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  2. We haven't been able to obtain info other than what is printed in their catalogue. To be fair to Synta/Sky-Watcher, if the mount is still in development then their reluctance to release info is understandable. It certainly does feel that way Steve
  3. I wish they'd bring out a reducer for the Esprit range. I know there are other options but they look tricky to get right.
  4. Alan Re-reading your post, should I still have a link from DC- on the relay board to one of the GRD connections on the VM110? Thanks Peter
  5. That CQ350 looks interesting. Got any detailed specs? Looks like it's a spring loaded worm now? I think the gap will prove to provide a way to do through the mount cabling easier. The mount market is heating up it seems.
  6. Hugh and Alan Many thanks for the fault finding in the circuit so quickly. Below I have redrawn, using my overly-complex layout as I have it on the computer as an image. I've drawn in a connection from the battery 12V- to DC- on the Relay Board. I've removed the DC- on the Relay Board to GND on the VM110 and also the 560 ohm resistor. I've changed the wiring for the NO and NC on relays one and two, in compliance with Hugh's board, putting them on the opposite side of the diode from where I had them placed before. I also reversed the battery symbol. I drew in but then removed an extra connection from the 7ah battery 12V- to NO1 and NC2 as they seem already to be connected to 12V-. Are those the GND connections that you think I need or are we talking about a separate ground line, e.g. to the metal plate that forms the housing of the Pulsar/Rigel system? If so should the GND on the VM110 also be connected to that point? For the moment I've left in the double pole switch to the 7Ah battery because otherwise there would seem not to be any 'off' position. In my diagrams I've shown the 12V charging socket which needs to remain live for the solar panel to maintenance charge the 7Ah battery. Would it not be better to isolate the two rotation circuits when not in use with a switch? Concerning the Raspberry Pi to VM110 connection, that is via a USB to USB micro cable. Not sure how I check grounding of that, that USB micro socket is the normal power in to the Raspberry Pi and I've not spotted any other GRD connection point on it. Thanks, Peter
  7. Actually, I got the Bortle scale wrong- I should have written 5/6!
  8. laudropb


    Hello and a warm welcome to the SGL.
  9. I would watch the weight carefully. I have a 15" truss Dob that is all oak with a full thickness Nova mirror that is very good indeed. However, the mirror box is 65 pounds which is just a bit too much for my back to deal with most of the time. I'm thinking about getting a 12" or 14" aluminum truss Dob with a tapered mirror to cut down on weight so I'll use it more often. If I had a dry place outdoors to store the 15" assembled, I could add wheelbarrow handles to it to wheel it out. Perhaps if I get a place in New Mexico when I retire, that might be an option. I don't know about Australia, but used premium Dobs come up all the time on Astromart and Cloudy Nights classifieds for good prices. The mechanics and finish are also much better than on mass produced Dobs from the Far East. I've also never heard of issues with their integrated goto systems when so equipped.
  10. I agree SCT have the same strength when fitting cameras. Would also love to know if changing focus position alters the performance, I can get focus with the DSLR screwed directly onto the built in M42 threads or still have plenty of adjustment to get focus with an additional 2 inch extension tube. My gut feel is that it must be beneficial to have the main mirror as far back as possible so presenting the smallest light cone to the secondary but I could be completely wrong. Alan
  11. Interesting design difference between the CQ350 and the CEM60 (which I assume is in pretty much the same target market), with the former having a gap in the RA axis. I wonder why they chose that design? James
  12. Honestly don't believe a word it says. Have spent a good while trying to adjust tilt using cc'd inspector before giving up on it and getting a better result in minutes doing it by visual inspection.
  13. Pretty sure SCTs are in the same category. One thing I haven't been able to get a definitive answer on is whether or not extending focus further back on Maks adds spherical aberration to the image as it does with SCTs. Does anyone know if moving focus far off of the design focus point for Maks adds aberrations to the image?
  14. Ok, yes, indeed as mathematical concept we can have something like bounded set with infinite number of elements. This is fairly simple to see - let's take simple case of set of real numbers between 0 and 1. This set is bounded - there is upper limit and lower limit and there is a number which is greater than distance between any two set members - like 2, if we define distance to be difference of two numbers. We can "apply" such a model to hypothetical universe, but we can easily see that such universe is "unphysical" - density is infinite, all "elements of reality" have only one property - value and there is infinite number of elements of reality that are in principle - "unknowable". Spatial extent of any element is infinitesimally small - or 0, and by "unknowable" I mean that there is a bunch of numbers - irrational numbers that can't be specified - one would need infinite amount of information to exactly specify them (infinite number of digits to be written down - which can only be done in infinite amount of time). This is interesting game to play actually - we can observe another set of numbers that has similar premise but different properties - let's take only rational numbers in range of 0 to 1. This set is also bounded, there are infinite number of elements, there is no lower limit on how "close" two numbers can be, density is infinite, however this sort of set is "sparse". We know this by virtue that on real line between 0 and 1 we have real numbers. Now if we split real numbers into two subsets - rational and irrational and remove irrational numbers - there must be some sort of "hole" left in that place and there is some sparseness in the set - and yet again - density is infinite and set elements are infinitesimally close Mind bending stuff really
  15. I remember you saying you were a Terry Pratchett fan. The journey will seem shorter if you're laughing a lot. Let's hope fellow travellers have a sense of humour.
  16. Today
  17. Impressive solar halo on show right now in W. Yorkshire.
  18. The new Sky-Watcher 2020 catalogue is out and contains details of some interesting new products RA Motor Drive for Starquest & AZ-EQ Avant (20952) This will please owners of Sky-Watcher Avant telescopes. (ETA 3-4 months). Rotational Adapter for Evostar 72ED (20500) The Sky-Watcher Evostar 72ED is a bestseller so it is good to see a rotator is in the pipeline. (ETA 2-3 months). Sky-Watcher CQ350 Pro Mount (20309/20293) A centre-balanced equatorial mount from Sky-Watcher. We weren't expecting that. (Still in development so we don't have details or an ETA). Sky-Watcher Synscan Starwand (20990) This one looks fun... (ETA not available)
  19. Don't think I can carry on with this. Going to have to take apart and try and sort it.
  20. Floater


    Welcome. I have no experience of such a scope but if you have any specific questions, just ask. Have fun on the learning curve.
  21. Printed the crutch and tried to assemble it all but found the anchor wouldn't fit so redesigned it and just finished printing it.
  22. I accept that vlaiv . But could not my infinite universe with infinite "stuff" not refer to the infinite number line I have used as my measuring stick. The infinite stuff therein being the numbers. Is it possible for any infinite system to have an infinite value of one property while not another? And what if the mathematical model links those two variables, if one is infinite what doe that imply of the other? I honestly have no idea. Jim
  23. My first scope, which was a gift, was a Celestron 76mm F/9 Reflector. You can see identical-looking scopes under a dozen brand names. They come on a wobbly fork mount atop a lightweight, bouncy tripod. I wouldn't recommend this setup. The main challenge at higher powers is keeping a target in view long enough for the vibrations to stop. The kit did it's job in my case though. Once I'd observed the Moon, the Pleiades & Jupiter I was hooked on the hobby ! I soon acquired a 200p F/5 and I haven't looked through the Celestron since. But I wondered how the little Newt might perform on a better mount. I retrieved it from the loft , made a pair of tube rings & mounting plate from some scrap timber and bolted the scope to my EQ3-2 diy GoTo. With just a 3 inch aperture and city light pollution, double stars were the obvious targets. ( 21st May, from 11pm BST ) Zeta2 Corona Borealis, 6.5", a pair of white stars, like headlights in the distance, split at x70 but better at x140 (10mm Plossl & SW 2x deluxe Barlow.) Nu1 CoBo, 355", a wide, matching 5th Mag orange pair of cat's eyes in a 32mm Plossl (x22) with an unrelated third yellowish 7th Mag neighbour, forming a sharp triangle. Sigma CoBo, 7.2", a 5th & 6th Mag yellow pair split at x70 Xi Bootis, 5.3", yellow primary with faint white secondary to the NW, good at x140 Pi1 Boo, 5.5", a blue/yellow dumbbell at x70, clear split at x140 Izar(Epsilon Boo), 2.9", with the magnitude difference this was more of a challenge for the little scope but the secondary was visible as a lump on the first diffraction ring to the N of the primary at x140. The secondary looks grey to my eye in the 200p but here any colour was lost in the primary's orange glare. STF 1639 (Coma), 1.9, couldn't split this one, too tight for this scope I think. And to finish what else but the Double Double (Epsilon Lyr), 2.2", always fascinating & clearly split at x140 with a satisfying black line between each pair. The little F/9 reflector produced smaller, tighter stars which seemed more stable in poor seeing compared to the 200p, with fainter diffraction spikes. Great fun ! So once you seperate the OTA from the awful accessories that it comes with & put it on a steady mount the 76mm Newt is a handy little grab & go scope. I'm glad I rescued it from the spiders.
  24. Have you ever asked @Yoddha ivo for help on APT forum with regards to getting blind to work , he is very helpful at resolving issues you may have http://aptforum.com/phpbb/viewforum.php?f=24&sid=4fe9aba1b0f71cba44ac731f5957b766
  25. The complete works of Terry Pratchett should work (I have read them all, but they are always worth a reread)
  26. And just over a year to wait too Michael. Don't forget to take reading matter to last for the 7 month trip. Enjoy the sights on the way . Ron.
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