Astrosib RC-250

Кто что расскажет про этого зверя?Astrosib RC-250 Ritchey-Chretien Astrosib RC-250. Mirror material: low expansion glass LK-7. 80mm image circle (for 60x60 film photography). Includes tube holder and plate, 13x80 finderscope, thread adapters and 2" star diagonal, off-axis guider (accept standard 1.25" eyepiece or CCD auto-guider). Standard Specification Aperture, mm250Focal length, mm2000Focal ratio1:8Optical schemeRitchey-ChretienFocuserHelicalWeight of the tube, kg15