On Thu, 19 Apr 2001, helen doane wrote:
> John Chennavasin wrote:
>
> > No, you can't. The EOS cameras use the DX info on the canister to determine
> > the number of exposures. This is why if you accidentally open the back, then
> > you will need to rewind the film, as the counter becomes fooled.
>
> I'm not so sure about that. My Elan II gets 25 complete frames on every roll of
> 24 exposure GA I put in it. On the rare occasion that I have opened the back
Ok, again... EOS 50E (Elan II) winds the film after a) the tension of the
film is hard or b) it has counted up to 36. That's why it always seems to
give 25 frames from 24, but never 37 from 36.
EOS 3 reads the length of the film from the DX code. It will not give more
than 24 frames from 24 frame film.
> frames and then displays "1" on the LCD. I suspect that it counts a
> predetermined number of perforations after the back is closed, and calls that
> frame 1. It then advances 8 perforations for each frame.
>
> The film, as it comes from the factory, only has perforations along one edge for
> the first few inches. If you place the end of the leader at the orange mark,
> the perforations have not yet started at the IR sensor. If you were "rolling
> your own" film, and cut it square at the leader end, I think the positioning
> would not be as accurate.
Sorry for being not that clear on this... the "hole" that I was referring
to, is exactly those perforations on the side of the film. I too believe
that it just counts a predefined number of those when the film is loaded.
As Helen Doane wrote, if you pull the film to the orange mark, (with most
films at least) none of those perforations are over the IR counter.
The camera will always pull the film the same length. But if you pull the
film further out than the orange mark, then the IR counter has already
missed some perforations, but still it will count as many of them. This
will of course result in a different loading of the film. This is the only
way I could think of that would enable you to get uneven loading of the
film with these cameras.
BTW, why would one pull the film farther than the orange mark anyways...?
Bye,
Hugo.
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** Hugo Gävert **
** [EMAIL PROTECTED] http://www.hut.fi/~hugo **
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