Skirtball - you are correct. DOF on a 70D, 70mm, 15', and f4 is 2.11 feet (near to far). Even though with a crop sensor camera, you set the actual FL (70mm) on the calculator. By setting the camera body, the crop factor is calculated corectly.I guess...
Google DOF calculator - there are lots of free ones. At 70mm on a full frame body (Canon 5d in this example) at a distance of 10 feet the DOF is: at f4 = 1.47 feetat f2.8 = 1.03 feet The f2.8 lens has about 30% less DOF wide open at 10 feet. Thing...
Repairable as others have said. This is pretty common with the 24-105 f4 L. If you get it repaired, it will be good for a while, but the same think will happen again. Is it worth it, that depends. I love the lens. I use it more than my 24-70 f2.8 L,...
Well, the 50mm 1.2 L is a bit notorious for focusing issues. However, the 5D mk III works very well with it. On a prime lens you should not have to set different micro adjustments for different camera to subject distance. Needing to use the micro adj...
While all Canon EF and EF-S lenses will work on a 60D (an APS-C Canon DSLR), older Sigma lenses often will not auto-focus. When I went for film to digital (Canon EOS AE1 to a Canon 30D) all the Sigma lenses failed to auto-focus. At one point Sigma co...
