Criterion 4000 eyepieces
- Old Man
Certainly, you can use other eyepieces, any brand but, first, determine the barrel diameter of the eyepieces that your old B&L uses. If it is just under 1", it is the old, nearly obsolete .965" size and finding other eyepieces, especially finding other quality eyepieces, will be difficult. If the barrel measures 1.25", you are in luck, since that is standard when it comes to telescope eyepieces and you can use any brand, as long as it is 1.25" barrel size.
As to all numbers and so on, read my article at, Ten Top Telescope Eyepiece Questions.
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