Re: Finding correct Cirkut gears by shooting.

["Robert J. Lang or Hope Conley Lang" <bobhope@xxxxxxxxxxxxxxxx>]

Hi Colin!

	Sounds like a nice easy method!

	Regards,

	Bob Lang



At 07:52 PM 1/25/00 +1100, you wrote:
>Leonard
>
>Simplest method is to get a 36" square sheet of white cardboard and make a
black cross about 2" wide across the centre of it. The vertical and
horizontal lines will be the
>same length. This is your target. Photograph it at whatever distance you
want to check for your gear. Process the film and when both the vertical
and horizontal lines are
>the same length you have the right gear. ( The vertical line always stays
the same height, the horizontal line will be either longer or shorter
depending on the gear
>used)  Hows that Ron?
>
> Colin Bullard
>Melba Studios
>Sydney Australia.....its heartening to see all this discussion on our
venerable Cirkuts Guys, keep it up!
>
>
>Leonard Robertson wrote:
>
>> I've been told I can find the right gear for a lens (without knowing the
>> exact focal length), by shooting film at different focus settings, and
>> picking the sharpest image. As I recall, it is best to shoot something like
>> a sign where letters "smear" if the focus is wrong. I have Mr. Lipari's
>> formulas so I can figure the approximate gear as a starting point. I'll be
>> shooting on 220 film in my #8 Circut, and it seems I can get several short
>> test shots per roll. Is this idea at all workable, or should I just go
>> ahead and build a nodal slide to find the exact focal length? If this
>> method works, any hints will be appreciated. Thanks.
>>

           Leonard
>
>