This10mm focal length 1.25 inch eyepiece is ideal for all types of telescopes: reflector, refractor, and catadioptrics such as Maksutov-Cassegrains (Mak-Cass)
An excellent telescope ocular for higher-power planetary and lunar observation
Offers a 52 degree apparent field of view for clear, sharp images of impressively high contrast
Multi-coated for maximum light throughput
Great for observing small planetary nebulas and globular star clusters
With a wide 50-deg apparent field, our Sirius Plossl line of eyepieces provide clear, sharp images of impressively high contrast. They’re suitable all telescope types: reflector, refractor, and catadioptric. Each 4-element Sirius Plossl is multi-coated for excellent light transmission. Lens edges are blackened to reduce scattering of stray light and maximize contrast. Lenses are mounted in black anodized aluminum housings with 1.25″ chrome-plated brass barrels. Each is fitted with rubber eyeguards and internally threaded to accept standard filters.
The Ostara HR range of Plossl eyepieces provide excellent value for money with high optical and build quality. Fully coated to reduce reflections with standard astro 1.25″ fitting (suitable for the majority of astronomical scopes and some spotting scopes – ask if unsure).
Available in 7 sizes (5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 40mm – see other listings for other sizes).
Supplied in plastic cases for protection/storage.
Plossl eyepieces provide a wide field of view and are therefore ideal for a wide rage of observational applications such as planetary and deep sky viewing.
This listing is for the 10mm eyepiece only – group picture is for illustration of the sizes available
What Magnification is this Eyepiece?
The magnification produced by an eyepiece depends on the optical system it is used in. In a standard astronomical telescope the magnification is found by dividing the focal length of the main tube by that of the eyepiece. For example, a 1000mm scope tube used with a 10mm eyepiece gives 1000/10 = 100x magnification. Used with a 5mm eyepiece gives 1000/5 = 200x.