Devilish wrote in post #11094461
Thanks for the comments.
Just to confirm, "105 equates to EF-S 168mm" will this extra zoom be noticable over the 85 end on the 15-85? and does that mean 85x 1.6 is 136? or is it actually 85mm compared to 168mm on the 24-105?
I will still have my 18-55 lens so if I need the wide angle end I can just swap lenses if needed. Thoughts?
PS I am not concernced about full frames. I have a 60D with no intention in the next 3 yrs (at least) to upgrade
If you're just going to use the lens on the 60D then ignore the full frame conversions and the crop factor. 105mm will bring things a bit closer than 85mm. (105/85 = 1.24, so things will be 24% larger in the image (in one dimension, not area))
If you're keeping the 18-55mm then a "traditional" telephoto partner to it is the 55-250IS. This lens is small, light and great value and similar quality to the 18-55IS.
The 15-85mm is a step up in quality and basically would replace the 18-55. It does all the same things but better, wider and longer... at the cost of being more expensive, bigger and heavier.
I have no experience of the 24-105 except for reading everywhere that it makes most sense from full frame cameras in terms of focal length.
So I think you need to decide whether it's focal length or quality you're after...