100mm 90° Giant Observation Binoculars with 18mm UF eyepieces

Description This 2-element binocular offers huge light grasp and extremely high contrast thanks to an achromatic air-gap doublet lens design.   The colour correction is so good they have been described as semi-APO, even though they do not contain ED glass.    For astronomy, high power nature viewing, or coastal observation, we cannot find a better price/performance ratio 100mm binocular. The difference in light grasp compared to 70 or 80mm binoculars is immediately visible, as is the higher resolution. In fact, these lenses outperform most spotting scopes and achromatic doublet telescopes of similar aperture.  Imagine the light gathering power of two 4" refractors - one for each eye! Use your favourite 1.25" astro eyepieces for lunar and deepsky observation or even light pollution filters, which isn't possible with normal binoculars. The included 18mm Ultra-flat eyepieces give a 65° field of view, and the overall brightness of the images is quite surprising compared with using binovi