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<blockquote data-quote="BackdoorArts" data-source="post: 658545" data-attributes="member: 9240">A 600mm lens on a full frame camera at f6.3 has an effective DoF of less than 1 inch for anything inside of 30 feet.&nbsp; On a D500 it's anything inside of 45 feet. Suffice it to say if you're not focus tuning your long zoom lens on your cameras then I don't want to hear about soft focus.With that said, &quot;soft&quot; is all relative. The great thing about the Sigmas is that with the dock you can fine tune at 16 different points (4 distances at 4 focal lengths), so yes, you can get a nice, sharp photo at f6.3, particularly if your subject is dead center, and you don't have to compromise by tuning at a specific focal length. But stop it down to f8 and it's going to be sharper - the test data is out there to show it. The data does not say that you cannot get sharp at 6.3, only that sharpness will improve as you stop down.And we must consider that &quot;sharpness&quot; is the byproduct of many factors, most of which have more to do with the photographer/technique than with the lens.</blockquote>

[QUOTE="BackdoorArts, post: 658545, member: 9240"] A 600mm lens on a full frame camera at f6.3 has an effective DoF of less than 1 inch for anything inside of 30 feet. On a D500 it's anything inside of 45 feet. Suffice it to say if you're not focus tuning your long zoom lens on your cameras then I don't want to hear about soft focus. With that said, "soft" is all relative. The great thing about the Sigmas is that with the dock you can fine tune at 16 different points (4 distances at 4 focal lengths), so yes, you can get a nice, sharp photo at f6.3, particularly if your subject is dead center, and you don't have to compromise by tuning at a specific focal length. But stop it down to f8 and it's going to be sharper - the test data is out there to show it. The data does not say that you cannot get sharp at 6.3, only that sharpness will improve as you stop down. And we must consider that "sharpness" is the byproduct of many factors, most of which have more to do with the photographer/technique than with the lens. [/QUOTE]

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