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  1. Heheh - I haven't! But it is theoretically possible? You'd have to work out light levels (obviously) - Each *DS* CaK equivalent to an ND2 filter (If I remember?). The superposition of gaussians should give you a (calculable!) improvement... Aside: Even saw "peak minus wings" subtractions with "nearby" near-UV filter! (All very "Particle Physics", I thought! lol.) The only prob I had with my DS CaK was inter-filter ghosting reflections - Notably with mirror scopes (MAK 150). I [too] sense that once-planned REAL CaK scope receding into the distance.
  2. Outside of the revolutionary discoveries, the LHC produces a whole lot of interesting Physics re. the Quark model etc. Often with surprising results and tantalising hints at departures from "Standard" Models etc. etc. https://theconversation.com/cern-scientists-discover-four-new-particles-heres-why-they-matter-155800 Good review article with lots of suggestions for additional reading!
  3. Space ART often depicts Towering (Psychedelic!) Cumulo-Nimbus on Jupiter. But even recent Juno images seem to look more like Earth's Ocean currents? Way back in 2004(!) someone else thought THAT too. (Hope link still works): https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2004GL019691 I sense there are possibilities for (Bob Ross') "Happy little clouds" (lol), but these are probably the small white "blobs" on top of the Jupiter "oceans"? There are clearly many factors influencing this tho: SCALE, Temp, Viscosity... A flurry of papers in 2004? Not sure what the LAT
  4. One cloudly night, at our local Astro Soc, we tried a new quiz: Guess the object from the (typical) Book description! It is not quite as "impossible" as you might think? (No pics needed). Or maybe it just we oldies were brought up on the same (few) Astronomy Books... Or just it's cloudy, rather a lot, locally?!?
  5. In theory (IIRC!) the "Sweet spot" size goes as the CUBE of f-number. So an f/5 scope is about "twice as easy" to collimate as an f/4 one. You will have to check, but we are talking a couple of [mm] for f/4. I reckoned the different "slop" between camera / collimator in the focusser etc. must approach those sort of levels, so, "best efforts"?
  6. I suppose, for me, the big question is... whether the [IMO] remarkable fusion of disparate components into Eukaryotic (Thanks B.Cox) life, is found elsewhere. Recently read an interesting article where scientists claim to identify Ancient Pandemics via Viral DNA fragments common to ALL (surviving?) life on earth! We may even be slightly/mostly Virus? Just the irony of it: "Viruses are us"?!?
  7. I usually operate my scopes remotely via 30m USB link. But THAT is still the "stuff on nightmares" - No schadefreude, but I did buy a few budget Low-light MINI security cameras and switchable "IR" lamp for the obsy. A coax multiplexer allows me to see my (Video Astronomy) Scope view, Finder View, All-Sky View and Observatory view. I still "worry" of course! The bottom right shows the scope & mount BRIGHTLY illuminated by IR! But there is usually enough "ambient light" around to see outlines of stuff... Neighbours' security, street + bedroom lights? But that's another st
  8. I *think* the idea is to THINK about performance (your experience) of scopes in areas you try them out. My first ever scopes were a MAK90 and an ST102... Deliberately "chalk and cheese"? Taught me a lot? Form your own opinion? Despite "Swearers by" certain scope types, their is also some commonality. Quality, aperture and focal length seem to matter as much as scope type?
  9. I guess it depends on how DEEPLY you want to clean the Mirror... If it's only a matter of removing odd "insect Poos", clean it in situ? Avoid dissolving/dragging mounting bracket material onto mirror...
  10. Reminded of onetime plot of evolution of the measured speed of light - Appeared among "constants" in the Particle Data Book. But no more. (Some things are fixed... defined... whatever, now.) https://pdg.lbl.gov/ (Repost -- Obligatory bedtime reading?) But the accepted values can tell an interesting story? The measurement precision gets better with time (usually), but sometimes dramatic STEPS occur too! Not the speed of light, but the mass of the omega meson: Different experiments, different techniques, different assumptions... etc. Sometimes a bit of "psychology" at
  11. A little off-beat... For "misc. Use", I decided to standardise on TS filter slides (rather than filter wheels) https://www.teleskop-express.de/shop/product_info.php/info/p10475_TS-Optics-M48-Filter-Changer---strengthened-Design.htm Made myself a DIY holder out of thin plywood / square dowel and threaded rod. The whole fits inside a plastic box... can be expanded if you buy more filters etc. Since my sawing skills were limited, I assembled the above and ground all the edges flat with a horizontal sanding disk! (I even varnished the result). The idea can be used to store/mount
  12. Needs another (unopened?!?!) one for "scaling purposes"! But I sense now they (probably) wrap the whole 400g TIN?
  13. Hi Ron! Thanks for past kind / encouraging remarks. So, essentially, back at ya? "Keep on... keeping on"!
  14. Thinking about particles in orbits I was reminded of (LHC) beams in accelerators etc. "Stochastic cooling"! But a search on "Saturn Rings + Stochastic" DOES yield results. (N.B. analogies don't always work... Except perhaps in Alchemy? lol)
  15. Re. "More unusual" object selection, I did find the (Steve) O'Meara visual guides useful. Selected from several "lists" and (imo) has "nice logical" approach - Albeit originally re. Visual Observation. Anyway, it's over 400 objects (four volumes) to be going on with.
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