On Thu, 24 May 2001 07:08:57 EDT, you wrote:
> Both my Canon zooms - the 28-135 IS and the 75-300 - have this slight
> play in the zoom barrels. My Tamron 20-40, which has a much shorter
> "throw, " does not. The 28-90mm that comes in the Elan 7 kit, has a
> *lot* of play. I'd almost call it "slop."
>
>
> Ken Durling >>
>
>So then this is normal. It does seem to work OK. What I don't understand is
>doesn't this 'play' mean that some of the lens elements are always going to
>be misaligned with others? Or is this degree of misalignment not of any
>consequense? Will it be seen if big enlargements were to be made?
Howard,
I can't really answer your question from an authoritative technical
POV, but I can tell you that the pictures from my 28-135 and the
Tamron 20-40 are much sharper than those from the 28-90. Now of
course this could have to do with simply superior optics, but the
barrel slop may have something to do with it. The 28-135 and the
75-300 have comparable barrel play, but the 28-135 is a bit sharper,
so there I think it's pure optics. The 28-135 and the 20-40 are
comparable in sharpness, with perhaps a slight edge to the 20-40, and
the 20-40 has no barrel play, so as you can see, it's hard to say what
effect it has. I did notice that someone else reported no play in
their 28-105, so you may want to check yours out.
Ken Durling
Website http://home.earthlink.net/~kdurling/
Alternate e-mail: [EMAIL PROTECTED]
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