jb

The 100-400 and 200-600 are very different lenses in use. So it really depends on what subjects you're shooting and how you expect to carry either. The 100-400 carries exactly like a 70-200. Same size and weight. Fits in the same bags. Easily shoulder carried. The 200-600 is very different to carry and use. It's size is more akin to a supertele like the 600 f4 due to the constant length. You need a much longer bag to carry the 200-600. Hiking or simply walking around with it requires a different approach. It's nearly a kilo heavier than the 100-400. I can hand hold the 100-400 all day (and I do). I want a monopod when using the 200-600.

Perhaps a 500mm f/4 will follow? I can dream . . .

My otherwise normal a9M2 has randomly experienced extremely slow file writing the the SD cards. After shooting a high speed burst of 10-20 images, normally the camera clears the buffer onto both cards in ~0.5 seconds per image. Occasionally I am seeing a write times of 4 or 5 seconds per image. Then on the next burst the buffer clears quickly again as expected. No difference in shutter speed, ISO, NR or anything else I can think of. These are 1/1000th second or faster exposures. E-shutter. A 20 shot burst will write the the cards in 10 seconds. Then the next 20 shot burst will take a full minute to clear to the cards. Then the next 20 shot burst will clear in a few seconds. I'm using compressed RAW written to both slot 1 and 2 simultaneously. Identical UHS-II v90 Sabrent SD cards. Cards are always formatted in the camera. The cards were thoroughly tested before and after the slow write times were observed using H2testw and no errors were found. Only a few image were already on the cards (<100) and no new folder was being created on the cards. I've tried to reproduce the issue and I can't make it happen on demand. Seems totally random. Any suggestions of what might be going on?