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 an Eyepiece Expert.  Here’s what he had to say (tested on a f/6.5):

“Off-axis sharpness is very good, up to 90%.  Eye relief was really comfortable.  The 25 Kellner is fully multicoated.  Using Sirius as the test subject I could not induce an ghosting or flare.  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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