AstroBKK

Links

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Aperture / Design / Price comparison

Definitely several other parameters are important but this table may give a first idea. 

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Note: made by mid-2020.

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Manufacturers: 

http://rcopticalsystems.com/telescopes/14truss.html

https://www.officinastellare.com/

https://www.telescope.com/Orion/Orion-12-Truss-Tube-Ritchey-Chretien-Astrograph/rc/2160/p/131539.uts

https://www.apm-telescopes.de/en/telescopes/reflecting-telescopes-ota/ritchey-chretien/ts-ritchey-chretien-14-f-8-optical-tube-truss-tube.html

https://www.astronomics.com/astro-tech-12-f-8-truss-tube-ritchey-chretien-optical-tube.html?___SID=U

https://www.telescopengineering.com/telescope/apo180fl-f-7/

https://www.obsessiontelescopes.com/obsessed/22UC_owners/index.php

https://www.astrosysteme.com/products/telescopes/asa600

https://planewave.com/products-page/telescopes/14-inch-cdk-optical-tube-assembly/

https://www.orionoptics.co.uk/ODK/odk14.html#odk14config

http://agoptical.com/telescopes/