An abbreviation for "optical tube assembly", i.e., a telecope tube without a mount.
Optical Tube Assembly (the tube part of the telescope, not including the mount) Back to top of glossary
Organic Trade Association. The Organic Trade Association is a membership-based business association that focuses on the organic business community in North America. The OTA's mission is to promote and protect the growth of organic trade to benefit the environment, farmers, the public, and the economy. The OTA is a member of IFOAM.
Optical Tube Assembly. The telescope body with the lenses and focuser is what makes up an OTA.
The tube that holds your mirrors and/or lenses.
Optical Telescope Assembly
Optical tube assembly. The housing and optical system of a telescope. It does not include the mount, eyepieces or other accessories.
Abbreviation for Optical Tube Assembly. It is normally considered to consist of the tube itself, the focuser and the optical train from the objective lens ( refractor), primary mirror ( reflector), or corrector plate (catadioptrics) up to, but not including, the eyepiece.