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Message: <blockquote data-quote="Jim M." data-source="post: 3669218" data-attributes="member: 60675">Hi Jack,The micro 4/3rds systems (Panasonic & Olympus) are pretty much designed for someone like you in mind.  My Oly EM-1, mk. ii with Panny-Leica 100-400 (200-800mm equivalent) weighs 3 pounds and the length is 9 inches.  While that combo exceeds your budget, there are significantly cheaper but still good options for the body, and you could try to find a used lens (or start with the 100-300).The alternatives either weigh significantly more or have smaller sensors with reduced low light capabilities.  (The Sony RX10 IV you mention is also attractive, but the wider aperture is offset by the smaller sensor for low light capabilities, and I'd want the ability to go beyond 600mm equivalent reach at some point.  But since it's not an ILC, you're stuck with that one lens.)</blockquote>