|
Hi Graeme
Look up the PST Stage 1 conversion in your preferred search engine. That will explain what is involved in converting a refractor to a Ha scope.
Basically, in my case, it is the black box of an PST scope fitted to the 2" drawtube via an adapter that screws into the front of the Etalon Filter then into the drawtube of an 4" / 102mm f9 refractor with a Baader ERF in a cell that fits into the dewshield at the front of the refractor. The black box consists of the Etalon, a tunable filter at the front with an internal pentaprism that is used to achieve focus then the 5mm blocking filter at the bottom of the eyepiece holder.
The ERF ( Energy Rejection Filter ) as the name suggests, limits the amount of radiation energy entering the telescope before the Etalon and Blocking Filter further reduce the energy of the Ha end of the spectrum down to 1uM.
At least I hope the description is accurate, other more knowledgeable forum members feel free to add anything that I may have gotten wrong in the description .
|