Re: slit width experiments

[Bill Glickman <bglick@xxxxxxxx>]

Ron

     Why would reducing the slit size cause banding?  Less light =  slower
rotation = less of a problem with banding?   Is this being used at auto
exposure or manual?

      With the 220 VR banding is more common at very high speeds, 1/250 th,
or when using auto exposure...the drastic slowing and speeding of the motor
can cause this......Is this a mechanical problem unique to cirkuits?   Have
you found an optimal slit size for sharpness, or is it simply the smaller
the sharper?

Bill G



----- Original Message -----
From: "Ron Klein" <panorama@xxxxxxx>
To: <panorama-l@xxxxxxxxxxxxxxxxx>
Sent: Sunday, September 03, 2000 9:10 PM
Subject: slit width experiments


> > The film in my camera isn't getting enough light..... so this wouldn't
> work!  Anyone played with Cirkut slit widths?
>
> Clayton:
>
> I have done modest experimentation with changing the slit width.  I took a
> #10 that had a 1/4 inch slit and changed it to 3/8 inch with only a very
> slight loss of sharpness.  In the other direction, I have reduced the slit
> width to 1/8 inch and had much sharper images, but indeed banding became a
> noticeable problem.
>
> If you are trying to shoot photos in low light conditions, it would be
much
> better to have a longer exposure time rather than a wider slit.  The
> electric motor combo that I am playing with currently has four speeds that
> are 1/6, 1/3, 3/4, and 1 and 3/4 seconds.  Odd combinations, but they seem
> to give me everything I need for low light shooting.  If I need faster
> speeds for groups, I can reduce the slit to 1/8 inch wide and get 1/15
> second.  If you need more details about the new cirkut motor I have
> designed, feel free to write me a separate email note.
>
> Ron Klein
> panorama@xxxxxxx
>
>
>