Hi Alp, I use the Sony A7R3 and an adapter. I then put a 2X teleconverter and the Canon 400mm F4 DO II for a total of 800mm at about 3 meters from the subject. I also got my Holographic scope to use for birds in flight and other fast moving subject.It is really hard to find the subject in the viewfinder and by the time you find it its too late..
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