8x21 Foldable Roof-Prism Binoculars Aperture_4. 170mm + Side window and partially open

Side window and partially open roof provide lots of ventilation

making them ideal for both visual observing and astrophotography

while the included 25mm Plössl eyepiece and 1

this device will reduce your f-ratio by 0

50mm Aperture Telescope: Explore the Moon’s cratered surface

8x21 Foldable Roof-Prism Binoculars Aperture_4. 170mm + Side window and partially openThese pocket binoculars have a compact and attractive design. The fully coated BK 7 optics and solid mechanics enable a true color picture replication. These models have diopter compensation and foldable eyepieces for spectacle wearers as well as a functional bag.