02-24-2022, 08:20 AM
(This post was last modified: 02-24-2022, 08:37 AM by Brightcolours.)
The TC group used is pretty different from the RF 2x TC, with much bigger elements on the whole, and an SUD element, and without the bulbous back element. So, it appears to be highly optimized for these two long tele lenses. But if you can compare the manufacturer MTFs (can we do that at all, Klaus?) the Nikkor AF-S 800mm f5.6 FL VR look to perform better, so the TC route does seem to give a resolution hit?
The published Canon MTFs of the 400mm and 600mm are pretty great, and the 800mm and 1200mm look much better than those of the 400 and 600mm + RF 2x TC....
No, the front part of the EF 800mm f5.6 L IS USM (6 elements) is pretty similar (but not exactly the same in detail) to those of the EF 400mm f2.8 L IS USM, but the other elements (both in front of the aperture and the elements further in the back) are all specific for their respective lenses.
The published Canon MTFs of the 400mm and 600mm are pretty great, and the 800mm and 1200mm look much better than those of the 400 and 600mm + RF 2x TC....
(02-24-2022, 07:47 AM)Rover Wrote: Was the existing EF 800/5.6 lens also the same kind of construction, that is, actually a 400/2.8 with a non-detachable converter?
No, the front part of the EF 800mm f5.6 L IS USM (6 elements) is pretty similar (but not exactly the same in detail) to those of the EF 400mm f2.8 L IS USM, but the other elements (both in front of the aperture and the elements further in the back) are all specific for their respective lenses.