>>4307287panasonic 100-400mm (200-800mm FF equiv)
used to have olympus 75-300mm (150-600mm FF equiv)
>>4307313you want 600mm, anything more is unnecessary and barely noticeable, anything less and you'd wish you had more
there is a point of diminishing returns
the difference between 100 and 300mm is huge, but the difference between 600mm and 800mm is like a tiny pinch inwards
i only upgraded from 600mm because the lens had no stabilization and the competing lenses at that focal length weren't as sharp, it was otherwise adequate