On 30 Jan 2001, at 21:37, Ed Mathews wrote:
> Hi Peter,
> I've found (and have since, come to accept) the same thing about the
> ZX5N. But I've taken it a little further, and tested it with every lens I
> own. It's surprising, but it's actually consistently quite accurate with
> some and consistently poor with others.
This is interesting Ed, are there any common physical attributes between the
lenses that seem to respond similarly? Weight, floating elements, focus
travel?
Thanks to Peter for the testing, I have no doubt about your findings, I made
some interesting observations whilst performing lens tests along the same
lines. I found that even removing my hand from under the focus ring on a
manual focus lens slightly affected focus (particularly prevalent on lenses like
the A100f2.8 macro) even though the lens/camera under test was set on a
very heavy tripod. I ended up adjusting focus with my two fingers like pincers
pushed into the side of the lens.
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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