Joe Gwinn wrote:
>>
The theory does still hold. Nor was it nonsense back then.
The issue is that if the resolution of the lens much exceeds the spacing
between pixels (of the same color), it will allow moire beats (seen as color
fringes) to happen whenever the pitch of some pattern in the subject happens to
be more or less the same as and aligned with the pixel pattern of the CCD.
In mathematical terms, what's happening is that the CCD "undersamples" the
pattern in the subject, causing "aliasing" (those beats), and the only solution
is to "low-pass filter" (blur) the image hitting the CCD chip. The necessary
blurring can be done in a number of ways.
<<
I am not disagreeing with you Joe et al, but it would seem that an algorithm
(software) would be able to sense and compensate to correct this problem,
thereby making the "better" slr lens more practical for digital.
John Cwiklinski
_____________________________________________________________
Get 25MB, POP3, Spam Filtering with LYCOS MAIL PLUS for $19.95/year.
http://login.mail.lycos.com/brandPage.shtml?pageId=plus&ref=lmtplus
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|