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[OM] Re: Simple question about 'clear' screens

Subject: [OM] Re: Simple question about 'clear' screens
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Wed, 04 May 2005 09:30:42 -0400
But, if the camera's eyepiece is focused on the plane of the screen (as 
it should be), if I remove the screen why wouldn't focusing the aerial 
image using the lens also focus on the film plane.

Chuck Norcutt

Alan Wood wrote:

> Chuck Norcutt wrote:
> 
>>I've never understood this clear screen/aerial image 
>>business.  Why is 
>>focusing the aerial image on the camera different from focusing the 
>>aerial image on a microsope or telescope?
>>
> 
> When you look through a microscope (assuming that you do not have a camera
> attached), it does not matter if the aerial image is exactly where the
> manufacturer intended - you just adjust the focus to suit your eyes.
> 
> However, when a camera is involved, then you must get the aerial image
> focused exactly on the cross-hairs, because the camera is designed so that
> when the aerial image is focused on the cross-hairs, then the real image is
> also focused on the film.
> 


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