Quote:
Originally Posted by Robert_T
But have a read on the Stellarvue site about optics and you will read Vic's story how they are experimenting with other glasses and that they feel a number are equivalent to fpl53 (for aperture 130 and less) and they will be gradually moving to fcd100... starting with their svx130t... they have stocks of fpl53 they will use up and use that for larger lenses until Vic is confident it is equivalent. The core of the argument is that the strehl is more important than the glass type.
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The pairing glasses is also vital per Roland Christen.
One major problem these scope makers have with O'Hara is defects in the glass that come up in the handling and cause them to be rejected with no refunds from O'Hara. Also they can have difficulty in getting the glass they need in the size they want free from defects. It makes it hard for them.
That's why sometimes some sized scopes are discontinued due to supply issues.
Agema sells doublets that are supposed to be better performing than triplets.
These new APM Lanthanum and ED glass doublets review well.
So anything is possible.
Greg.