Pentax Kellner 40mm

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Brand and Model:Pentax Kellner 40mm
Price ($USD):Discontinued
Focal Length:40 mm
Barrel Size:1.25 in
Apparent FOV:40.0 degrees
Field Stop Dia.:0.0 mm
Eye Relief:0 mm
Weight (lbs):

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Pentax Kellner 40mm
A wonderful eyepiece! It has a 1.5" diameter barrel so you'll need an adapter. These were not sold in the US, most come second hand from Japan. If you must have the ultimate in light throughput, contrast and resolution this is the one to own. It comes at the expense of field of view however.

Overall Rating: 10
Weight: 1 (Unreliable Vote)
By: Anonymous (
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