RobertOToole wrote: Also I plan to run a 5X test soon,... TU plan Fluor 5X (fresnel lens!) ....
Robert, This will be very interesting, too.
Please correct me, I read about them before. So I am not sure, of course... but according to this product-sheet, the technique is described as "Fly's eye lens" ---
http://www.optoteam.at/fileadmin/optote ... Lenses.pdf (this seems to be from year 2014)
only the higher Nikon TU Plan Fluor BD 20x, 50x and 100x lens seem to be equipped with this "Fly's eye lens" ---
This:
https://www.nikonmetrology.com/images/b ... v-n-de.pdf (German, late september 2017) shows the same specs for these lenses...
The phase-fresnel lenses also seem to be built in the higher enlarging TU lenses only (?)
Nikon does not list their LU Plan Fluor lenses anymore, so the TU lenses seem to be their successors (?).
Christian