John Posted November 15, 2010 Share Posted November 15, 2010 This is a daft question which I probably ought to know the answer to but what is the orientation of the image in a PST ? - is it refractor-like or newtonian-like or as we see things ?Thanks Link to comment Share on other sites More sharing options...
Peter Drew Posted November 15, 2010 Share Posted November 15, 2010 Hello John.The PST is refractor astro orientation. The pentaprism maintains the original astro orientation despite the 90 degree deflection. Link to comment Share on other sites More sharing options...
John Posted November 15, 2010 Author Share Posted November 15, 2010 Hello John.The PST is refractor astro orientation. The pentaprism maintains the original astro orientation despite the 90 degree deflection.Thanks Peter I'm glad I asked now as I might have guessed at a refractor / diagonal view with N at the top and E / W reversed. It's not as if you can look at anything else with the PST to see what way up it is !. Link to comment Share on other sites More sharing options...
Peter Drew Posted November 15, 2010 Share Posted November 15, 2010 You can view terrestrial objects silhouetted against a setting Sun. . Link to comment Share on other sites More sharing options...
brianb Posted November 15, 2010 Share Posted November 15, 2010 It's not as if you can look at anything else with the PST to see what way up it is !. No but you can observe the sun drifting through the field on an undriven mount (or a driven mount with the drive turned off): in the morning a "naked eye" / "binocular" view will drift to the right and up, in the afternoon to the right and down. If the drift is to the left the view is horizontally reversed; if the up/down drift is reversed the view is vertically reversed. "Simples!" Link to comment Share on other sites More sharing options...
John Posted November 15, 2010 Author Share Posted November 15, 2010 No but you can observe the sun drifting through the field on an undriven mount (or a driven mount with the drive turned off): in the morning a "naked eye" / "binocular" view will drift to the right and up, in the afternoon to the right and down. If the drift is to the left the view is horizontally reversed; if the up/down drift is reversed the view is vertically reversed. "Simples!"Thanks Brian - I should have thought of that Link to comment Share on other sites More sharing options...
russ Posted November 15, 2010 Share Posted November 15, 2010 Thanks Brian - I should have thought of that Don't worry John, i hadn't thought of it either Link to comment Share on other sites More sharing options...
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