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Message: <blockquote data-quote="Jim M." data-source="post: 3537878" data-attributes="member: 60675">[Edit: note the above post was subsequently edited to quote from and partly respond to this post].I believe you would almost always be better off using the teleconverter  unless you are so close that you do not need to crop.  Because by  cropping you are generally paying a worse image quality “penalty” than  you would be by using the teleconverter (assuming there really is such a  penalty).  That's what I find with the 300 mm F4 prime; I almost always  use it with the teleconverter.     Even 300mm (600 mm equivalent) is not enough reach for birds in most instances.</blockquote>