TS Optics Erfle 20mm 70° 1,25″ se záměrným křížem

Astronomy Eye Patch for Telescope Observing Yes, you will look like a pirate. But we are fairly confident that after your first night using this eye patch, you will not leave home without it. It is one of the simplest and yet most effective accessories an amateur astronomer can own - a small addition to your kit that makes every observing session noticeably more comfortable while protecting both your eyes and your facial muscles from unnecessary strain. Why Does Squinting Cause Fatigue? When looking through a telescope eyepiece, most observers instinctively close or squint the eye that is not being...