Quote:
Originally Posted by casstony
The difference between fpl53, fpl55, fcd100 and fluorite is negligible compared to how well the overall lens and cell are made.
Some fpl53 doublets and fpl51 triplets are fine for imaging too, such as the two scopes in my signature.
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Yes indeed, FPL-51 Triplets which include a Lanthanum partner element, are highly regarded. The TS115 being a good example.