billnikon wrote:
First, you posted in the wrong section.
Second, no teleconverter ever produced improves image sharpness.
Third, combining teleconverter's really makes sharpness suffer, as seen in your images.
Forth, I use a 600mm f4 without any converter on a full frame mirrorless camera that I use for my wildlife photography.
Fifth, I never use teleconverter's because of the reasons I have given.
Sixth, Good luck and keep on shooting until the end.
First, he stated that he did not post in the bird section because he wanted a wider view of his post.
Second, you are correct; however, with new AI software, he can recover some of the lost sharpness
Third, I've never seen a recommendation to combine teleconverters, so I agree with you.
Fourth, Since he already owns a costly 400mm 2.8 lens, purchasing a 600mm f4 at $13,000 seems a bit outrageous since it appears he is not a professional selling his work. Many people use teleconverters but accept that they will not be tack sharp.
Fifth, with a 600mm lens, you will not need a teleconverter for most shots unless you migrate into wildlife, where an 800mm lens is better. However, either lens requires deep pockets.
Sixth, I also say good luck and keep on shooting. However, I'd only use the 1.4 or the 2, not both.
Seventh is not part of the question but from my personal experience. I recently shot a local rodeo from the stands. Being at the far end of the arena, I used a 1.4 tele on my Nikon 200-500 f5.6 lens. This was mounted on a Nikon D850. This, in effect, made my lens one stop higher, which wasn't the effect I wanted. I switched to my 70-200 f2.8 and exposure was much better, but I lost one stop when I tried the 1.4 tele. It may not seem like much, but one stop was noticeable.