Andy Resnick's latest activity
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Andy Resnick reacted to Astronuc's post in the thread Minor phreatomagmatic eruption, Taal Volcano, Philippines, July 17 with
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Minor phreatomagmatic eruption occurs at Taal Volcano on July 17 What happens when lake water meets magma... -
Andy Resnick replied to the thread Most Hard-Driving Music?.Not my favorite band (although I did enjoy "The Dirt"), but this tune straight-up kicks a$$:
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Andy Resnick replied to the thread B Simple mass/scale puzzle.Have you tried drawing some? You said your learning is a bit rusty, this seems like a good 'homework assignment' :) Edit: when you do...
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Andy Resnick replied to the thread Random Photos.Hey, that's spiffy! Thanks for the heads-up. Your raindrop photos are excellent, btw. I have a Gitzo tripod, no center column. One...
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Andy Resnick replied to the thread B Simple mass/scale puzzle.How about this explanation: cut one of the strings (no glue, no anchoring, just cut the string) so the scale reads 0 N and accelerates...
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Andy Resnick replied to the thread A When should I analyze optical problems using ray tracing vs. wavefront analysis?.Thanks, that's helpful. I guess I don't understand why you think ray tracing does not give valid results; ray tracing through GRIN...
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Andy Resnick replied to the thread A When should I analyze optical problems using ray tracing vs. wavefront analysis?.Thanks, but the diagram you provided isn't helpful. For all I can tell, you just made that up using your imagination. Where is the...
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Andy Resnick replied to the thread Music Talent Worthy of Wider Recognition.Descartes a Kant: https://www.youtube.com/@Descartesakant/videos "A Night at the Theater" episodes are pretty cool, I really like the...
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Andy Resnick replied to the thread A When should I analyze optical problems using ray tracing vs. wavefront analysis?.The branch of optics characterized by the neglect of wavelength (the limiting case of λ→ 0) is geometrical optics, which models the...
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Andy Resnick replied to the thread Our Beautiful Universe - Photos and Videos.M57 and surroundings: Deets: Nikon D810 + Nikkor 800/5.6 @ f/8, 8 s subs, 21 h total integration time. Stacking and post-processing...
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Andy Resnick replied to the thread The Secrets of Prof. Verschure's Rosetta Stones.Fenite. Type locality: Fen Complex, Telemark, Norway. Fenitization-1 minerals comprise 51% of the total rock volume of this sample...
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Andy Resnick replied to the thread The Secrets of Prof. Verschure's Rosetta Stones.Continuing with examples showing increasing levels of fenitization: Fenite. Type locality: Fen Complex, Telemark, Norway. This sample...
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Andy Resnick replied to the thread Our Beautiful Universe - Photos and Videos.Could be! Here's an image I took a while ago, my 15mm lens on a regular-ol' tripod, 30s exposure: M31 is the smudge in the lower...
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Andy Resnick replied to the thread The Secrets of Prof. Verschure's Rosetta Stones.Another fenite: Fenite. Type locality: Fen Complex, Telemark, Norway. This sample was been classified as having moderate...
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Andy Resnick replied to the thread Our Beautiful Universe - Photos and Videos.If I am understanding you, what you really need is a motorized mount, not necessarily a longer focal length lens. In order to use...
