Archived posting to the Leica Users Group, 2009/11/20

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Subject: [Leica] Thought question re antialiasing
From: tgray at 125px.com (Tim Gray)
Date: Fri, 20 Nov 2009 11:44:11 -0500
References: <494971.52240.qm@web83908.mail.sp1.yahoo.com> <20091120032721.GA2535@d242.scdc1.swarthmore.edu> <4796FFE1-49FB-45D9-8E75-A381DCB355E3@ameritech.net> <20091120035749.GB2535@d242.scdc1.swarthmore.edu> <36172e5a0911192044s197d811ao879d833085c1a661@mail.gmail.com> <E8CE85D5-0958-4B15-B96E-11BDEABCCA9F@ameritech.net>

On Fri 20, Nov'09 at  1:09 AM -0500, Dante Stella wrote:
> Kodak is a little bit cagey with the info on the offset lenses on the 
> KAF-10500 and its bigger brother.  I think the microlenses are tailored to 
> the application.

I think you are correct.

> But given the tighter pixel pitch and even higher-resolution lenses, one 
> would expect it to.

I don't think this is true all the time.  You can get moire/aliasing in any 
system.  You can always construct a scenario in which a frequency is just 
right to produce aliasing unless your cutoff filter is ideal and filters out 
all frequencies higher than half the sampling frequency.

In fact, one could argue that the tighter the pixel pitch (higher frequency 
sampling), the less moire/aliasing you might actually get.  After all, 
things like diffraction, as you stated earlier, come into play more at 
tighter pixel pitch, which act as a natural AA filter.

Also, I'm not sure how you use the 14n and M8/M9, but a lot of M users seem 
to go handheld at very slow shutter speeds a lot of time.  Motion blur can 
act as an efficient AA filter as well.


In reply to: Message from dstella1 at ameritech.net (Dante Stella) ([Leica] Thought question re antialiasing)
Message from tgray at 125px.com (Tim Gray) ([Leica] Thought question re antialiasing)
Message from dstella1 at ameritech.net (Dante Stella) ([Leica] Thought question re antialiasing)
Message from tgray at 125px.com (Tim Gray) ([Leica] Thought question re antialiasing)
Message from hopsternew at gmail.com (Geoff Hopkinson) ([Leica] Thought question re antialiasing)
Message from dstella1 at ameritech.net (Dante Stella) ([Leica] Thought question re antialiasing)