The very low price makes already skeptical, quite rightly. While the processing is solid, let the optical properties - Low to glass without optical compensation - but left much to be desired.
While D + 1 lens is still usable, can already be seen in the D + 2 strong chromatic errors (color fringing), which makes the image appear much blurred and muddy. Since the greater magnification brings no benefits. With the D + 4 / D + 10 lenses, this effect intensified - together with other aberrations due to the lens thickness - still much! With the D + 10 can my Canon EOS DSR with telephoto zoom lens no longer focus so completely useless.
Compared to D + 4 for example the Raynox DCR-150 Macro Conversion brings a plurality of lenses with D + 4.8 dramatically better results. Otherwise, you should invest in ordinary D + 1 / D + 2 lenses with coating a little more. Larger D-values can be personalized with individual lenses - just in this large lens diameter - realize no sense because the physics does not simply with.
