Re: Slit width - Distance to fim plane

[Willem-Jan Markerink <w.j.markerink@xxxxx>]

On 29 Jun 99 at 10:37, David Dobbs wrote:

> Hello, I have designed a 180 degree camera design with the drum 2x the focal
> length. The 2x drum yields a image 2*pi*FL at 360 degrees. I plan to place the
> adjustable slit about 7.5mm from the film drum plane. To solve the banding problem
> the camera will have a wind up spring. Several question have presented themselves
> in the design process. Where is the nodal point? 

The (a?) nodal point procedure was posted here a few months ago, see 
my homepage for a copy:

http://www.a1.nl/phomepag/markerink/mainpage.htm

> How does one calculate the true focal length?

That ought to be verifyable through magnification/distance 
ratios....


 

--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]