Archived posting to the Leica Users Group, 2004/09/21

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Subject: [Leica] new 1ds mark II
From: jonathan at (Jonathan Borden)
Date: Tue Sep 21 18:16:03 2004
References: <007d01c4a00d$d5886000$> <007d01c4a00d$d5886000$> <> <007f01c4a01c$8546bab0$87d86c18@ted>

Ted Grant wrote:

> So maybe the truth is, a 5-8 mgp is just fine for 99.9% of us, so why 
> are
> people knocking their brains out being sucked into the larger is 
> better mgp
> myth when you can't see the difference?

99.9% of people seem to make 4x6 prints and in this case you are 
correct. 5 mp is perfectly fine even with a bit of a crop.

Assuming that there is no point in printing at >  300 dpi (a number 
which is not set in stone, but what many knowledgeable people consider) 
and that there are visible difference ***with some images*** at dpi < 

An 8x11.5 is roughly 10 MP in size at 300 dpi.

A 13x19 is roughly 22 MP in size at 300 dpi.

Larger prints require even more pixels.

What is the limit?

At some point you reach the lpmm resolution of the lens. Better lenses 
will resolve more information with higher mp chips of a given size. If 
you have not so good of a lens, there is no point in more MP (you can 
always smooth any pixel jaggies in photoshop).

At some point you also reach the diffraction limits of the lens, and of 
the light waves themselves so there is a definite limit to how good 
lenses might be made for a given coverage (e.g. 35mm or APS).

Of course if your image is blurry and/or out of focus to start out with 
more MP ain't going to fix that.


Replies: Reply from tedgrant at (Ted Grant) ([Leica] new 1ds mark II)
In reply to: Message from bdcolen at (B. D. Colen) ([Leica] new 1ds mark II)
Message from bladman99 at (Dan C) ([Leica] new 1ds mark II)
Message from tedgrant at (Ted Grant) ([Leica] new 1ds mark II)