Lets define 'Tack Sharp'

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Has anyone else looked at this, or something like it yet.

http://www.phaseone.com/en/Downloads/Sample-images.aspx

Pain in the butts registration/log-in required for download. But what it is, is an untouched sample from the highest end or close to it? Phase One medium format system.

If being able to identify individual eye lashes is a definition of tack sharp, then here we can identify individual mascara blobs on individual eye lashes in the small area of perfect focus. It's so high resolution to an absurd degree that it would be easier to retouch and up-size a smaller resolution file or to throw out a lot of detail because it's capture gross microscopic qualities that only science wants to see... Still pretty awesome.
 
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neuroanatomist said:
They're 200x200 pixel 100% crops, and Norman's spot on. Yes, the forum compresses attachments, so neither look as good as under the loupe in Aperture.

Is your 24-105mm just a bit softer or just a slightly OOF shot? You've posted some pretty "tack sharp" shots from your 24-105mm in the past I seem to recall.
 
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Meh said:
neuroanatomist said:
They're 200x200 pixel 100% crops, and Norman's spot on. Yes, the forum compresses attachments, so neither look as good as under the loupe in Aperture.

Is your 24-105mm just a bit softer or just a slightly OOF shot? You've posted some pretty "tack sharp" shots from your 24-105mm in the past I seem to recall.

The eye in each shot is at approximately the same relative position in the frame, but both are a bit away from the center. The 24-105mm can look sharp in scaled-down shots, but it's not nearly as sharp as the 70-200mm II. That does illustrate the point that much of this is splitting hairs (or eyelashes, as the case may be). Tack-sharpness is not the be-all-end-all, and a difference of 200-300 lw/ph on an Imatest result usually doesn't mean much in real-world shots. Although it's not 'tack sharp' the 24-105mm delivers good results, which is what matters.
 
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The sharpest photos I've ever taken have been illuminated by bright strobes, enough the point where I no longer worry whether the lens is sharp or not. If I want a sharp photos, I need bright lights.

Here's an example of what I mean, 100% crop of a photo taken with the nifty fifty:
enOMz.png
 
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I honestly don't know the reasons behind it -- it's just something I've experienced over the years, and I've assumed its similar to the reason that it's easier for the human eye to make out details in bright light than in dim.
 
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