from NPZOptics . exotic design, but actually quite practical. aperture: 250mm focal length: 1500mm Ritchie-Chretien telescope, built by AB Balluesam, 1500mm focal length light is reflected to eyepiece via nasmyth focus (eyepiece is aligned to declination axis) according to the scheme of the Novosibirsk designer Yu.A. Klevtsov. Since 2002, there have appeared: TAL-200K, TAL-150K and the most powerful TAL-250K to date. Another new direction - the production of apochromatic refractors with improved image quality, started in 2009 with the TAL-125-5 APO telescope. Thus, the production line of TAL telescopes covers all major areas of telescopic construction and offers quality tools for beginners,and for the trained amateurs of astronomy. but how does it compare with truss tube construction?