In your car analogy..., there will be no loss of power due to simply adding
couplings to the prop shaft. If you now cause the coupling to experience an
angular displacement (centerline to centerline) relative to the prop shaft,
there will be an infinitesimally small loss.
Ken Waller
----- Original Message -----
From: Todd Stanley <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, April 26, 2001 9:12 PM
Subject: Re: OT: autofocus motor
>
> I know there will be a loss of power, I just don't expect it to be very
> much. I suppose if you have a TC/extension tubes with the shaft that goes
> through, try turning it with a screw driver and see how much resistance
> there is without a lens on. I would expect it to be very little, but I
> could be wrong (I don't have an AF TC/extension tube)
>
> Todd
>
> At 07:42 PM 4/26/01 -0400, you wrote:
> >... Correct me if I'm wrong, but I think the AF
> >works just like a car transmission or a prop shaft. If you add couplings,
> >there will be a loss in power reaching its end.
> >You're wrong!
> >
> >Ken Waller
> >----- Original Message -----
> >From: Eduardo Carone Costa J�nior <[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>
> >Sent: Thursday, April 19, 2001 10:32 PM
> >Subject: Re: OT: autofocus motor
> >
> >
> >> Todd wrote:
> >> >
> >> > I would think so. I would also think that motors in the camera may
fail
> >> > sooner if large heavy lenses are used a lot, as then the likely
> >> > underpowered motor will have to work harder, trying to do the job of
a
> >> > larger motor.
> >> >
> >> > Todd
> >>
> >> That's exactly what I think about it.
> >> Do you know anything concerning Pentax AF motors? I mean, if they can
be
> >> considered rugged enough to stand some larger lenses. Have you heard of
> >any
> >> AF motor failure that can be attributed to the extensive use of large
> >> lenses?
> >> I can't help but think that, despite being used all the time, unlike AF
> >> motors mounted directly into lenses, the body mounted AF motor can
benefit
> >> from a larger physical space provided by the body itself.
> >> Another point is the use of teleconverters and extension tubes that are
AF
> >> compatible. Due to the adding of couplings, the stress on the motor
would
> >> also be increased. Do you agree? Correct me if I'm wrong, but I think
the
> >AF
> >> works just like a car transmission or a prop shaft. If you add
couplings,
> >> there will be a loss in power reaching its end.
> >>
>
> >
> -
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>
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