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ronin

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About ronin

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    Cambridge
  1. Signed up to an Astronomical Society

    Usually the idea is that although there is light pollution you still get out to meet others, chat, talk, compare equipment and even in the murke of the LP set up a scope or two and have a peer around. In the UK observing perfection is not going to happen, just grab and take what you can. Oddly the Cambridge club does not have any specific club observing and it is still a big club. Kind of shows that observing is not necessarily fundimental for an astro club. If they do any observing it is on the light polluted area of West Camb, which has just expanded to surround the location even more.
  2. binocular astrophotgraphy section

    What fundimentally would the difference be? Seems all you can do is attach a camera to one half of the binocular and get an image, either eye piece projection or prime image, as it is half it is in effect a single telescope. If objective size were a factor I have a 70mm scope that is smaller then many of the medium to big binoculars. 80mm objective binoculars are not uncommon and there is the WO Star 71 which is smaller.
  3. This could be of use, cannot see it given previously: http://www.astronomyclubs.co.uk/ It is always a good idea if possible to visit a club and see the equipment that people use and generally see it in the flesh. This is Mansfield and Sutton AS: http://sherwood-observatory.org.uk/ They adverfrtise an Open Evening for public on Oct 28, cost is £5 however.
  4. Geo Tagged Photos

    Just think of all the money the UK can save by closing MI5, MI6 and GCHQ down. All they will need to do soon is ask Google. Who will likely have more information on you/anyone and be able to get it quicker. And it all started as a half decent search engine. Think it could be time to resurrect my Canon T90 film camera.
  5. Could be simply that in transit to you the scope got a knock, not even a heavy one, and the mirror jumped and is no longer orthogonal (straight for want of a simpler description). I assume that the focuser still makes a difference to the view as that is the other "common" thing, the focuser gets wound out too far and the threads disengage and that also allows the mirror to move. Neither would be "serious", in a way as it is a case of remove mirror cell and reassemble with everything aligned right and attached, but each need it to be returned for rectification. A retailer will just put another in the post and at their own time look at the item from you.
  6. Will say that at outreach I have found that a dobsonian is not great, they are generally not something that a complete novice can aim at a point in the sky and see something. There is a learning curve with a dobsonian, and a 5 or 10 minutes introduction to one is insufficent. A small goto will be easy fo them to see things with, you need tracking more then anything to just keep whatever object selected in the field of view.
  7. One other aspect that is overlooked/ignored or whatever is that there is no reason to suppose that scope A and eyepiece B will be a compatible pairing. They may simply not work well together. When you throw in a barlow then the chances of all 3 being a good operating system together really drops. I would suspect that TV are about the only ones that have any degree of scope design related to barlow/powermate design related to eyepiece design. Most will produce an item in isolation to the rest of the optics, many have to I suppose and outcomes may be reasonable but not optimal. An eyepiece's performance in a way has to differ on scopes from f/5 to f/10. We just presume that all are equal.
  8. First off used is a good idea but if I said get an ABC scope then there is no guarantee that one will become available for sale. For ease I would suggest a refractor, the sort of reasonable one is the Skywatcher Evostar 90. Will say that the same scope is also apparently sold as Meade and Bresser and a few others. Check the retailers sites out and also check out the Bresser web site, if you can track down their "clearance" pages they could have a good deal. The other which I have is the Bresser 102/600. At f/6 it will show some CA, shouldn't really be a problem. ES do a similar sounding one that is 102/650. That is a seperated doublet, bit slower and more money. The Bresser ones comes with an assortment of bits that you will need to attach. The scope is delived in a sort of "imaging setup" to use for visual you need to add in one of the spacer rings - they supply 2 for some reason. So quite possible to sit there wondering which bits if any need to be added in. Big aspect is the budget and what it is that you want or envisage. As said used is fine if a used one appears - what if one doesn't? Add a location, as if US there is a reasonable ES option but it is not sold in UK/EU, bit of a shame as it reads like a good starter scope.
  9. Hot Shoe holder and a Red Dot Finder seems an often used set up. Don't think the Star Adventurer has a Dec motor so that makes goto not an option, as you cannot go down or up. Where are you, it helps to be able to point you at a supplier of items. As in I think 365Astro sell the bits but may not be applicable to your location.
  10. good beginner astrophotography camera

    For a dedicated camera then I suppose the ZWO ASI 178 is a good option, reasonabl size sensor, guess around the $500 mark but difficult to be sure. Bigger sensor is the ZWO ASI 1600, also bigger cost again guess around the $1000 area. Are you considering colour or mono ? Mono needs a filter wheel and filters and they like everything cost. Colour doesn't give as good a final result but they do not take as long to get the data/image as they collect everything in one go, hence the term OSC = One Shot Camera. Maybe a balance of the ASI 178 colour which is not as costly, but is colour however it will get you up, running and collecting images faster. Your scope is not the best for imaging, people use Mak's on planets not DSO and long exposure imaging. The Mak is generally too slow for DSO imaging. Also as mentioned you need an equitorial mount (with motors/goto).
  11. The speed of light is 299 792 458 m/s immaterial of your movement either towards or away from the source. Makes it easy in a way as whatever you do it is always 299 792 458 m/s. What makes it not so easy is that to account for any velocity by either yourself or the source the apparent wavelength is altered. If they think it may not be constant then there is the simple option that the velocity is just a bit different but again you still see it at velocity immaterial of your movement. So in effect swap 299 792 458 m/s for say 299 792 500 m/s. If the thinking is that the speed of light was faster in the early universe then oddly this could have a bearing on Dark Energy. The faster velocity could account for the observed increment in Red Shift of the distant objects that gave rise to DE.
  12. Seems to read that as the galaxies are formed along the drak matter filiments and nodes then they have managed to detect baryonic matter in the form of atoms and maybe dust along these filiments strands between the big lumpy galaxies. Which would kind of make sense. Still it is baryonic matter and not the "real" stuff of Dark Matter.
  13. Weird orange sun 16/10/17

    All afternoon we had yucky yellow sky/clouds. Very peculiar. Morning was normal - the usual grey type ones.
  14. LIGO-Virgo Detect Neutron Star Collision

    If I rercall from something and not 100% what, they detected they believe a Black Hole-Neutron star merger some time back. Problem was they were set up for BH-BH mergers and this one (gravity wave) didn't fit the models. So they kind of parked it to one side. Then they updated the system. Sounds like the improved system is therefore a lot better. Somewhere I had the reference for it and that was how I read about the detection. Suppose the question is therefore where did I get the reference. Think it occurred between the first BH-BH merger they detected that was a bit of a classic and the second. The second was 2 dis-similar masses and gave a less "classic" merger profile. In the middle was this "other" merger" that didn't really fit anything. With the number we are detecting they seem to be bumping into each other at regular intervals. So much for the "no 2 stars will ever collide" statements that abound. Seem more regular then supernova.
  15. Brandon eye pieces

    Brandons are simial to plossl's but they are sort of more optimisted for the centre of the field - bit ortho like. So good on planets, however that would imply the edges suffer a bit. Lots of arguements over them, and so it may be a little fortunate that they are somewhat rare over here. On CN the result is nearly always an arguement, and the same arguement. Usually the thread gets locked eventually. Think they came from the military background so had a slightly different requirements set from straight astronomy. Believe they are still made just unsure who by, however not a common item. In effect Al's plossl's took over as they were a more astro related eyepiece offering similar performance.
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