Sharpstar 2" Triplet 0.95x Reducer / Coma Corrector for f/3-f/6 Newtonian Reflectors with M48 Thread
Sharpstar 2" 0.95× coma corrector can be applied to most marketable Newtonian reflective astrographs. It’s of high quality and easy to use. Sharpstar 2" 0.95× coma corrector is designed for APS-C imaging circles(28mm), suitable for Newtonian reflectors with focal ratio between f/3 and f/6, and aperture size from 150mm to 600mm. The reduction factor is 0.95×, thus it can reduce the original f/4, f/5 and f/6 respectively to f/3.8, f/4.75 and f/5.7, effectively shortening the exposure time. Besides, it can improve the star shapes. The diameter of stars in the center of the field can be limited within 10um.
Specifications
Application:150-600mm, f/3-3/6 parabolic reflectors Reduction factor:0.95× Image circle:44mm(maximum), 28mm(optimal) Lens:triplet structure Outer diameter:50.8mm(2") Back focus:56mm(starting from the field-stop-ring to the focal plane) Length:79.7mm Coating:full-surface multi-layer coatings Weight:0.22kg
iOptron iPolar Electronics Polarscope (Rear USB port) for CEM26 / GEM28
Introducing iOptron iPolarTM - a high precision, easy to use electronics polarscope (e-PS).
What makes iPolar unique? 1. Can be easily installed inside the RA shaft on all iOptron equatorial mounts (except SmartEQ Pro). 2. Can be used on any mounts with adapters either internally or externally. 3. USB plug and play (no driver needed) 4. Works globally, no need to set northern and southern hemisphere. 5. No visible Polaris (north) or Sigma Octantis (south) necessary. 6. No need to rotate the mount during polar align.
iPolar is a smart electronic polarscope for everyone.