fragilesi said:I certainly won't argue with you guys on that point. But given my budget, I'm looking at the Tamron 70-200 not the Canon one OR the 135L. Would your answers be the same based on that . . . ?
I've never use the Tamron, but I think my answer would be mostly the same. I'd suggest that you take a look at the Tamron 70-200 (and Canon 70-200 with and without 1.4x) and the Tamron 150-600 before buying anything. I'm positing that a 70-200 will satisfy most of your indoor needs and that the 150-600 might suit you better if you need more reach for birding than you have with the 70-300L that you currently have. What you'll be trading is weight/compactness for greater focal length range.