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Jim Fly - Manufacturer
Quote:... But for the -8 degrees case, reflection 2 is at around 6*FAE (check the intersection of the final cone axis (leading to the pupil)and the horizontal line crossing P)
Quote: I count 5*FAE - but to your point, still larger than 4*FAE at half the FAE error. We are on the same page here.
Quote:I'd still like to know how you are arriving at the take-off angle of the rays from "P" to insure that the 5th reflection for image "2" accurately & precisely returns to the AC pupil in the illustrations. This most assuredly has to be an iterative process (Excel Solver).
Quote:Here's an interesting render allowing 8 reflections instead of 7. This PovRay scenario puts a partly cloudy sky above the AC at infinity. As the render shows, the large (30" diameter) AC background is a focused image of the sky above. This confirms that the dark background seen in the AC is actually the inside of the eye as has been surmised by Nils.
Note: AC is at 1 degree tilt FAE only.
400mm f/4.46 self made Dobsonian on Tom Osypowski equatorial platform Skywatcher 130mm f/5 BlackLine (finder, widefield scope and solar continuum scope) Sumerian 250mm f/4.8 Alkaid (as travelscope without platform and on Tom O. platform above).
One question, though: how are you going to find that perfectly transparent customer for your tools, or are you trying to corner the market for infinitesimal observers (much smaller than the AC pupil) ?
Quote:Wow!!!This is not what I expected. I need to stare at your renders for a day or two to make sense out of them.But one thing strikes me as odd is the 100 reflections render. Where is the white background coming from? Based on your model, I only expect to see mostly brown (ground), blue (sky), and black (darkness). Black color represents darkness or the lack of light but what does white represent? That is, which source is emanating the white light background in your model (it is not the clouds for sure)? Odd...
Quote:I have few questions about your model:1- Are you modeling the AC mirror with a thickness? If yes, what thickness are you using?2- I believe you mentioned in an earlier post, you are modeling a 30â€ AC, correct?3- What is the primary mirror size? What is the focal length?Jason
Quote:I ran Excel ray simulation and came up with the following at -8 and -4 degree AC tilts using ~0.6" pupil (I selected a large pupil for clarification). It shows why/how the sky FOV shrinks as AC tilt increases.Jason
Quote:Jim, having said all the above, I do not know where the dark and bright background come from? There is no eye pupil or Sun in your model.
At first glace it looks plausible but I'm thinking there's more to it than that - a smaller slice of infinity is still infinity
Quote:Quote:I ran Excel ray simulation and came up with the following at -8 and -4 degree AC tilts using ~0.6" pupil (I selected a large pupil for clarification). It shows why/how the sky FOV shrinks as AC tilt increases.
At first glace it looks plausible but I'm thinking there's more to it than that - a smaller slice of infinity is still infinity and the "sky sphere" in PovRay goes from horizon to horizon.
Quote:I ran Excel ray simulation and came up with the following at -8 and -4 degree AC tilts using ~0.6" pupil (I selected a large pupil for clarification). It shows why/how the sky FOV shrinks as AC tilt increases.
Quote:Very nice analyses, Jason! What about that "huge" faint distorted triangle on the right in the 100 reflection render?
Quote:Quote:Very nice analyses, Jason! What about that "huge" faint distorted triangle on the right in the 100 reflection render? No clue It appeared after more than 25 reflections â€“ many more reflections that my Excel spreadsheet and my brain can handleI am still unable to explain the whitish background gradual buildup. Obviously it has something to do with light leakage but I am unable to simulate it.My recent obsession with AC analysis and theories is driving me crazy. Now when I look into my bathroom mirror in the morning I keep searching for my â€œ1â€, â€œ2â€, and â€œ3â€ reflections. Jason
Quote:I commend you on your persistance to finally unravel the AC reflection mystery and your innovative use of the power of Excel. Consistent with your forte, you've done a masterful job with your illustrations; I would really like to see you now go back and condense all this revelation learning into a nice media-published article for the definitive summary record of your achivement. What do you think?