ASKAR 71F f/6.9 APO REFRACTOR OPTIONS:OTA ONLY 135 mm from M54 thread

135 mm from M54 thread

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

The Askar 185APO is available either on its own

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

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

ASKAR 71F f/6.9 APO REFRACTOR OPTIONS:OTA ONLY 135 mm from M54 threadThe 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