Skywatcher make a wide array of eyepieces from the extravagantly expensive right down to what could be considered the budget range. Their sp plossl series falls squarely into the latter category. A low cost eyepiece that can be used on a plethora of astronomical objects. The 12.5mm focal length makes this eyepiece better suited for deep sky observations although it can also offer pleasing views of the moon and planets (Saturn especially stands out and looks great at low-medium powers). Skywatcher have used a typical Plossl configuration of lenses (or elements as they are referred to). Four elements make up the sp's optical system, two groups of two closely ...  Read the complete review