The 50/3.5 Neupolar is ok, but there are better lenses of that focal length (±) for photomacrography.

A fine lens for high magnification (10x to 34x on the MP-4) photomacrography.

Figure 2: Three Luminars and a Summar: Luminars are regarded as the ne plus ultra of lenses for photomacrography but Macro Nikkors are at least as good.

The results on the plate and the paper have been reproduced with a photomacrography set up (Fig., 3), in order to better look at the presence of the screen in the different steps.