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The basic lenses are of just one element construction, some are multi-
coated to reduce reflection however the majority are just optical glass.
This is fine if you just want to experiment with close-up photography and
provided you understand some of the limitations they will give you
excellent results like the image below taken with such a set.
Close-up using the #2 close-up lens and the camera at 108mm equivalent focal
length
These lenses do suffer from color fringes (chromatic aberration) and
from edge definition fall off because of the lens curvature of field. This is
especially so with the higher value ones (#4 and #10). If you look at an
enlargement of the above image you will see both effects!
Using a small aperture like f7.1 will help to reduce the edge distortion.
Evidence of chromatic
aberration and edge
definition fall off with the #2
lens.
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