Clarify objective specs with inclusion of conjugate distance.
This MR:
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Further highlights need for objective to be Plan corrected -
Mentions that the parfocal length is sometime specified as a conjugate distance (195mm for 45mm parfocal length) -
Highlights that 185mm conjugate distance objectives (often with just 185 in product description) are not the correct objective for the standard optics module.
Closes #377 (closed)