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Plastic lens elements
Hi Daniel,
The issue I have with plastic lens elements is that they are much more prone and easier to scratching than glass.
They also tend to yellow more readily over a quicker time.
Lastly, I think plastic lens have a different refractive index, which actually may help reduce violet fringing and spherical aberration in short tube refractors that I experimented with.
I agree, Plossls are really Dialsight/symmetrical but mass eyepiece manufacturers (from China) should label them correctly as Dialsight/Symmetrical and not as Plossls when they are not.
Kind regards,
Bill
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