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About Macavity

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    Main Sequence
  1. P.P.S. A random suggestion, I decided that the (splendid!) Evoguide was a bit heavy to mount on TOP of smaller scopes. I made a (cheap!) "multicope bar" from 6mm Ali - Now mount my finders "alongside"... OK, on an EQ mount, but any lowering of centre of gravity helps.
  2. Can you not find / use a UK supplier... most carry Tube Rings. <-- Checks for hisself... Aside: I do now see what you mean re. Delivery times though. Good luck with it! P.S. Pity uz poor MAK150 owners. There's a challenge - Finding rings to fit. Eventually had to remove the "fuzzy felt" and was thankful for having an original "Gold" one. Thinner paint!!!
  3. Nice *sharp* detail on those spot "bridges"!
  4. "A little boy in a dream just the other day... His mind fell out of his face and the wind blew it away". They called him "Astro Man"?!? lol @ Jimi Hendix! I admit I have been known to EDIT a post after someone has commented. Sometimes, just to clarify the original idea? But I *do* take CARE that the general meaning is not changed. But then, I see this as a leisure / hobbies forum... NOT a court of law? Stupid or not, I still give people the benefit of the doubt? And if these folks stimulate *some* (ANY!) interest in science...
  5. I always feel I'd be interested to know how they propose the "sperm" is transported from space to ground (zero) without being "fried". The other half of the hypothesis? I found the video entertaining / meritorius etc. - Ultimately "innocuous enough" etc.
  6. Perhaps intended for another thread? But anyway... Adjusted the levels of Vlaiv's original image to give pseudo(!) short, medium, long exposure inages. And here's the masking result: Clearly (presumably!) it would work rather better with REAL short/medium/long exposures!
  7. No, not factorial 110 (maybe). lol, But some interesting ideas: https://www.universetoday.com/146721/the-bare-minimum-number-of-martian-settlers-110/ Perhaps linked to that (inbuilt human) Number (around 100) re. the size of the medieval village... maximum "people you [can] know" fairly well? (i.e. Not Facebook Friends!)? Maybe even "Big Science" collaborations? Not sure how *anyone* could "know" N-thousand scientists/engineers/technicians/programmers/etc. these days?!?
  8. Too kind Vlaiv! No "rocket science" on my part. The technique intruigued! GIMP is rather different to e.g. Photoshop. But the link to the macro is: http://tir.astro.utoledo.edu/jdsmith/code/exposure_blend.php I think I have even got it to work by using a *single* exposure by adjusting the brightness/contrast to give three frames! Maybe if you have sufficient bits to play with... Though I very much doubt that is "notably scientific"! lol M42 does seem to be a good candidate to try this though? I should probably have a go myself of course. But maybe with better data.
  9. When I started out in Astronomy, I was intrigued by the idea of... "The Trapezium" (In Orion)! I couldn't see it "properly" with Dad's binoculars and the images in books left me none the wiser. lol Of course, eventually, I had a telescope that DID reveal it! But then I wondered if I could show (via Video Astronomy) the "Trapezium in context". I found that I could - with three short/med/long exposures and combining them via masking: Of course 8-bits / large pixels rarely SHINES re. Nebulae! (Aside: I used an automatic masking GIMP macro too. lol) If there any GREAT imagers out there, who "do requests": I'd love to see your 32-bit colour versions of the above...
  10. Another from my Firefox "Pocket". Who knew... Londoners? Interesting Astro stuff re. Robert Hooke's "parallax scope"! https://www.bbc.com/future/article/20170810-the-medieval-lab-hidden-inside-a-famous-monument
  11. They are NOT the easiest thing to use! A couple of random thoughts. (Before you give up and look for better ways? See Carole above etc!) I echo ABOVE re. focussing. The multi-turn focus may be a long way out. I suggest you might "hang on(!!!)" to the setup -- try to (carefully!) "tilt" it to a bright object - During *DAYLIGHT*: TV aerials... Church Spires(?)... You can then be sure you have things at "infinity" in focus... For an initial (quite good) "latitude" mount setting, I use a Digital Level: (Available from "good stores"... Ebay -- "Hundreds of other uses" etc. I Just lay inside the Saddle - adjust the inclination to 5n.m whatever deg! I also draw a chalk (whatever) a "North-South" on the "patio" (whatever) using the Sun's Shadow at local solar noon! Rotate the setup to match. I can now be sure I have the mount "pretty well" aligned, before I try to look throught the polar scope! I THEN found I could see stars through the polar scope, but I couldn't see the graticule easily! I made a DIY LED illuminator... It worked! I could align the mount. But I still "gave up". lol! But I would STILL commend the above way to set the scope up (nearly)! (It might be all you need, until you can/do explore the better methods...)
  12. As a general thought: Max. possible magnification depends on seeing. (As you may know) this will be (for a MAK127): 1500 / e.p. focal length) All units in millimetres! Good to have a SET of "planetary" eyepieces... As (one!) rule of thumb: 200x may be typical max. for UK skies/scopes? Of a 5, 7, 8mm choice, I would suggest go for the "lower" (8mm) power (already 20xx) FIRST and see how it works for YOU / your location etc. For the lowest power re. MAK127s, a 32mm (50 deg!) Plossl type is a "safe bet" re. the so-called "vignetting" of the scope. Or a 25mm 70 Deg e.p. for the same visual field at slightly higher power. f/12 MAKs are forgiving re. e.p. price/quality, so reasonably priced ones should all be... "reasonable"! See ALL above posts? Too SLOW at the typing/thinking thing these days.
  13. Unfortunately, these can be quite LARGE topics... But don't be discouraged... Wikipedia shows the general effect of Chromatic Aberration (false colour) re. budget Camera Lenses. The general idea holds for refracting telescopes too. https://en.wikipedia.org/wiki/Chromatic_aberration The above is clearly a "worst case example" to illustrate the idea! A typical (modest... reputable) Achromatic scope will show *some* of these issues. A better (more expensive) ED refractor etc. will show much less of these... Of course, I did forget about the "aperture is king" Dobsonian Reflectors! It is a GOOD point. For some reason I was "not attacted" by Dobsonians. But reflecting telescope show no false colour... but do need collimation etc. This is a big forum! But this sort of information can be found via a search! (Once you find some information on ONE term... checkout other (links)??? Video Astronomy is an exciting (and substantial) topic in itself. Things have evolved quite a bit since "my day" - Albeit but few years ago. lol. Video data can be "stacked" both in real time and via offline software! But if you are excited by this (Perhaps after a bit of visual observation): https://stargazerslounge.com/forum/208-eeva-electronically-enhanced-visual-astronomy/ Opinions differ... There are many solutions / personal preferences! These were just mine. Good to read... "mull over"... a variety of post(er)s!
  14. Learned a lot from BOTH "first" scopes: ST102 f/5 achromat and SW MAK90... Always aware of likely virtues / limitations, I'd still go for both one or t'other. The ST102 came with the (slightly awkward!) AZ3-2... But I do still have/use it! Mounts: Again a useful learning tool, but I didn't "get on" with small GoTo's. (A decent mount - tho' more expensive, will "last forever"... HEQ5, Sky Tee...) Beware the "eyepiece tango"? A lot of time/money can be spent on that one! I rarely do/did visual, but (again, within limitation re.. faster scopes) I still LIKE (still have) three of my old Baader Hyperions: 10mm, 17mm & 31mm Asph. Aside: My "epithany" came with (independent) discovery of Video Astronomy. Occasional flirting with Classical Imaging? But that's a rather long/er story... P.S. I learn a lot from Books... the Internet. (I know how to find references! lol) Others learn from "Forums"... (onetime!) Astro Soc. "Beginners' Evenings" etc. Whatever! I think it a good thing to "know your stuff" when... before starting.
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