I have used Focal for some time. It works extremely well (for me) for lenses up to 300mm. I also recently had my 1Dx body calibrated to my 300 2.8 and 600 f4 (both isII) lenses by Canon and then immediately checked them on Focal and got results around zero AFMA which is reassuring.
However, my 600 f4 isii/1Dx combination produces dodgy looking calibration curves and sometimes fails to produce any curve with extenders. The camera is mounted on a low level Gitzo 3 series tripod with a Wimberley 2 head and the target is the larger pre-printed target mounted on a foam board at a distance of about 100 feet (33 yards, 30 metres). I have attached a couple of images of the curves/data points to show what I mean below.
Has anybody had similar issues with long lenses with Focal and found a solution? Are there any tips you guys can pass on? Any help appreciated.
One is for 600+1.4 and another for 600 +2x
Many Thanks
Michael
However, my 600 f4 isii/1Dx combination produces dodgy looking calibration curves and sometimes fails to produce any curve with extenders. The camera is mounted on a low level Gitzo 3 series tripod with a Wimberley 2 head and the target is the larger pre-printed target mounted on a foam board at a distance of about 100 feet (33 yards, 30 metres). I have attached a couple of images of the curves/data points to show what I mean below.
Has anybody had similar issues with long lenses with Focal and found a solution? Are there any tips you guys can pass on? Any help appreciated.
One is for 600+1.4 and another for 600 +2x
Many Thanks
Michael