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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