I just bought Focal Pro to test and tune my sigma lenses. I also got tired of Focal and upgrades - I only use it with new cameras and new lenses, and it seems every time I needed it (ever couple years) I needed to get an upgrade. at the focal length and distance, as well as close and far and in and out to see how it varies, but give a lot of weight to the place you use it. I'm a big proponent of testing it where you use it, i.e. Some lenses (my 85/1.4 is awful) are significantly different for close and far. Some zooms are significantly different zoomed in and out. It's also worth saying that there is NO correct AF Fine tune for some lenses. I can SEE the DOF range move as I adjust, so I can tell (for example) if it's moving consistently, or not (some lenses just plain do not consistently focus, and you have to do a lot more tests to see where the average DOF area is). I can SEE the DOF range, not just that I have a soft image. Not because it is inherently better, but because it is more natural from a human standpoint. You can run a longer and more thorough test, and it may be worth trying.Īll that said, over time I have migrated to more slant-view approach as well (e.g. The issue is that lighting variations get mistaken for focus variations (shouldn't, but did at least at the time).Īnother issue is that over time they have gotten more aggressive at prediction.
My best luck was with a couple droplights lighting the target indoors. if there are ever any cloud variations, will not work. Lighting is a big deal - you need good, contrasty lighting and a very stable target (I found this to be an issue when trying to test really long lenses outside). I used it some years ago and got quite good results on most lenses, and learned a lot about them.
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