The whole question of lens sharpness...

Started Jun 12, 2013 | Discussions thread
BertIverson
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I borrowed Mark Scott Abeln's diagram (see his post today -- below)
In reply to BertIverson, Jun 17, 2013

BertIverson wrote:

gdourado wrote:

... Do we really need more and more sharpness? For portraits, events, models... is super sharpness even a good thing? How much is enough? ...

My take on this is simple. If one can fill the frame (avoiding cropping), lens sharpness is usually irrelevant when viewing on a 2.4MP monitor. Viewing a 16MP shot on a 2.4MP monitor means about 4-6 sensor pixels are rendered into 1 pixel on the monitor. In the case of a zoom lens, it only needs to be real sharp at the extreme long end. At lesser FL one will fill the frame (see above)...

Mark does a great job of explaining sharpness/contrast in lenses. See his post below.

I have borrowed half of Mark's diagram to demonstrate my OP statement about viewing high resolution photos on 2.1/2.3/2.4 MP monitors. To illustrate, let's assume a 20MP shot viewed on a 2.2MP monitor (9 photo pixels are rendered as 1 monitor pixel)

9 photo pixels averaged when a 20 MP shot is rendered on a 2.2 MP monitor

One can see that the blurriness is now seen at the monitor pixel level instead of the photo pixel level. The lens blurriness is therefore reduced 3:1 compared to viewing on a 20MP monitor or large 300 PPI print.

NOTE: My original post was regarding the need for "sharp" lenses when one views photos  on these 2.x MP monitors. (not when pixel peeping or printing large at 300 PPI)

Sorry to revive this rather raucous thread but Mark's test photo intrigued me to see this alleged effect for myself.

Cheers,
Bert

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