 The Canon 100mm F2.8L IS Macro mounted on my 6D. While built of plastic, it feels modern and very well made. It is relatively large compared some shorter and squatter primes like my 50mm F1.4 &amp;nbsp;or 85mm F1.8 but it still balances pretty well and feels great to shoot. The stabilizer seems to work very well. Even if you are shooting with strobes or high shutter speeds, it can be nice to have a stabilizer viewfinder to help with composition. Focus speed is very fast when you have the focus range limiter switch set to the correct setting for your subject. If you aren't shooting at macro distances, its best to keep it focussing from .5m-infinity so it doesn't spend any time hunting for focus at close range.&amp;nbsp; 