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echo: atm
to: ATM
from: jandersonlee{at}sbcglobal.net
date: 2003-07-22 08:50:12
subject: Re: ATM Ronchi webcam optics

From: "Jeff Anderson-Lee" 
To: "Bob May" , "atmlist"

Reply-To: "Jeff Anderson-Lee" 


"Bob May" 
> The use of a zoom lens from a 35m camera is a nice one.  You usually want
to
> have something in the 25-40mm range for a 1/4" imager like most of the
cheap
> stuff is to capture the image of the mirror on the imager well.
I deliberately look for 1/3" imagers (or larger).  I have a 30-105mm
zoom. I don't have a 25-40mm zoom. :-)

> If you are having grain problems with a webcam, the use of a brighter
light
> source should get rid of that problem unless it is already doing that with
> any image that it captures.

It's in all the images.  I have a 2600mcd led.

You don't notice it much as a web cam, but when you snap stills an blow
them up you sure do.

Jeff

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