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Morton, Masuyamas - having had a couple - most definitely are not plossls. They're more similar to the Vixen LV series (also 5 elements) as well as later copies such as Celestron XCel, some of which - not all - are excellent value IMHO.
Plossls are a 4-element design, basically two plano-convex achromatic doublets with the convex surfaces face to face (i.e. the plano sides are outwards, facing the focal plane, and the eye).
Despite their simplicity plossls also happen to be a excellent match for the average amateur newtonian, if you like moderate fields of view.They can be a poor match for fast refractors as the field curvature won't match. On f/10 or slower SCT's or Maks they'll be fine.
Last edited by Wavytone; 31-01-2016 at 10:34 PM.
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