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  1. #11

    Join Date
    Dec 2009
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    Sorry I didn't have enough time for more detail in my previous post.
    The noise you're hearing as you change slow speeds with the shutter cocked is the slow-speeds escapement wheel and its gear train spinning VERY fast. This increased speed of rotation with rapid changes of rotation direction (and increased force applied to other parts) does increase wear rate.
    Without the shutter cocked this part of the mechanism is disengaged, so no "scritchy" noise.
    As QG says the slow-speed train is engaged usually around 1/15. You hear the wheel & gears spin during exposure, just a lot slower.
    It's not something to be unduly worried about - I just prefer my shutters to last as long as possible.

  2. #12

    Join Date
    Jan 2007
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    That explanation makes total sense. Not to be difficult, but it seems this extra wear would be different in switching from faster to slower speeds, rather than the other way around. No?

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