Tuesday, December 30, 2008

measuring doubles

After a brief chat with guru Geoff Gaherty, I am now under the impression that there are only 2 suitable eyepieces available for measuring double star separations and position angles: the Celestron or the Meade.

Celestron has a eyepiece that is laser-etched reticule and is illuminated. It is multi-coated. It is a 12.5mm Orthoscopic. It is popular it seems for photography but it can be used to measure position angles and separation of double stars. This is the item Tanguay referred to in his article. Khan Scope Centre it would be "very very difficult" to get.

Meade has something called the "astrometric." It is 12mm "MA" eyepiece, with illuminated reticule. That's a Modified Achromatic. Geoff made his feelings abundantly clear to me... Comes in a wired or wireless (i.e. battery-powered) format. In stock at Khan Scope Centre.

I found a brief review of the different types of reticule eyepieces...

No comments: