Merlin66
14-06-2008, 02:09 PM
Having finished the El Cheapo PST conversion, I'm already looking at ways and means of making further improvements...
By using a couple of 50/50 beamsplitters I can return the optical axis of the 90mm objective back along the top of the tube, position a 2" barlow as a collimating lens and direct the beam into the double stacked SM40/ PST.
This should give a 90mm scope with a resolution of 0.5A, a neat piece of gear!!
By reducing the amount of heat and light getting though to 25%, it's the equivalent of a 40mm objective, and maybe the ERF is not required!!!
This would make it a very cheap but effective solution.
Photo's to follow.
By using a couple of 50/50 beamsplitters I can return the optical axis of the 90mm objective back along the top of the tube, position a 2" barlow as a collimating lens and direct the beam into the double stacked SM40/ PST.
This should give a 90mm scope with a resolution of 0.5A, a neat piece of gear!!
By reducing the amount of heat and light getting though to 25%, it's the equivalent of a 40mm objective, and maybe the ERF is not required!!!
This would make it a very cheap but effective solution.
Photo's to follow.