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[OM] Re: Sharp, but wierd

Subject: [OM] Re: Sharp, but wierd
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 14 May 2007 19:46:21 -0400
Great Jamie.  Can you please 'splain what he said?  Something about the 
fleas fleeing through the buffalo fleece being in sharp contrast to the 
resolution chart or something like that.

Chuck Norcutt


Jamie Costello wrote:
> Thanks, Schnozz - great, as usual ;-)  This is why I subscribe to this list
> ...
> 
> -----Original Message-----
> From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
> Of AG Schnozz
> Sent: Monday, May 14, 2007 2:32 PM
> To: olympus@xxxxxxxxxx
> Subject: [OM] Sharp, but wierd
> 
> 
> I was testing a new lens purchase last night and found a very strange
> artifact.
> 
> The lens is the outstanding Tokina AT-X 100-300 F4. I took out my
> testing chart, placed it on the wall and proceeded to test the lens
> at the common focal lengths (100, 135, 200, 300) and all apertures.
> 
> What I found was predictable--loss of contrast at the extreme
> apertures and excellent contrast and sharpness in the middle.  What
> wasn't so predictable was an "incompatibility" with RSE.  I'm
> suspecting that I have a setting screwed up someplace, but here goes.
> 
> The outside edge-sharpness of the converging lines in the test chart
> (same as DPReviews) is maintained all the way.  Very sharp.  However,
> within the lines, there is a total blocking of the detail within the
> converging lines at 1400 LPH.  At F5.6 to F11, the LPH tops out at
> about 1650 with tremendous apparant sharpness throughout.  In fact, I
> almost think that at 200mm and F8, this produces the sharpest image
> I've ever seen from the E-1.  I wonder if the extreme telecentricity
> of the telephoto design (thre rear-most element is a long ways from
> the sensor) breaks through whatever blurring the AA filter is
> providing.
> 
> So, when I get outside of the 5.6-11 range, there is excellent
> edge-sharpness (except for F4 and F32), but the detail within is
> mushed up.
> 
> However,
> 
> When opening up the files in Olympus Viewer, my LPH tops out at about
> 1600, but the blocking up is reduced some.  There is still a great
> loss of edge contrast at F4.
> 
> How does this manifest itself in real pictures?  I shot pictures of
> bison Saturday.  Those that were taken wide open had a "painterly
> effect" in the details--like the NR was cranked up too high.  F8
> yielded fur-details so tight that you could almost see the flees.
> 
> Wierd.  I'll be posting samples of this on my website tonight.
> 
> AG
> 
> 
>        
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