Lenses aren’t usually sharp wide open. It could be that particular lens is poor wide open.
It might be worth trying DXO software on trial. That will analyse from the photo, the lens type, focal distance and aperture, then unblur it.
Thanks for the info. I’ve tried some static shots and that seems OK. However, when I get to the longest range of the lens it seems that atmospheric conditions can have a bearing. As this is M4/3 and supposedly double the range/crop size of a full frame camera it seems that I’m not compensating for this and so is down to my technique. I’m currently reading through some articles about long lenses and it looks like I will have to be extra mindful of even the minutest body movement - so I think a monopod is in my near future.
Cheers
Tim
The crop or sensor size has nothing to with it. 600mm is 600mm.
Atmospheric conditions could be something, but 600mmm is not that long really.
Does it have image stabilisation?
1/2000 is pretty fast, so if it is that with you, you need to steady your hold or get a monopod at least.
It could be the focusing system microscopically trying to track the subject (actually moving whilst you’re shooting).
Shooting 600mm is not that easy and perhaps you just need to practice more. TBH, photography is not that easy, that’s why you don’t see many good shots often.
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Wonderful lenses and great cameras , sadly I found the electronic viewfinder difficult with my cataracts with both Fuji and Canon . Gone back to SLR , loads of nearly new lenses as people switch
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After several months of not using my 5d4 I dragged it out when visiting Wakehurst last week. This was about my 5th shot, I think the last time I used it was in May. Not perfect but ok for someone so out of practice.
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Monopod and IS might be the way to go. Opinions vary.
Liking the R5ii so far, leaps ahead of the R6 in technical ability, which is a blessing and curse. It feels like I was really pushing the R6 at times whereas this kind of takes it in its stride and I can see some things which were a bit tricky with the R6, relying on years of practice and technique, being less awkward. The eye AF is defo a notch up.
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Oh dear! I’m just going to have to do my best to resist the temptation to upgrade!
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I shall get the chance to give it a thorough going over in the next few days 
Got my invite to RAF Northolt tomorrow night and then the weather forecast has cleared up for what looks to be a cracking line up at Duxford on Saturday 
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Hope you have clear skies and a dry night, looking forward to your results.
No pressure then…
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None at all 