A quick look at the resolution lp/mm makes me wonder if that is center, edge, corner or an average of some kind ... also, at what apertures?
My experience with my Nikon 20/2.8 AIS is that it has sharper central resolution than my Oly 21/3.5, but the Oly has more even sharpness across the frame. I find my Nikon\'s to be designed midway between my Oly\'s and my C/Y\'s in terms of sharpness distribution, vignetting, contrast, etc. The story repeats itself with my 28mm, 50mm and portrait glass.
Optics are always a series of compromises / tradeoffs. Engineers know this and brands typically design fairly consistently toward their philosophical drawing style. In that regard, the \'single\' value of resolution doesn\'t tell the whole story ... \'grain of salt\' might be warranted. IIRC, slrgear didn\'t render glowing test results of zeiss either.
I recommend taking a look at those some lenses in question over on www.slrgear.com ... not sure I\'d come to a \'floor mopping\' conclusion after looking there. Particularly taking notice of the sharpness distribution mapping variance between the Nikon\'s & Zeiss. Central sharpness seems to typically be a horse race till you start moving outward at wider opertures. Pretty consistent with what my Nikons do.
A quick look at the resolution lp/mm makes me wonder if that is center, edge, corner or an average of some kind ... also, at what apertures?
My experience with my Nikon 20/28 AIS is that it has sharper central resolution than my Oly 21/3.5, but the Oly has more even sharpness across the frame. I find my Nikon\'s to be designed midway between my Oly\'s and my C/Y\'s in terms of sharpness distribution, vignetting, contrast, etc. The story repeats itself with my 28mm, 50mm and portrait glass.
Optics are always a series of compromises / tradeoffs. Engineers know this and brands typically design fairly consistently toward their philosophical drawing style. In that regard, the \'single\' value of resolution doesn\'t tell the whole story ... \'grain of salt\' might be warranted. IIRC, slrgear didn\'t render glowing test results of zeiss either.
I recommend taking a look at those some lenses in question over on www.slrgear.com ... not sure I\'d come to a \'floor mopping\' conclusion after looking there. Particularly taking notice of the sharpness distribution mapping variance between the Nikon\'s & Zeiss. Central sharpness seems to typically be a horse race till you start moving outward at wider opertures. Pretty consistent with what my Nikons do.
A quick look at the resolution lp/mm makes me wonder if that is center, edge, corner or an average of some kind.
My experience with my Nikon 20/28 AIS is that it has sharper central resolution than my Oly 21/3.5, but the Oly has more even sharpness across the frame. I find my Nikon\'s to be designed midway between my Oly\'s and my C/Y\'s in terms of sharpness distribution, vignetting, contrast, etc. The story repeats itself with my 28mm, 50mm and portrait glass.
Optics are always a series of compromises / tradeoffs. Engineers know this and brands typically design fairly consistently toward their philosophical drawing style. In that regard, the \'single\' value of resolution doesn\'t tell the whole story ... \'grain of salt\' might be warranted. IIRC, slrgear didn\'t render glowing test results of zeiss either.
I recommend taking a look at those some lenses in question over on www.slrgear.com ... not sure I\'d come to a \'floor mopping\' conclusion after looking there. Particularly taking notice of the sharpness distribution mapping variance between the Nikon\'s & Zeiss
A quick look at the resolution lp/mm makes me wonder if that is center, edge, corner or an average of some kind.
My experience with my Nikon 20/28 AIS is that it has sharper central resolution than my Oly 21/3.5, but the Oly has more even sharpness across the frame. I find my Nikon\'s to be designed midway between my Oly\'s and my C/Y\'s in terms of sharpness distribution, vignetting, contrast, etc. The story repeats itself with my 28mm, 50mm and portrait glass.
Optics are always a series of compromises / tradeoffs. Engineers know this and brands typically design fairly consistently toward their philosophical drawing style. In that regard, the \'single\' value of resolution doesn\'t tell the whole story ... \'grain of salt\' might be warranted. IIRC, slrgear didn\'t render glowing test results of zeiss either.
I recommend taking a look at those some lenses in question over on www.slrgear.com ... not sure I\'d come to a \'floor mopping\' conclusion after looking there.
A quick look at the resolution lp/mm makes me wonder if that is center, edge, corner or an average of some kind.
My experience with my Nikon 20/28 AIS is that it has sharper central resolution than my Oly 21/3.5, but the Oly has more even sharpness across the frame. I find my Nikon\'s to be designed midway between my Oly\'s and my C/Y\'s in terms of sharpness, vignetting, contrast, etc. The story repeats itself with my 28mm, 50mm and portrait glass.
Optics are always a series of compromises / tradeoffs. Engineers know this and brands typically design fairly consistently toward their philosophical drawing style. In that regard, the \'single\' value of resolution doesn\'t tell the whole story ... \'grain of salt\' might be warranted. IIRC, slrgear didn\'t render glowing test results of zeiss either.
I recommend taking a look at those some lenses in question over on www.slrgear.com ... not sure I\'d come to a \'floor mopping\' conclusion after looking there.
A quick look at the resolution lp/mm makes me wonder if that is center, edge, corner or an average of some kind.
My experience with my Nikon 20/28 AIS is that it has sharper central resolution than my Oly 21/3.5, but the Oly has more even sharpness across the frame. I find my Nikon\'s to be designed midway between my Oly\'s and my C/Y\'s in terms of sharpness, vignetting, contrast, etc. The story repeats itself with my 28mm, 50mm and portrait glass.
Optics are always a series of compromises / tradeoffs. Engineers know this and brands typically design fairly consistently toward their philosophical drawing style. In that regard, the \'single\' value of resolution doesn\'t tell the whole story ... \'grain of salt\' might be warranted. IIRC, slrgear didn\'t render glowing test results of zeiss either.
Feb 17, 2011 at 04:48 PM
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