Not so long ago Olympus was talking about a planned 12 MP maximum for
the 4/3 sensor. If you read the test of the DZ 50/2 you can see exactly
where the 12 MP maximum comes from. At f/4.5 the lens is resolving 1500
line pairs vertically toward the outside and about 1600 dead center.
Come off f/4.5 though and resolution starts to drop. A 4/3 sensor that
can resolve 1500 line pairs vertically has pixel dimensions of 3000 x
4000 or... 12 MP.
Since the DZ 50/2 must be one of the better lenses, if it can't go
beyond 12 MP it doesn't make much sense to go to even smaller pixels.
The same is true in the Canyon camp. I suspect that there are precious
few lenses that can resolve the 15 MP of the 50D sensor and the same
holds for the 21 MP sensor of the 5D Mk II (although the 50/1.4 can do
it across the full sensor at f/5.6-f/8 but not above or below that).
So, the sensors are now outresolving the lenses and even the best
lenses. I guess we don't need any more pixels... but that won't prevent
the manufacturers from giving us more. :-)
Chuck Norcutt
Brian Swale wrote:
> Thank you all for helping me focus my mind and consider, about the DZ
> 50/2.
>
> I went to this site
>
> http://www.dpreview.com/lensreviews/olympus _50_2_o20
>
> and downloaded three of the big images taken with it. Maybe they didn't use
> a tripod; - whatever.
>
> I found they benefited significantly from sharpening,and I found myself
> thinking about close-up images I have taken using the E-1 with the Zuiko
> 100/2 ( focuses down to 70cm) and the Zuiko 50/3.5.)
>
> I don't know that the DZ 50/2 is all that much better in practice. Surely
> they
> will hit the second-hand market place again.
>
> Considering that I hope to have an Obsession 617 in my hands some time
> before next Christmas, I might just keep my scarce $650NZ until then.
>
> Thanks for all your input.
>
> Brian Swale.
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