We bring you two more online utilities designed to help you get the most out of your telescope and optical accessories, both for visual use and astroimaging with digital single-lens reflex cameras.
Far from always being a featureless blue-green dot in backyard telescopes, both amateur and professional astronomers have recently imaged extreme weather features on Uranus.
Visual observers now have the benefit of wide-field eyepieces but astro-imagers are somewhat limited to the size of their CCD chip and when it comes to imaging large objects, they must take several images and build a mosaic.