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Eyepiece end caps
on the subject of eye relief again, it is important that all eyepieces have a soft cap at the exit pupil end of the assembly.
I have spent a lot of time making a set of three very large Huygenian eyepieces for the Great Melbourne Telescope. The focal lengths of these eyepieces are 105mm, 150mm and 211mm respectively and their design is bound by heritage restraints.
The original eyepieces had metal caps but the new set of caps have been made on a 3D printer. They are acceptable from a heritage point of view because they look the same as the original components.
Barry
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