My 18-250 Sigma is in for a quote on repairs and I have been thinking about a replacement if it is not economical to repair. The Canon 70-200 F4 L IS and the Sigma 70-200 F2.8 OS are similar prices and I am wondering which would be the better choice. The main use would be football and motorsport plus as a general walkabout lens. The canon F2.8 IS is way out of my budget and I have not been able to find a sensible comparison between the F4 Canon and the F2.8 Sigma.
Keith.