Kson 25mm Kellner – An unusual eyepiece- but why?  Read on.

Details:

• Kson 1.25″ 3 element design
• 25mm, low power eyepiece made with the finest optical glass
• Includes quality hard plastic screw case (simply twist and unlock)
• Soft rubber eyecup for pleasant viewing comfort
• Pin prick point stars centerfield, comfortable to use, great eye relief.

This eyepiece has been reviewed by William Poalini, an Eyepiece Expert.  Here’s what he had to say (tested on a f/6.5):

“Off-axis sharpness is very good, up to 85%.  Eye relief was really comfortable with 10mm Kellner!  With the Kson 10mm Kellner my brow was just lightly touching the top of the eye guard and could easily see the entire FOV.  With the Kson’s longer ER this is a much much nicer eyepiece to use than the standard 10mm Plossls that come with scopes.This particular Kellner does not seem to be typical, having a rather large lens diameter when compared to the 25 Starbase or a vintage 25 Celestron Volcano Kellner.  So there is that difference, the ER feels a lot more comfortable with the KSONs, and the off-axis is tighter than the other Kellners.  So the optical prescription they are using for these 3-element Kellners appears to offer some better overall performance then other Kellner varieties.  Btw I did take them apart and they are indeed 3-element Kellner-like designs.”

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