Danubia K25 Kellner 25mm 1.25" Astro Telescope Eyepiece Fuji X100VI Accessories If you use a compact

If you use a compact drone like the DJI Mavic Mini 2 or Air 2

Minimum aperture: F22

mesh and zippers

the monocular is nitrogen-filled and waterproof

From an early stage in the lens design process

Danubia K25 Kellner 25mm 1.25" Astro Telescope Eyepiece Fuji X100VI Accessories If you use a compactThe Danubia K25 Kellner is a 25mm 1. 25" eyepiece for Astro Telescopes, which has been fully coated and offers a wider field of view, so is really useful for locating smaller objects in the night sky. It is easy to fit to a telescope with a 1. 25" diameter eyepiece aperture and the Kellner style of eyepiece, is an achromatic one, which has a three lens design. It gives excellent eye relief and is a terrific aid to extended night time viewing.