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Unless you are purchasing some expensive eyepieces, I would say it is more a matter of convienience rather than less expense

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Well, for me its even more than that. Convenience?- certainly. Expensive EP pairs?- got 'em. But having a PxS attached accomplishes a raft of benefits:
1) Less care concerns with handling of EPs in-the-field due to magnification changes,
2) Those mag changes accomplished more quickly & easily, both up and down, encouraging more detailed & extended study of a given object,
3) Less frequent issues with rebalancing the scope *during* those EP change-outs,
4) Maintaining eye-relief benefit of longer FL EPs during high-mag viewing,
5) No need to fiddle with EP positions for merging views- once done for a pair, it stays done done,
6) Offers ability to wisely select a *few* quality EPs such that their mag ranges stagger in such a way as to optimize YOUR specific viewing preferences! Can land you effective FLs not offered by conventional EP offerings.

Granted, these might all fit under the heading of "convenience", but i thot it was worth expanding & expounding

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Welcome to 2009!

May your skies, your mind, and your heart all be steady & clear!

* * 15" F4.55 Starsplitter Dob * *

Pacheco State Park
Fremont Peak

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