You're adding a new variable to the equation. Only change one
variable at a time! Of course, if you change the sensor size, or the
number of pixels per sensor, things change. Perhaps I didn't define
the terms carefully enough and thus opened myself to a challenge!
On the other hand, I don't know anything about the algorithm that's
used in a digital zoom situation. I assumed that they simply used an
internal crop. That may not be the case, but if it is, my statement
applies. As I understand it, a crop in photoshop simply throws away
the pixel information outside the crop. I assumed that a digital
zoom does the same thing.
Roger
Roger Eichhorn
[EMAIL PROTECTED]
On 13 Jun 2006, at 20:17, Ken Lin wrote:
That sounds like false economy to me. You can crop a full frame
exposure to a 1.3 crop in PhotoShop or some other editing program and
achieve the same result. It's entirely equivalent to having a
"digital zoom."
Huh? Assuming an 8.2 MP full frame (not that exists right now)
vs. 8.2 MP
cropped sensor, digital zoom of the full frame sensor image loose
number of
pixels in the image when compared to the larger image from the cropped
sensor, that translates to loss of useable information in the image
area of
interest, and that's why digital zoom in little point-and-shoot or
video
cameras should only be used as a last resort.
Digital zoom only gives you larger pixels, not more information for
the
pixel.
Unless we are talking about a 16 (or even higher) megapixel full frame
sensor vs. a smaller MP cropped sensor, then I'd agree with your
statement,
however we need to factor in the resolving quality of the lens
optics as it
will come into play as well, I suspect I'll get better image
quality from a
medium to high end lens with a cropped sensor than cropping in
PhotoShop
from a higher pixel count full frame sensor.
Ken
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