Re: [TASS] Flat fielding

[Tom Droege <droege@WWA.COM>]

I built one of the Norman Mulhant type light boxes for the Mark IV.  It is
still sitting on the bench waiting for that problem to reach the top of the
queue.

Tom Droege

At 09:39 AM 9/10/99 -0700, you wrote:
>Andrew Bennett wrote:
>>
>
>> >You can't point it at a "dome flat" spot because it does not point.
>>
>> If the camera won't turn to point at the dome, the dome must turn
>> to point at the camera.
>
>
>There was talk on this list maybe a year or so ago about making
>some "integrating spheres".  This is a big hollow ball painted
>flat white inside (special white paint)  There is a hole for the
>lens to look in and another to let in a point light source.  For
>the Mk III the sphere needs to be about 18 inch diameter.
>There was another type of flat target suggested that used multiple
>defusing screens.
>I don't think anyone actually built one of these devices.  Neither
>would be expensive
>
>--
>   --Chris Albertson             home: chrisja@jps.net
>     Redondo Beach, California   work: calbertson@logicon.com
>
>