It shouldn't. Mine doesn't, not even if I give it a vigorous up-and-down shake.
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
-------------- Original message ----------------------
From: "Adam Long" <adamlong@xxxxxxxxxxxxxx>
[snip]
> As others have
> reported, the focus helicoid is sufficiently loose that it unwinds by itself
> when pointed straight down - a pain for macro work.
[snip]
>
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