I have the excellent 70-200 mm f/2.8 IS II and the TC 1.4x III - which I love, paired to my 5D mark III.
I recently shot some cricket matches, and I think I need more reach than the 280mm available with the 1.4x, and without the bulk (I'm an amateur, and there seem to be restrictions on many games where non-accredited photogs cannot take in big lenses).
I think 400mm would be about right (based on some rough crops of the 280mm), but can't afford the big guns (400mm f/2.8L IS).
The games I would photograph would either take place in bright daylight or under broadcast-standard lighting (1000 lux).
Looking at what's available, the only affordable lens is the EF 400mm f/5.6L. It does seem to be very old, and has no IS.
An alternative is to acquire the TC 2x III - which would give me the same aperture, and add IS with a more modern lens formula / AF combo.
Does anyone have any experience with the 70-200mm f/2.8L IS II with the TC 2x III that they would like to share?