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Optimized Optical Design: Explore 100 Degree Series hyper-wide eyepieces are optimized through each design
As you can see
iOptron made big improvements on the SkyGuider Pro’s removable alt-azimuth base
The Sun will look a pleasing orange color through the Celestron EclipSmart Solar Filter
even at high magnifications or when using the filter far ahead of the focal plane (ie
William Optics Red Cat71 - RedCat 71 mm f/4.9 Refractor - T-C-71RD Astronomy Books Optimized Optical Design: Explore 100Hurry, just one left at an amazing price! The William Optics RedCat refractor continues to be immensely popular, but if you'd like more aperture, check out the 71 mm f 4. 9 RedCat! This beautifully designed Petzval astrograph sports four optical elements in a three group configuration (2 1 1). The doublet front group is made of FPL 53 glass, followed by one central element and a rear lens. This optical design produces a flat image plane on its own,
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