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<blockquote data-quote="Whiskeyman" data-source="post: 251159" data-attributes="member: 13556">Glenn, My first thought, after seeing the differences in shutter speed, was to look again at the lens filters installed on them.&nbsp; Since they are the same filter type and manufacture, that shouldn't make a difference.What I'm seeing from this one example is that at the same aperture, the Sigma is a faster lens, by about 10%.&nbsp; That could be caused by several factors, the first three that come to mind are the number of elements, aperture accuracy, and lens elements coatings.&nbsp; I haven't seen or heard of aperture accuracy issues in a long time, but I do remember hearing about it from a recording crew where I used to work. As far as coatings go, especially with today's ultra-multiple element lenses, any improvement in lens coatings can greatly add to the speed of a lens.&nbsp; Also, the fewer elements in a lens, the more light that should be transmitted through it.I'm interested in hearing more about this.&nbsp; The Nikkor 85 f1.8 isn't a Nano-coated lens; maybe it should be.&nbsp; If third party lenses really improve, it just may force Nikon to step it up a notch on their own.&nbsp; I, for one, am not opposed to that.WM</blockquote>

[QUOTE="Whiskeyman, post: 251159, member: 13556"] Glenn, My first thought, after seeing the differences in shutter speed, was to look again at the lens filters installed on them. Since they are the same filter type and manufacture, that shouldn't make a difference. What I'm seeing from this one example is that at the same aperture, the Sigma is a faster lens, by about 10%. That could be caused by several factors, the first three that come to mind are the number of elements, aperture accuracy, and lens elements coatings. I haven't seen or heard of aperture accuracy issues in a long time, but I do remember hearing about it from a recording crew where I used to work. As far as coatings go, especially with today's ultra-multiple element lenses, any improvement in lens coatings can greatly add to the speed of a lens. Also, the fewer elements in a lens, the more light that should be transmitted through it. I'm interested in hearing more about this. The Nikkor 85 f1.8 isn't a Nano-coated lens; maybe it should be. If third party lenses really improve, it just may force Nikon to step it up a notch on their own. I, for one, am not opposed to that. WM [/QUOTE]

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