| http://www.w3.org/ns/prov#value | - The doublet negative meniscus lens located on the object side of the first lens group G1 acts to reduce the Petzval sum, and is effective for correction of aberrations on the high and the low magnification side as well, because the doublet negative meniscus lens is so concave on the object side that off-axis aberrations such as coma and astigmatism can be reduced.
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