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<blockquote data-quote="STM" data-source="post: 138532" data-attributes="member: 12827">DX crop factor has nothing to do with sharpness. Pixel density has a lot more to do with sharpness. If you want to own the finest portrait lens ever made by anyone, get a used 105mm f/2.5 AI/AIS Nikkor. It is manual focus and you can only do aperture priority and manual (maybe program, I am not sure, I never used anything but manual with it), but you will be very hard pressed to find a portrait lens that can even achieve parity with it, much less surpass it. I have a 105mm f/1.8 AIS Nikkor now, but had an f/2.5 for over 20 years and I think it is an even match all things considered, but all I gained was speed, not quality.The 105mm f/2.5 P non-AI Nikkor was first introduced in 1959 and the last version, the AIS, is still the standard, used by professionals and serious amateurs alike, against which all medium telephoto portrait lenses are judged.</blockquote>

[QUOTE="STM, post: 138532, member: 12827"] DX crop factor has nothing to do with sharpness. Pixel density has a lot more to do with sharpness. If you want to own the[I] finest portrait lens ever made [U]by anyone[/U][/I], get a used 105mm f/2.5 AI/AIS Nikkor. It is manual focus and you can only do aperture priority and manual (maybe program, I am not sure, I never used anything but manual with it), but you will be very hard pressed to find a portrait lens that can even achieve [I]parity[/I] with it, much less surpass it. I have a 105mm f/1.8 AIS Nikkor now, but had an f/2.5 for over 20 years and I think it is an even match all things considered, but all I gained was speed, not quality. The 105mm f/2.5 P non-AI Nikkor was first introduced in 1959 and the last version, the AIS, is [I]still[/I] the standard, used by professionals and serious amateurs alike, against which all medium telephoto portrait lenses are judged. [/QUOTE]

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