The never-seen-before primes predicted for 2026 will be big whites with TCs.
The never-seen-before zoom predicted for 2026 will be.......(?)
What's the fuzz with built in TCs?
Let's go into details:
The EF200-400 with the 1.4 engaged offered 280-560 5.6 @ infinity (you never shoot at infinity!) I used it for years: Stellar IQ, bad for birds, bad for smaller objects like butterflies, dragonflies: by far too heavy and a lack of shooting distance and magnification at the short end, the effective focal length at minimum distance is just 287mm (metadata lie and tell you 560mm). Magnification 0.21x
The RF100-300 with the added 2x converter offers 200-600 5.6 @ infinity (again: you never shoot at infinity!): Still superb IQ, great for birds, great for butterflies and dragonflies: handhold ablility, focusses down to the ground just infront of your shoes, the effective focal length at minimum distance is 338mm (metadata lie and tell you 600mm). Magnification 0.31x. What a difference in weight @ versatility! (even not thinking about the options to shoot without TC or the 1.4x version)
Friends: The future is zoom! I am so happy with the practical use, I sold the EF 600 4.0 version 2 which gave stellar performance as well but wasn't used too much due to a lack of handhold ability and versatility. Let us not forget: The 100-300 + engaged hood + TC fits in a pack where the v600 without hood and TC does not fit. A lens not being ready to shoot never gives you the intended success (as long as you are not sitting in a photo blind ...)
BTW: The real replacement of the EF180mm Macro is the 70-200 Z with 2x TC: Max magnification 0.66x, effective focal length 173mm (whereas the 180 offers 140mm @ 0.66x mag. . It is f/3.5 vs f/5.6 in these shooting conditions - but who shoots f/3.5 in the wild with a digital sensor at magnification 0.66x??? Don't let us talk about versatility, the zoom is one leg of the 2.8 trinity. And this lens is stellar for closeup work in the wild - all just as a windfall profit of up to date technology!
Friends: Do not stick to legacy experience: My 180 is gone, my 200-400 is gone, my 600 is gone. I am happy!
I am ready for a ultra light 500mm prime (no built in TC) or a 200-600 zoom giving the option to extend to 1000mm/1200mm focal length if "needed" and hot air does not destroy any expected IQ.
All shots with 100-300+2x, none would exist with the previous equipment