Pray for 'CLEAR SKIES'

[Ally8446]

Received my new GSO 2.5x barlow today. WAYHAY. Unfortunately our weather is upside down. 20+ degrees last week and snow this week. On a serious note, the barlow is called a '3 element' and I, obviously wrongly, assumed that meant 3 lenses. Upon looking down the barlow there only appears to be one lens, so why is it called 3 element ? GIVE ME CLEAR SKIES PLEASE !

[Stephen]

It means there are three pieces of glass (each of which is a lens albeit there may be some funny shape ones!) sandwiched together to create the final optical "lens"

[JamesF]

Were you to take the barlow apart by removing the lens retaining ring (hint, don't do this really you'd find what appears to be a thick glass lens, then a thin spacer and then another, thinner, glass lens. On close inspection the first, thick, lens reveals itself to be two lenses cemented together. Those three lenses are the three elements.

James

[Ally8446]

Cheers guys. Curiousity qwashed