I was about to write, "No, it can't be done". But you got me
thinking....
What you _could_ do is bend the end of the chrome lever in the bottom
that works between the mirror lifting arm and the first curtain release
lever so that pressing the release button (thereby releasing the
mirror/aperture arm) doesn't result in firing the shutter. Then using a
rod pushed through a hole between the body casting and the front casing
(there's actually a small gap there already), you could push the chrome
lever to trip the first curtain release lever any time thereafter.
Then, to return the camera to "normal" working order, just re-form (a
fancy word for "bend") or replace the chrome lever!
Walt Wayman wrote:
> There's a question or two at the end of this, so bear with me,
> please, particularly you who fearlessly fiddle with the innards of
> an OM-1.
>
> Last summer, I came into possession of a 1250mm f/10 Celestron
> lens. I was pleasantly surprised when test shots showed it
> actually to be an honest f/10 and, for a mirror lens, to be
> amazingly sharp and contrasty. I've gotten very good results with
> it and an OM-4, particularly when using the self-timer to get
> mirror lockup and aperture prefire and with everything on a heavy
> tripod and a five-pound bag of lead shot weighing down both camera
> and lens.
>
> But that procedure doesn't work too well when shooting stuff that
> moves. For instance, as one hypothetical example, I may know a
> particular bird lands on a particular limb frequently, so I aim at
> and carefully focus on that limb, and I wait. Bird comes; I trip
> shutter, beginning self-timer. You should see my stunning
> portfolio of empty tree limbs from which a bird had flown just two
> beep-beeps before the shutter finally fired. I exhausted my
> extensive vocabulary of profanity and had begun to make up cuss
> words.
>
> So I switched to using an OM-1 with this lens, shooting with the
> mirror locked up so I wouldn't have to suffer through a bleeping
> interminable wait. But it occurred to me that, unlike using the
> self-timer with an OM-4, the OM-1's aperture stop-down mechanism
> is still operating in the camera, causing whatever bit of
> vibration that mechanism produces. Since this is a fixed
> aperture, T-mount lens, there's no diaphragm to stop down, so
> that's just more unnecessary mechanical motion.
>
> Now the questions:
>
> 1. What would be involved in disabling that function?
> 2. If one did so, or had it done, would it be easily reversible?
> 3. Would it be an OM crime to do so?
> 4. If the answer to 3 is yes, what would be the fine or the time?
> 5. Would it be worth doing?
>
> Curious minds want to know.
>
> Walt
>
>
>
>
>
>
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