« on: February 06, 2013, 11:32:18 AM »
I am reading up a lot on this, preparing for purchasing a 7D classic, and everyone seems to agree that the 18mp APS-C sensor is capable of excellent results, providing it is paired with a "good enough lens".
So, my question is: Which lenses ARE good enough for the 18mp APS-C sensor?
Which lenses are good enough (sharp and resolving power) for the 18mp APS-C sensor, below 1000$?
Are you concerned that an 18mp crop sensor will show up flaws in your lenses because your camera has a sensor that's inferior in some way (or will this be your first DSLR?)? Or are you trying to find lenses that will maximize the potential the sensor has to conjure up sharp photos? (One could also flip your question around: are lenses whose performance would be wasted on a 7D because they need, say, a FF sensor to show them off, so you would be wasting your money on them?)
If your concern is with maximizing sharpness, you might as well just look at various resolution comparisons and charts of the sort you'll find at The Digital Picture, photozone, lenstip, etc. Almost all Canon's primes are very sharp in the center, including the cheapest (their flaws tend to be confined to edges and corners and thus are much less in evidence, if at all, on crop-sensor cameras), and so are some of their cheaper zooms; plenty of superb photos have been taken with the 50mm 1.8....
But assuming you already have a lens or three, why don't you use them on your 7D and see how they perform? If you're not satisfied, note their deficiencies and then come back and ask if there are better alternatives. But you may be pleasantly surprised. Plus, as others have noted, depending on how you view your photos and how critical your eye is, you may often conclude that the differences among lenses is exaggerated.