5 = Super -- Sharp at All Apertures until Diffraction Limitset in with
Outstanding Contrast and Flare Resistance.

4 = Very Good -- Center 75% of the Image is Sharp Wide Open and by 2
stops down entire image is crisp w/very good contrast and flare
resistance at all apertures.

3 = Good -- May have to be stopped down more than 2 stops to get the
entire image sharp and contrast could be better but is still OK, Flare
resistance is not as good as it could be -- this is a lens you need to
be cautious using a teleconverter with.

2 = So-So -- Portraits and Family Photos -- Contrast is acceptable but
not nearly as good as a 3 or 4 rated lens, don't even think of using a
teleconverter. May have one good aperture for sharpness and contrast
but in general a lens strictly for amatuer use.

1 = Dog -- Only slightly better than an Instamatic Lens.