Canon RF 400 f/4 DO with built-in 1.4x TC and 600mm

[AlanF]

Canonwatch has come across an exciting new patent https://www.canonwatch.com/canon-pa...extender-1-4x-and-600mm-f-4-is-extender-1-4x/
The prospect of a 400mm f/4 with the TC is exciting for me anyway! The focal length is given as 392.58mm and the f = 4.12. It can be squeezed into just over a 95mm front element, which is close to what I measured for the EF 400mm f/4 DO II. The 600mm is not a DO lens.

 

[privatebydesign]

Now Nikon have the 400 f2.8 with 1.4TC in I believe that will become the norm for many of the superteles.

 

[unfocused]

I would be surprised if Canon were to release another 600mm big white with the exact same aperture. But, at $13,000 for the current EF and RF lenses, it is all academic to me anyway.

 

[snapshot]

What's not to like, buy a 600 f/4 get a 400/f2.8 for almost free, and can switch at the flick of a switch. Will be a helpful kit with the Z9.

 

[Deleted member 381342]

If the Canon's can be engaged while the camera is active like the Z 400 f/2.8 TC then it will be very exciting. The older EF 200-400 f/4.0 TC and Nikon 180-400 have all kinds of warnings about not to engage the TC while you are focusing or VR/IS is active. The new lens lets you flick back and forward while shooting at peak action and that's what makes it even more exciting. Built in TC's seem to be how we make super tele lenses unique for mirrorless, or perhaps just to add some bulk to an otherwise long empty stem.