I’ve read numerous reviews and opinions about extenders—some people love them, while others hate them. This note focuses on the Canon EF 1.4x Mark III extender, and it’s worth specifying that most of the negative opinions about extenders often refer to other brands.
The reality is that extenders require more light for autofocus to function properly. When it comes to sharpness, if you pair an extender with a high-quality lens and use a full-frame camera with good dynamic range, you likely won’t notice a significant loss in image quality.
A while back, I bought the Canon EF 1.4x Mark III to use with my Canon R7. Unfortunately, my experience with that combination was disappointing. The performance issues were so frustrating that I stashed the extender in my backpack and didn’t touch it for nearly two years.
Recently, after reading some new reviews, I decided to give the extender another chance—this time pairing it with my Canon R6 and EF 100-400mm Mark II lens. WOW! The results were incredible. Not only does this combination work exceptionally well, but it might even deliver sharper results than using the lens alone!
Here is a picture taken this weekend in a very cloudy day using this setup.
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