Originally posted by neostyles Thoughts?
What in particular are your shooting requirements with a 200-300mm lens? What things or events are you using it for?
That matters as to recommendations.
Two of the key attributes of a longer telephoto zoom are sharpness and AF performance. In my experience shooting with several long tele-zooms on both Pentax and Canon cropped and FF bodies, third party lenses can have very good optics (approaching the quality of OEMs) but their AF tracking capabilities are their weaknesses, for understandable reasons.
If you are not shooting much action (sports, birds, wildlife) then this may not be a primary requirement.
Please enlighten me.
M