Astronomy on MSN10 天
Oberwerk’s binoculars is really a pair of 5-inch refractors
What if you could find binoculars big enough to qualify as small telescopes? Get ready for the BT–127XL–SD apochromatic ...
Astronomy on MSN6 天
Fall in love with new astronomy products this month
Fluorite triplet TakahashiTokyo, Japan The ​​FCT-65D is a low-dispersion Fluorite Triplet refractor. It has a 400mm focal length and a f/6.2 focal ratio, and a high Strehl ratio of .98. It also comes ...