This unusual eyepiece is an extraordinary performer in longer focal length telescopes

Details:

• Kson 1.25″ Erfle Eyepiece
• Sophisticated 5 Element Design
• 26mm, low power eyepiece made with the finest optical glass
• Includes quality hard plastic screw case (simply twist and unlock)
• Solid, metal manufacture
• Soft rubber eyecup for pleasant viewing comfort
• Wider field compared to Ortho’s and Plossl’s, these work best in slower (f/7) telescopes
• These eyepieces are not just coated, but Fully-Multi-Coated

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%.  Looking at various nebula and clusters the real story came to light as star points in the off-axis took a back seat to the visual contrast of the view.  The Kson 26 Erfle was clearly the shining star here and its views were just wonderful.  M42 was so stark against the background and lots of mottled details in the nebula.  Was really a beautiful view.

I know everyone likes to give simple 3-element designs a hard time, and when we talk Erfles you would think they were horrible, but [it] performed admirably in the f/6.25 Apo quite nicely across its 50-ish degree AFOVs.  Like my results in the f/8 scopes, they showed nicely pinpoint stars out to 75-80% of the FOV.  Only in that last 15-20% did some astigmatism start to show.  But even there it was mild not deforming the star point of any significance until that last 5-10%.  So really they put up quite enjoyable views!”