[Leica] OT: EOS 70-200L sharpness

[qiao_li at mentor.com (Qiao Li)]

Hi Doug,

Thanks a lot for the explanation. I use Firefox 2.0, and noticed
the aliasing in dot-for-dot view by staring at the screen from
10cm away. :-)

Just noticed some white dots on the eye-lashes of the owl -- one
on top, two on the lower left. Were they from film grain or scanning?

Thanks.

Qiao


> Message: 28
> Date: Mon, 5 May 2008 14:32:53 -0400
> From: "wildlightphoto@earthlink.net" <wildlightphoto@earthlink.net>
> Subject: Re: [Leica] OT: EOS 70-200L sharpness
> To: lug@leica-users.org
> Message-ID: <380-22008515183253979@M2W019.mail2web.com>
> Content-Type: text/plain; charset=iso-8859-1
> 
> Qiao Li <qiao_li@mentor.com> wrote:
> 
> >
> >> 560mm f/6.8 @f/6.8 (a 1970 design) on the R8/DMR:
> >> http://wildlightphoto.com/birds/phasianidae/witu19.jpg
> >> http://wildlightphoto.com/birds/phasianidae/witu19crop.jpg
> >> 
> >> http://wildlightphoto.com/mammals/artiodactyls/dash01.jpg
> >> http://wildlightphoto.com/mammals/artiodactyls/dash01crop.jpg
> >> 
> >> 80-200mm Vario-Elmar @ 180mm & full aperture on Provia 400F:
> >> http://wildlightphoto.com/birds/strigidae/eeow02.jpg
> >> http://wildlightphoto.com/birds/strigidae/eeow02crop.jpg
> >
> 
> > Could you elaborate a little on how these pictures showed that DMR @
> > ISO400 is preferrable than Provia 400F?
> >
> > To my untrained (not due to modesty) eyes, the Provia 400F picture
> > seems to have more noise. But the DMR photo seems to show quite some
> > aliasing, like the reflection from the turkey's eye, the hair at its
> > back, and the highlights on the red caruncle(?)?
> 
> Be sure that your web browser is showing the turkey photo at full
> resolution.  IE and Safari both will re-size the picture to fit the window,
> resulting in visible aliasing.  Safari will then show you a magnifying lens
> with a "+" in the center; click on the picture and it will be full
> resolution.  IE will (eventually) show you a re-sizing icon in the lower
> right corner, click on this to see the picture at full resolution.
> 
> The grain/noise of 400F is one of the most significant problems I have with
> it.  The detail is more limited by the grain of the film than by the DMR's
> sensor so I can't enlarge & crop with 400F as much as I can with the DMR. 
> Film grain's random pattern acts like an anti-aliasing filter.  I should
> also try Provia 400X.
> 
> Doug Herr
> Birdman of Sacramento
> http://www.wildlightphoto.com