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Message: <blockquote data-quote="a.dancy" data-source="post: 1209589" data-attributes="member: 25708">For some reason, the Sigma primes get a bit of a slamming for shots taken wide open and in low light. I can't quite work this out. I use the Sigma f4.5 500mm regularly in low light and wide open. If you have the cash to get a secondhand Sigma f5.4 500 then perhaps you should consider going for it. Brand new it is still a very good value lens. The facility of IS on the Canon equivelant and I suppose its slightly faster speed will bring some benefits but I do not accept that the difference in quality (for most shooting situations) is as great as many might imagine...and yes I have used the Canon. I my view the Sigma primes are much under-rated.Although I have not used the Sigma 800 prime it is my understanding that it is a bit soft. If you cannot afford the canon 500 then you will not be able to afford the 300-800 and besides you will need a rock steady tripod and head to use it. I would love to be able to try that lens out though.The attached spotted flycatcher shot is taken in low light with lens wide open very minor alteration of levels an minimal sharpening. The stonechat shot is taken with a 2X converter.Good luck with your choice.</blockquote>