My concerns deal with compensation for the
mechanical shutter and problems related to it.
Here's some issues:
#1 -- One roadblock that I faced was dealing with auto-exposure
mechanisms and curtain travel at higher shutter speeds (you end up with a
slit).
How are you dealing with this problem? My net result was that automation
would be
lost because of the lack of high shutter speeds controlled by the body.
#2 -- Back availability. To make an interchangable back one must order a
bunch
of parts from the manufacturer so that the units can be retrofitted in a
reasonable
amount of time. I wouldn't want to lose film usage. And if a mistake is
made in
modifying a back, one should have extras available.
#3 -- Interchangability. To add a dark slide isn't a really big mechanical
problem.
But it is a cost concern. The slide is needed to protect the sensor when
off the body.
Add another $50USD to the price of the unit. And also limit the # of
bodies that you
can afford to build them for.
#4 -- Sensor mounting. Because there's some rather convenient rails for
discerning
the film plane in every 35mm body, it's easy to build a set of standards
for the sensor
to ride on to maintain depth registration. One will simply need to
engineer a set of
standards so that it's a simplemechanism on any particular camera
body. What remains
is lateral motion. This will happen because of the needed motion to allow for
interchangability.
If you can resolve these in a cost-effective manner, go for it.
The circuit isn't much of a problem -- CCDs are almost OTS as far as
interfacing. And as was stated, go for a 4-AA NiMH system with the IBM
MicroDrive 1G. You'll have a nice market.
Also, I do C & Assembler programming, esp. with microcontrollers.
Let me know if you need assistance.
Collin
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