Telescopes (กล้องดูดาว) > Celestron >

ITEM # 91075 ROWE-ACKERMANN SCHMIDT ASTROGRAPH
 
ITEM # 91075 ROWE-ACKERMANN SCHMIDT ASTROGRAPH
 

ITEM # 91075 ROWE-ACKERMANN SCHMIDT ASTROGRAPH 
  • 11-inch f/2.2 optical design with rare-earth glass for images free of false color, coma, and field curvature
  • 43.3mm optimized image circle maintains pinpoint stars to the far corners of even the largest astroimaging sensors, while the usable field extends even further to 52 mm for larger format sensors.
  • Custom engineered linear brass focuser bearing reduces image shift, while dual-speed 10:1 FeatherTouch Micro Focus Knob provides the most precise focusing
  • Quiet, high-output 12V MagLev fan reduces cooldown time and blocks dust
  • Common camera adapters (T-thread and M48) included for easy attachment to popular CCD and DSLR cameras
  • SPECIFICATIONS

    Optical DesignRowe-Ackermann Schmidt
    Aperture279 mm
    Focal Length620 mm
    Focal Ratio2.22
    Backfocus from front lens assembly72.80 mm
    Backfocus from included camera adapters55 mm
    Central obstruction diameter114 mm
    FinderscopeNot included
    Light Gathering Power (Compared to human eye)1588x
    Optical CoatingsStarBright XLT 
    Total Telescope Kit Weight43 lbs
    Included items11-inch optical tube assembly, 42 mm T-thread camera adapter, 48 mm camera adapter
    Resolution (Rayleigh)0.5 arc seconds
    Resolution (Dawes)0.41 arc seconds
    Optical Tube Length33 in