The white dot for the mounting index point suggests that it isn't a Canon lens.
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Consider renting before buying; get one or two for a weekend and see what fits you. There are lots of options to match whatever you want to invest. I'd also recommend Lightroom, it's worth it.
I was thinking about renting but it's rather pricy For a weekend for a body and 1-2 lens it would cost me over 200$... yikes.
I dont want odin. I have canon st-e3-rt and 600ex-rts. I want a small, cheap, reliable rt-transceiver to include 580ex/430ex.
Nothing else. Not interested at all in yn600ex-rt or shanny 600 clone strobes.
In any case the lights will tell you if they're getting hot.
So from this I might infer that the worst thing that can happen is that it stops working for a while until it has cooled down?
I could see a very desirable but expensive application for a TC with a DO element in a lens that has a built-in TC that can be engaged / disengaged.