FRA400
FRA400
Welcome to use brand new ASKAR FRA series! The FRA, which stands for “FLATFIELD REFRACTIVE ASTRAGRAPH”, is a refractive astrograph designed
for built-in flat field correction. FRA also used in visual observation, this series creates versatile high-quality flat frame images for astrophotography,
is the few great telescope of versatile optical tube.
  • In accordance with the easy conversion of lens parameters, our first FRA series product is the f/5.6 quintuplet astrograph with 400mm focal length and 72mm aperture. Two ED (Extra-low Dispersion) glass elements are also included to effectively suppress chromatic aberration. FRA400 features a 44mm full frame image circle.

  • Adopts modern telescope optical tube design, features retractable dew shield, 3" large high-precision rack-and-pinion focuser with 360°rotator, features M68 X 1 thread, 2" adapter ring and 1.25"eyepiece adapter. The focuser also features high precision micro-adjustment for observation and photography.

  • It’s excellent in controlling and possibly avoiding chromatic aberrations, the image quality is also optimized to satisfy the customers of requirement.
     
    It’s worth mentioning that FRA 400/5.6 has a pair of multifunctional attachment tube rings owns the patent, it’s not all style and no substance though, the FRA shows well-conceived design and has a practical three-sided mounting platform, which is convenient for attaching various accessories for photography.


     
    ASKAR FRA 400/5.6 APO Astrograph has a back focus of 140mm, no need to calculate the distance, when attach your photographic equipment, you will see an in-focus image.
     
    Being stocky and portable, ASKAR FRA400/5.6 can combine with various accessories, also simple to use, is an effective and very versatile photo / visual companion.


    A focal ratio of F5.6 is relatively ‘fast’ for telescope or astrophotography, however, in order to meet the needs of pro-level astronomers, we specially designed a special ultra-short focal reducer FRA72RD, combine use with FRA400/5.6, you can achieve a optically faster F3.9 focal ratio to reduce the exposure time, full frame is also supported, which is very rare type of refractor telescopes. 
     
    FRA400/5.6 is designed to “astrograph should meet satisfactory observation experience to enjoy capturing extended deep-sky objects, offering simpler configuration and better optical performance”. It would provide a significantly better user experience.










    ASKAR FRA 400 / 5.6