Al Paslow Astronomy Collection

Images and events of personal interest.

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Series of early eyepieces. Image by E. Ramos
The 16mm Konig has been one of the popular of the University Optics eyepieces ever and is the most common focal length of the Konig series. This example also a "flat head" or "flat top" is most likely from the late 1970's or newer. Early examples were also flat heads but were serial numbered on the top cap. They too were coated examples as this one, but with out the checkerboard or Zebra ring which barely is visble in this picture.
This is a 28mm RKE and a 15mm RKE showing differences in the barrels. The 28mm is in a class by itself as the threads on the barrel are external in assembling the eyepiece. The 15mm however are internal to connect the upper portion of the eyepiece that contains the optics to the lower portion.
Here is an Alvan Clark 0.2 inch eyepiece. The Clarks used a barrel size of 1-1/8 inches.
This is an original eyepiece that came with the Cave Telescope. Orthoscopic 10.5 mm eyepiece with a 50 degree field of view. All glass air surfaces are hard coated to improve light transparency and are true Orthoscopic in design, having a triple achromatic field lens and a single eye lens. This occular is a fine example of a quality eyepiece of its day and made in Japan. Quite heavy by todays standards and in very good to excellent condition. The barrel of this example is in especially fine shape.
Series of early eyepieces. Image by E. Ramos
Series of early eyepieces. Image by E. Ramos
Series of early eyepieces. Image by E. Ramos
See photo in original gallery.
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This site features some great images.