Also, using an extension tube incurs some light loss, whereas a diopter
doesn't. I think there's probably a comparable loss of DOF. Depending on
the length of the extension and lens combo, it can be more awkward to handle.
Ken
At 04:42 PM 5/16/2005, you wrote:
On Mon, 16 May 2005 08:42:39 -0600 Francis Zhou <[EMAIL PROTECTED]>
writes:
> I apologize if this is a "beat to death" question. I only take
occasional
> close up shots. I am not ready to buy a proper macro lens and intend to
use
> either Canon 500D close up filter or EF25 II extension tube on my
70-200/2.8
> (non-IS). All I need is a quick summary of pros and cons or a pointer
to a
> link with such information.
If you use an extension tube on a zoom lens, then zooming will change
focus and the subject-to-lens distance.
If you use a diopter (500D) on a zoom lens, zooming will (mostly) retain
focus and will change magnification.
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