Hi,
Rob wrote:
"The big question is whethter all cameras are consistent in this
respect?
I am guessing many will see the existence of a film due to
a pressure
sensor in the film chamber as you describe, but some may
be as Mike says
where the film is detected by movement of a toothed wheel
or IR
detection of film movement over the film plate when the
take up spool is
advanced. The other thing is do all cameras using a
sensor in the film
chamber have the sensor in the same place? It makes sense
to use the DX
pins as you describe, but that does not mean all cameras
do it the
sensible way!!"
There may be a sensor in the cassette area of the body but it
will not be able to tell the camera that the film is
advancing... All the AF cameras I have seen automatically try
to advance film when the back is closed, even if there is no
cassette loaded. It seems to me that only DX sensors are in the
cassette area. Therefore, "silicon film" inserts for Pentax
will need some mechanical parts to simulate film presence.
These will be power consuming and prone to wear and tear. They
will also need to fit into a space designed for the film - a
very thin place, indeed. It's looking bad, to me.
mike
