Looking for some advice please folks if anyone has any experience..I've got an SLT-A58 with the standard lens and a SAL75300. Working with them over the weekend at a motor racing event, the SAL75300 did itself proud - and I got some nice pics (albeit that I made the mistake of not paying close enough attention to the auto-focus on one or two shots and ended up with lovely pictures of the wrong thing, in fabulous focus!). But, the SAL75300 didn't get me quite close enough so I was looking at longer lens or teleconverter.
I've disregarded the teleconverters as I'm worried about loss of light so was looking at a Sigma 150-500. Does anyone have expereince of this combination for sports action shooting...and could you share your thoughts before I go splash out £600+
Thanks
