OutsideTheMatrix
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I have an idea but you may or may not like it.Good for you. But I have lost enthusiasm in finding a BIF solution that matches my weight and budget limits (the RX10M4 is cool but 600mm isn't good for a kingfisher). Maybe that 10000 yuan is to be spent elsewhere (not on a camera).I dont know if fast AF is all that important with my EM10 Mk2 and 75-300 lens I lock focus on a favorite perch and take pictures of birds flying on and off it, the focus distance is the same so no reason for continuous autofocus. The camera can shoot 8 fps until the card is full so I just keep shooting when a bird is perched and get all the BIF shots I need when it takes off.No, the 18-400 is heavily criticized on the "Camera, Lens and System Buying Advice" forum as it has very slow AF speeds, not suitable for BIF. People say the RX10M4 can achieve fast AF because the body and lens are designed for each other.If you're going the ILC route, should also consider something with a Tamron 18-300mm or Tamron 18-400mm lens.
Never used them but I've always preferred all in one vs having to change lenses.
Have you considered a spotting scope? They are lighter and cost less than lenses and you can hook up your mirrorless camera to one and get thousands of mm in focal length.


