On Tue, 15 Sep 1998 18:33:18 -0500, dgagnon@adrenaline.ca (David Gagnon) wrote:

>I have a Vivitar 100mm/f2.8 macro lens. Do you think that there a lot of
>difference between this lens and other macro lens like Nikon or Canon?
>
>I ask this question because I observe that my Vivitar is sharp but I can't
>compare with other lens.

Don't worry about it, especially if it looks sharp to you (and very
especially, if it was also far cheaper than the N/C alternatives).
I don't usually say this, since with most other types of lenses,
the difference in optical quality is very often quite obvious, but
good lenses of about 100mm are about the easiest lenses to design,
and virtually all, by almost any maker, are good...