The Ostara S-HR range of Plössl eyepieces provide excellent value for money with high optical and build quality.
Improved definition compared to the original Ostara HR Plössl range.
Fully Multicoated Optics
4 Lens Elements in 2 Groups
Light weight Aluminium Alloy Body
Apparent FOV 50º
Standard size 1.25″ / 31.77mm fitting (suitable for the majority of astronomical scopes and some spotting scopes – ask if unsure).
At launch available in 4 sizes (4mm, 10mm, 30mm, 40mm).
Supplied in plastic cases for protection/storage.
Plossl eyepieces provide a wide field of view and are therefore ideal for a wide range of observational applications such as planetary and deep sky viewing.
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.