So I decided to build a low-cost DIY amplifying eyepiece, to make it easier for visitors to observe deep-sky objects but ...

Rigorous, multi-night testing of the 20mm 100° Optimus eyepiece, deployed with a coma corrector in a 24-inch f/3.85 Newtonian reflector, consistently yielded exceptional observational performance ...

OK, so you've put your hands on a decent starter telescope. We're not talking about one of the cheap 50 mm aperture "department store" scopes, but a good quality 4 to 6-inch aperture scope. You've ...

Chief boast for the Leica Televid HD spotting scope is not just best-in-class performance, but, according to the German brand, ‘the world’s highest image brightness’. A bold claim indeed. Available ...

The magnification (or power) you will see through a given optical system depends on the telescope and the eyepiece. The simple formula is: Magnification = Focal length of telescope ÷ focal length of ...

IN recent years the coating or ‘blooming’ of lenses has been widely practised and has proved a most effective means of eliminating undesirable reflexions. The process has been applied to the ...