Re: Finding correct Cirkut gears by shooting.

[Colin Bullard <cirkutoz@xxxxxxxxxxx>]

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