I want to see a
- RF 135mm f/1.4L IS USM
- RF 200mm f/1.8L IS USM
- RF 300mm f/2.0L IS USM
- RF 500mm f/4L IS USM
But I'd be surprised to see further lenses later in 2026.
As for the Series II RF 400mm f/2.8L IS USM & RF 600mm f/4L IS USM. It would likely be out approx 10 years later after Series I's 2021 release. By early 2030s to be used at the 2032 Summer Olympics in Brisbane, AU. A R1 Mark III & R5 Mark IV would be released with those 2 lenses as well hopefully with CFexpress 4.0's 4.0GB/s for 80-120fps @ 2x the MP of today's R1 & R5 Mark II.
What improvements to expect from these Series II fast white long primes at a higher price?
- physically squatter
- lower weight
- more stops of IS
- better USM
- shorter MFD
- optical improvements for higher MP FF image sensors
- >40fps continuous shooting support
We then can expect a Series II RF 800mm f/5.6L IS USM & RF 1200mm f/8L IS USM a year later. Likely with a permanently placed 2.0x TC to keep R&D cost down and profit margins up.
Then again Nikon's 400mm and 600mm lenses with built-in 1.4x Extenders are so desirable that Canon may push up the release of the RF 400mm f/2.8L IS USM & RF 600mm f/4L IS USM replacements to 2030 in time for the FIFA World Cup or Winter Games.