Its actually a 21mm premium eyepiece for astronomical telescopes. Pentax has a good reputation in telescopes and eyepieces but unfortunately, they are no longer doing this.
The other Pentax 21mm...
- Thread starter airconvent
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Its actually a 21mm premium eyepiece for astronomical telescopes. Pentax has a good reputation in telescopes and eyepieces but unfortunately, they are no longer doing this.
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