this lens becomes a 140-420mm f/4 IS lens. With the 2x mounted, it becomes a 200-600mm f/5.6 IS lens. Having 100-300mm f/2.8, 140-420mm f/4, and 200-600mm f/5.6 IS lenses available with a quick extender A zoom as good as a prime lens. One of the finest telephoto zoom lenses in the EF line, optically comparable to a prime lens. Four UD-glass elements to correct chromatic aberrations and multiple zoom groups allow internal focusing, resulting in high image quality throughout the zoom range. Compatible with Extender EF 1.4x and 2x. This item Canon EF 2X III Extender Lens for Canon DSLR Camera Sigma 150-600 Mm F/5-6.3 Dg Os HSM Contemporary Lens for Canon Cameras (745101, Black) Canon EF 70-200mm f/2.8 is III USM with Lens Case and Lens Hood- Black Canon EF 70-200mm F2.8L IS II USM Canon EF 70-200mm F4L USM Canon EOS 6D Canon Extender EF 1.4x II Canon Extender EF 2x III If you believe there are incorrect tags, please send us this post using our feedback form . I have the EF 70-200 f4L IS (v1) and using the 1.4x II it works ok but with 2X III it is only good with stationary object. Anything that requires faster AF is useless. As a result. I sold the TCs and bought a RF 100-400. Buying the RF 100-400 and add a RF TC wight be worthwhile if you can't swing for the RF 100-500. Canon EF 70-200mm F/2.8 L IS II USM Lens & Canon ef extender 2x iii Before and after test. No post production to footage. Camera Used is Canon 70D. This is j 4hSud3.