For those that are interested....
Repost of what I have posted at
ButterflyCircle
40D and 1D3 LCD screen resolution
Both the screens have increased to 3 inches but retaining the same 230,000 pixel resulting in lesser pixel density which might have partially contributed to the rather fuzzy image on the LCD during post shot review when you zoom in all the way to 10X magnification.
The Camera system generated a low resolution thumbnail whenever you take a shot , be it on RAW ,sRAW or Jpeg and uses it when you choose post shot review . I suspect it is this system of using a low resolution Jpeg Thumbnail for post shot review that is the main cause of this fuzziness of the LCD image.
With the same 230,000 pixel spreading over a bigger 3 inch screen the thumbnail resolution that was good enough for the 2 inch LCD and perhaps the 2.5 inch LCD is now not good enough for a 3 inch LCD, particularly if f you zoom in all the way at 10X you are going to get a fairly pixelated view of the low resolution thumbnail.
The above has been verified in the last 3 days , pictures viewed thru the LCD review could be fuzzy but when the full resolution RAW or JPEG data were downloaded to the PC they are in perfect focus.
I have been experimenting on how best to overcome this and has found a possible solution to increase the sharpness if you need it to review how well you have focused .
The following
is recommended for RAW shooter NOT FOR JPEG shooter which might create post processing problem with the in camera Digic III sharpening your picture to whatever sharpness you've selected if you shoot in JPEG:
Bump up the sharpness setting to 6 or 7 instead of the default 3 under Standard Picture Style ( it can be any style, it really does not matter) With this sharpness boost the thumbnail image when zoom in 10 times provides reasonable sharpness for you to check your focus. This sharpness setting in the picture style has no effect on the RAW data .
I personally do not think the LCD resolution is the cause of this unsharp or fuzzy image in the LCD review mode, as in Live View mode the LCD screen is fully capable of rendering the actual scene pick up by the sensor and even if you zoom in all the way to 10x in live view mode the subject on you screen remains sharp with fine details.
It is more of an issue of using a low resolution thumbnail for post shot review.