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I'm not as sure about the A6000 but I thought it could use USB power. If so why not a large capacity USB attachable battery like the 15000mAh battery from Anker

 

Anker® 2nd Gen Astro Pro 15000mAh Triple Port Portable Charger with PowerIQ Fastest Backup 

 

http://www.amazon.com/gp/product/B005NGKR54/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

 

Its also a great travel battery for phone and tablet charging.

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If 48hours of continuous power and 5,000+ shots are enough for your application, I posted a solution here which requires no soldering or any product modification, weighs 1lb, and will also power your camera as well as phone and tablet for 48hours for $120 on amazon:

http://www.sonyalphaforum.com/topic/217-very-long-23x-battery-life-for-nexalpha-7x-easy-and-cost-effective-solution/

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    • i said the lens, Sigma DG DN sports 70-200 FE, the lens is fast enough to track most small birds coming at you or flying away, but the camera seemingly does not want to track   it also does the same with my Sony lenses on LA-EA5 adapter.   I always do birds at f/4 and 1/5000+ and no stabilizer   Thanks for the link on BIF, I will check it out and show results  
    • You must be. I have an A7 IV and an A1, and while the A7 IV isn't nearly as fast as the A1, it is actually more tenacious. I have never had a problem with any kind of action shooting at all. Conversely, I had an A7R III that I loved, but the AF was so far behind the A7 IV I had to give it up.  I also had trouble with Ambassador settings. Without naming any one in particular, I found most of them to be useless.  Have you ever checked out Mirrorless Comparison? This post has rankings for many different cameras. The A7 IV is ranked very high and in some excellent company:

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        Here's a link to the post. You can also poke around the site and find a full review along with his settings for A7 IV BIF, if that helps.   The Best Mirrorless Cameras for Birds in Flight Ranked - Mirrorless Comparison   As to what's causing this, no way to know without knowing every setting, which lenses, etc.     
    • will check these ideas out. thanks to all
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