ASKAR 71F f/6.9 APO REFRACTOR OPTIONS:OTA ONLY 5nm Highspeed F/2 filter is

5nm Highspeed F/2 filter is a precision-grade narrowband filter with a high transmission at the Oxygen-III line at 500

WARNING: This filter alone cannot be used for direct solar observation

allowing you to take advantage of the high sensitivity in the ultraviolet and near infrared range of modern CMOS cameras

The views are much more impressive than what you’d expect from such a compact instrument

ASKAR 71F f/6.9 APO REFRACTOR OPTIONS:OTA ONLY 5nm Highspeed F/2 filter isThe Askar 71F is an apochromatic quadruplet flat field astrograph that offers high performance for an exceptionally low price. The quadruplet design makes it perfect for both visual observation and astrophotography. The objective lens features an element of extra low dispersion glass (ED) that minimizes chromatic aberration. The Askar 71F is a versatile instrument and excels not just at imaging, but as a grab & go visual telescope. Using an erecting