Quote:
Originally Posted by Profiler
One real difference between the EPs is the use of Lanthanum in the Pentax/Vixen.
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Since we don't know what glass types Televue uses you can't make that claim.
Your premise that Lanthanum necessarily gives special performance is false - Lanthanum is just one group of optical glasses a designer can choose from.
XW's above 10mm perform very differently to Delos in the 10" dob owned by the OP.(curvature, not coma)