Frequently Asked Questions
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Q1: What is a modified achromatic eyepiece?
A: A Modified Achromatic (MA) Eyepiece (aka Kellner eyepiece) consists of a two-element achromatic ocular lens mounted about 3/4 inch ahead of a plano-convex objective lens. The design has been around since about 1849. It's especially subject to internal reflection and light loss, but modern anti-reflective coatings have helped to reduce this. In low power, the MA or Kellner eyepiece is suitable for small- to medium-aperture telescopes.
Q2: I have an older Jason by bushnell telescope. It is approximately 5 inches in dia. and 34 inches long. It lacks all but one eyepiece. Will the Meade 40 mm modified achromatic .965 in. eyepiece set work, or is there another recommendation?
A: The Meade 40 mm modified achromatic .965 in. eyepiece will certainly work, providing the telescope's focuser is 0.965 inch in diameter. To be certain, you'd want to measure the focuser.
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