In a previous post, we looked at some examples of images using the Canon 1.4x III teleconverter. I’ve noticed that some people looking at the converter were asking about the delays it introduced in focussing.
In day-to-day use the converter adds very little extra weight to the Canon 90 / 70-200 combination. It reduces the maximum aperture from f2.8 to f4.0 and increases the effective focal length from 70-200 to 98-280.
I have not noticed any reduction in focusing speed or focusing options.
Hopefully this short video will help you see that this is a very impressive piece of equipment.
As the final image showed, the video was made by screen recording Capture One 21 on my laptop while it was connected to the camera using a USB cable and extender. The Joby GorillaPod, which the camera and lens were resting on has lived to fight another day.