I am going through various options in chosing a telephoto (probably zoom) for sports (mainly) photography. I am considering the following to use on a Canon 30D:
Canon EF 70-300/4.5-5.6 IS (cost ~ 650 euro)
Sigma 50-500 (cost ~ 900 euro)
Sigma 80-400 OS (cost ~ 1000 euro)
Canon EF 300/4.0 IS (cost ~ 1300 euro)
Canon EF 100-400/4.5-5.6L U IS (cost ~ 1700 euro)
I have put the lenses in order of increasing prices. My prime scope for the lens is Athletics and secondary is wildlife. I don't mind using a monopod but a tripod is bulk I would like to avoid.
Obviously, there is a range between 300 and 500 mm in the max telephoto value of zoom lenses that makes me wonder what is enough and what is a waste. I have a plain 70-300 lens and did some shots which show that there is something more I need in range.
The Canon zoom (70-300) is compact, cheap and IS enabled. I like it but it's short-ranged.
The Sigma 50-500 is long range telephoto and have read rave reviews, but it's bulky, heavy, requires at least a monopod and has no IS.
The Sigma 80-400 has IS (OS) and in reviews shows comparable image quality to the Canon L series. That tempts me, however in the same reviews it is noted that auto focus is slow and that continous burst shots show delays. Any real life experiences?
The 300/L is a good compromise in terms of cost, performance and quality but will make me miss the zoom capability and in terms of range looks short.
Finally, the 100-400 appears to be the winner, if only somebody would buy that to me. It really is slightly beyond my reach.
So, my real question is:
Does the lack of IS on the 50-500 and the weight make it unusable for sports? Is the Sigma 80-400 good for sports or not fast enough? Is 300mm (i.e. 480 with the 1.6x) enough for athletics or should I need the extra 100 or 200mm?
Any experiences and feedback gracefully accepted.
Thanks in advance