Re: I Camera Flatness

[Tom Droege <tdroege@veriomail.com>]

I thought to look at one more thing. Looking at a small box near the center 
of the image I got:

Mean 186, sigma 29

At the corner:

Mean -309, sigma 28.3

So the sigma in a small box is comparable to the sigma over the whole 
image. To me, this means that the noise is swamping the variations due to 
the optics. At least it is of comparable magnitude.

When I look, I notice that most of the image is pretty close to the mean. 
There is a high point at the middle, and low points at the corners, but 
most of the image is average. I think this is what Elliot tried to do.

Tom Droege

At 02:05 PM 3/29/01 -0600, you wrote:
Michael has replied to my comments about the flatness of the lenses. This 
has prompted a little work.
First, I want you all to recall how the lenses were designed. In 
discussions with Elliot, we chose to optimize the lenses in a circle 
tangent to the sides of the 2048x2048 square. That is, the corners were 
left out of the