[LRflex] Re: More contoversy!

David,
 
Thanks extremely interesting. Perhaps you could also post for comparisons a DMR 
R8 picture with the ISO set to 1600 so we can judge between underexposing and 
nominal highest iso on the DMR?
 
Regards,
Tim

        -----Original Message----- 
        From: leicareflex-bounce@xxxxxxxxxxxxx on behalf of David Young 
        Sent: Sat 25/02/2006 5:12 AM 
        To: LRflex 
        Cc: 
        Subject: [LRflex] More contoversy!
        
        

        Just when you thought it was safe to go back into the computer/camera 
room!
        
        OK.  We've talked before about the "work around" that Ted seems to hate
        so much, for the high ISO noise problem with the DM-R, as opposed to the
        simple cranking up the ISO with the Canon 20D.
        
        I now offer you three photographs.
        
        The first two were taken within minutes of each other, from the same
        vantage point, same DM-R (I can't afford two!) and with the same lens...
        the Telyt 400 f6.8 and 2x converter.   On the first shot (a squirrel)
        the ISO was set to 400, with the exposure compensation set to -3 stops. 
        The second shot (a woodpecker) was also at ISO 400, but with the
        exposure compensation set to -2 stops.   Both shots were developed with
        identical parameters, other than the exposure compensation, which was Ʊ
        and Æ° stops, respectively... bringing them back to "normal" exposure. 
        No more. No less.  Thus, we have two shots with **effective** ISO speeds
        of 3200 and 1600, respectively.
        
        As a "control", I have found a similar style shot (of a Rufous-naped
        Wren), taken with the 80~200/f4 Vario-Elmar and 2x converter, on the
        Canon 20D at ISO 3200... with no exposure compensation.
        
        This 'control' shot was "developed" with Silkypix, with identical
        parameters as the two above.
        
        All three were converted from RAW to .TIF files with Silkypix, and then
        to .jpg files in PS7.  All three had the unsharp mask (131%, 0.2 pixel
        Radius and 0 Threshold) applied.  No other image manipulation of any
        kind (other than to add copyright notices) has been done.  No noise
        reduction software of any kind has been used on any of these shots.
        
        The large files are all in excess of 1mb, and may cause long download
        times for dial-up users.  (Sorry!)  And a screen resolution of 1024x768
        will make life easier.
        
        Noise is most visible in the background areas of a photo where large,
        out of focus areas exist.  All three shots meet this requirement, though
        the background colours do change a bit.  I'm sorry, Jerry, but this is
        not as scientific as either you or I would like, but it's the best I
        could do, from photos at hand.  I think it still tells a valid story!
        
        I make no claims about superior noise levels. Certainly, the DM-R at ISO
        1600 is not a usable camera.  However, to my eye, both the shots at the
        *effective* ISOs of 1600 and 3200 are noticeably superior to the Canon
        at ISO 3200.   Moreover, I think all three (which could all be further
        improved with Neat Image or Noise Ninja) have less noise than film at
        the same ISO!
        
        All of this fallderall can be seen at:
        http://www3.telus.net/~telyt/Noise.htm
        
        Once again... Nomex suit on... Kevlar vest in place.
        
        You take a look.  You tell me what you see.
        
        Cheers!
        
        --
        David Young,
        Logan Lake, BC   
        CANADA.
        
        Personal Web-site at: http://www3.telus.net/~telyt
        Leica Reflex Forum web-page: http://www3.telus.net/~telyt/lrflex.htm
        
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