lilkngster wrote in post #14307481FF vs crop, at the end of the day, it should be an individual decision, based on one's need
. On a crop, sure you are missing out on the corners of the lens, but did you look at the MTF charts of this lens for a crop? Yes, comparing two different manufacturer's MTF chart, but the corners of this lens on a crop and the potential bokeh look pretty sick especially compared to Canon's 17-55, doing a little mental extrapolation.
I agree with you completely..
mattmorgan44 wrote in post #14307337It may be an excellent choice for you
, but you should think carefully if you are not going to full frame any time soon..
You understand what I posted about, but not everyone does. Not everyone knows that when you buy a lens designed for a full frame camera you will pay for the R&D that went into designing the lens for full frame corners. I responded to the comment a page back because I got the feeling this person didn't know this information.
It may be that the Tamron lens is still the best choice for them. The best value or the best outright performing at that price point. However careful consideration should be given to lenses designed for crop bodies for the reasons mentioned. I havent compared the MTF charts, but no one really knows yet how this lens performs and crop shooters may get carried away in the L Mark II vs Tamron battle and neglect EF-S lenses or their equivalents.. Just saying maybe don't sell your lenses before knowing all the facts.
Also, many people don't realize the field of view they will lose on a crop camera going from 17mm to 24mm. Many people believe the fov gained from 55mm to 70mm is greater, when it is not even close to the loss at the wider end. The loss is exponential at the wider end and I reccomend anyone with a crop body switching from a 17-5x general purpose lens to this lens, check your past photos or tape your lens at 24mm for a day out and see how often you would like to use 17-23mm. Again, the 24-70 may suit you better, but I'm sure many people will make these switches without knowing these things.