There was a Pentax 125mm F5 that also had a reducer available that was rare that made it F3. something.
Bruce Karbal of Astromart had one for several years and it was like a 125mm Tak FSQ. Seemed like a fabulous scope with a helical focuser.
Not sure this is the same scope. Search in Astromart and you'll see photos of it.
Greg.
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