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  1. Ravi

    Shape-Changing Light From Plane with Nikon P900 - Polarizing filter + Venus?

    I looked up the optical design, perhaps of interest. Looks to me like a complex design (5 moving groups), and perhaps could be vulnerable to small mis-alignments? Perhaps that can cause the aberrations? Hmmm.. not sure though.. source...
  2. Ravi

    Need help: Apollo Cold Welding Mitigation

    Ah, esmat. :) A problem is not a problem if there are ways to prevent it.
  3. Ravi

    Shape-Changing Light From Plane with Nikon P900 - Polarizing filter + Venus?

    Looking at the video Mick has linked in post #1, (Source: https://www.youtube.com/watch?v=IF3w0kI53aU) When you see the transformation going on of the blob @ 6:46, I can only conclude it is caused by optics. Can be the window (quite dirty!) or the camera itself, but for sure it is caused by...
  4. Ravi

    Strange line up of lights in the sky of Verano, Italy. [Internal reflections]

    It is mirrored in the centre of the image (optical centre), thus it is flipped in both X and Y. Any light source not seen by the camera/observer cannot show a reflection in the image, as it happens inside the lens. What it can create is stray light or ghosting (light enters the lens/objective...
  5. Ravi

    Strange line up of lights in the sky of Verano, Italy. [Internal reflections]

    Ok, fair enough. I guess I frequent reddit too much. ;)
  6. Ravi

    Strange line up of lights in the sky of Verano, Italy. [Internal reflections]

    I always get a bit suspicious when i see a photo posted that has been cropped (for no good reasons)... Like to hide something.. But hey, that's just me.
  7. Ravi

    Need help debunking FE video

    I had the exact same reaction. Looks much higher. But also I don't have calibrated eyes.
  8. Ravi

    Shape-Changing Light From Plane with Nikon P900 - Polarizing filter + Venus?

    100% astigmatism ie distortion of the wavefront. The more point-like the source, the flatter the wavefront, and thus the most easy to get influenced by non perfect refractive elements. The window is the culprit imo.
  9. Ravi

    Explained: UFOs viewed from the ISS - Squid Boats

    The static pixels are noise/hot pixels. The grouped lights are very likely squid boats. I had a tough time convincing folks on Reddit that the camera was NOT looking at space, but at Earth. "But why do we see stars then?".. Sigh..
  10. Ravi

    Nimitz Tic-Tac Fravor/Dietrich Encounter - Missile Hypothesis

    Is that launch from semi-underwater? Or is the sub fully floating. Must be bloody loud!
  11. Ravi

    White Flying Object Over US Navy base in Japan (July 2021)

    I think it is a drone. Lots of folks like to film lightning or thunderclouds with their flying toy.
  12. Ravi

    Pentagon June 2021 Report on 120+ UAP Incidents

    Do we get a centrefold with a naked female alien? :cool:
  13. Ravi

    COVID-19 Coronavirus current events

    I hope dearly you are correct, but I don't think the "next time" we will go to the cupboard and take out the file called "lessons learnt from COVID19". Perhaps some countries or communities will, but definitely not all of the world (not implying you mean that).
  14. Ravi

    NYT: GIMBAL Video of U.S. Navy Jet Encounter with Unknown Object

    Still, no aberration should be visible. If there is one thing that optical engineers hate, it is aberrations. So, you can count on it that the ATFLIR is designed properly. If there is any aberration left in there, it is smaller than the camera can resolve. Also, the telescope (TMA) is not the...
  15. Ravi

    COVID-19 Coronavirus current events

    Reminds me of this scene.. :D Source: https://www.youtube.com/watch?v=wV_BPDi8Ems
  16. Ravi

    NYT: GIMBAL Video of U.S. Navy Jet Encounter with Unknown Object

    The system used in the ATFLIR pod is a TMA. I explained why it is called an anastigmat, namely it has per definition NO aberrations.. You claim "because it is off axis, therefore we see aberrations", this is false.
  17. Ravi

    COVID-19 Coronavirus current events

    I see your point @deirdre, and thanks for the heads up. I meant to say that it looks like we are going to move in a future where we cannot have normal (ok, old?) human interactions anymore, like kissing, touching or having plain fun. I foresee that this is going to happen. It is already seen...
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