[rollei_list] Re: "different types of black boxes" (was: OT / prove it !)
- From: Nick Roberts <nickbroberts@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 4 Apr 2005 14:06:02 +0100 (BST)
--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
> I think you are assuming something that is not
> backed up
> by the evidence.
Probably.
>I think the main reason Zeiss-Ikon
> used the
> Contax type shutter is that they had the design.
> While the
> Contax shutter is much more sophisticated than the
> Mirroflex
> shutter they both operate on the same idea of the
> gear train
> timer. I think the reason Leica did not have a
> 1/1000th
> speed on the earliest FP cameras is that with the
> slow film
> of the time no one would have used it much.
> Actually, the
> Leica design is well suited to fast shutter speeds
> as is
> proven by similar modern shutters with 1/2000th
> second
> speeds or even more. The main problem is the limit
> on the
> speed of the curtains due to their mass and the
> minimum slit
> width that can be used due to diffraction at the
> slit. For
> speeds higher than 1/1000 the speed of the curtains
> must be
> raised. This is done in modern cameras. It also has
> the
> advantage that flash fill using strobe can be used
> at higher
> speeds because the highest speed at which the entire
> frame
> is exposed at once is greater.
> The fact is that the Leica type shutter acheives
> the same
> end as the Contax with far fewer parts and a much
> simpler
> design. The Contax shutter has little advantage
> other than
> running the short direction and that could be done
> using a
> Leica type shutter if the camera was shaped
> differently.
Agreed.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
Nick
Send instant messages to your online friends http://uk.messenger.yahoo.com
Other related posts:
