TV Plossls/Powermates: Poor Man's EP Set?Posted By Mike Ratcliff |
I thought of getting 3 TV plossls (32mm, 25mm, and 20mm) plus the 2.5x and 5x TV Powermates and using this setup exclusively as a "poor man's" set. Has anyone else done anything like this?
Got to thinking about this after reading R. F. Royce's website (premier mirror maker) where he said he only used a few plossls and barlows.
For a common 1200mm focal length (10" f/5, 8" f/6, 6" f/8) this would give 38x, 48x, 60x, 94x, 120x, 150x, 188x, 240x, 300x.
Advantages:
Optical excellence, comfortable eye relief (12.5mm UO ortho bothered me even though I don't wear glasses), good magnification coverage, much cheaper than say 5 Naglers.
Disadvantages: 50 degree field of view, awkward swapping of equipment
I look at both planets and DSO's. Undriven dob.
Any thoughts?
Mike Ratcliff
Got to thinking about this after reading R. F. Royce's website (premier mirror maker) where he said he only used a few plossls and barlows.
For a common 1200mm focal length (10" f/5, 8" f/6, 6" f/8) this would give 38x, 48x, 60x, 94x, 120x, 150x, 188x, 240x, 300x.
Advantages:
Optical excellence, comfortable eye relief (12.5mm UO ortho bothered me even though I don't wear glasses), good magnification coverage, much cheaper than say 5 Naglers.
Disadvantages: 50 degree field of view, awkward swapping of equipment
I look at both planets and DSO's. Undriven dob.
Any thoughts?
Mike Ratcliff