Askar 140APO f/7 Triplet

Whether you're an amateur astronomer or a professional astrophotographer, the Askar 140APO will provide you with a high-quality user experience and help you go deeper into the mysteries of the universe.

The Askar 140APO is an OTA with a 140mm aperture, 980mm focal length, and f/7 native focal ratio.

The aperture of 140mm gives it an inherent advantage in terms of light-gathering power, resolution, brightness, and contrast, allowing the photographer to gather more light and present more details and brighter objects in the image. Along with more light coming into the astrograph, the limiting magnitude can reach 12.5.

The Askar 140APO adopts a triplet air-spaced APO lens design, including one piece of ED glass.

 The Askar APO series employs special optical designs and multiple lens elements to correct chromatic aberration, naturally providing higher-quality object details and color accuracy.

In the refractor's element structure, increasing the number of lens elements and designing lens combinations can effectively improve chromatic aberration correction. However, this also means increased production costs and design complexity.

ED glass, also known as low-dispersion glass, is a type of optical glass specifically designed to reduce chromatic aberration.