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Found 9 results

  1. Hi All, I have for sale the following: William Optics Binoviewer - £135. This is boxed and in excellent condition. SOLD. Telrad Finder - £22. This is boxed and in excellent condition although being used, it will need new sticky pads on the bottom. SOLD Baader Sky Surfer III - £15. This is also boxed and in excellent condition. SOLD. All items can be cash on collection or posted if the buyer pays postage. Also a heads up for future sales posts: most of the major items for a full PST mod, including PST, D-ERF filter, Coronado BF10, Vixen A80M, filter holder and finder. Also a MN190 + NEQ6. Pictures and prices to follow. Cheers, Jon
  2. Hello guys! Its me kronos, and i have been wondering about getting a binoviewer sometime in the near future! I do have some questions tho, (Binoviewer Budget Up to 200Euros *shipping and vat included) 1)Which One??( Please recommend sites from the EU only,Brexit is happening in a few days and i live in the EU so rip FLO for me) 2)Can i use my barlow lens on it(the lens part) i have a BST Barlow Or do i need to buy another one 3)Can i use 1.25" filters ? and if so, can i stack them with the barlow lens?
  3. SOLD! Admins - feel free to remove........Mint condition Williams Optics binoviwers with WO 20mm ep's and a pair of 25mm ep's. Comes as bought with WO barlow. Retails new for £284 so grab yourself a bargain and have them for £190 plus packaging. Get in touch if you fancy taking advantage of the rest of the season. Andy
  4. Dear all, yesterday evening, I set up my Celestron 5" MAK with Baader Maxbright Bino on the GoTo-Mount (Nexstar SLT) to have a look at our rocky companion in near space. First I just enjoyed the binocular view of the lunar surface: The trio Ptolemaeus, Alphonsus and Arzachel looked great but for sketching, the terminator had already gone a bit too far. The shadows were already pretty short, especially those of the large, flat crater Ptolemaeus. So I went north and was impressed by the wonderful view of eastrn Mare Imbrium. The famous triple Autolycus, Aristillus and Archimedes looked great and the mare ridges in the low lunar morning appeared very threedimensional. Further north the flat crater Cassini and the famous Vallis Alpes were prominent landmarks. But as usual I wasn't happy with just observing, so "Hhhmm, what should I sketch now?" The whole eastern arc of Mare Imbrium would have been a wonderul target but I didn't plan a longer session. I wanted to sketch just a single crater, so I picked the largest one in the area: Archimedes (which had been on my target list for some time already). Here's the result: Telescope: Celestron Nexstar 127 SLT Eyepieces & Accessories: 10mm "Super", Baader Maxbright Binoviewer, TS diagonal Date & Time: March 16th, 2016 / 2030-2110 CET Location: home terrace, Dusseldorf region, Germany Technique: chalk-, whitecoal- and charcoal pens on black sketching paper The flat, peakless interior reminded me of crater Plato but the volcanic material in Archimedes was a bit brighter. The shadow of the eastern crater rim covered almost half of the crater floor. The western rim shone bright in the sun. The hilly "peninsula" outside the southeastern crater rim and the northern parts of the Montes Archimedes looked pretty bright as well. The hilly area inbetween was showing a scattered mixture of brighter parts and dark shadowed areas. North of the crater, the western ridge of Sinus Lunicus was visible as dark ark in the low lunar morning sun. The small peak a the south of it produces a long triangular shadow. An hour later I had a peek on Jupiter with two moons and shadows on his clouds but the seeing wasn't good enough to see more than the GRF and Ganymede's shadow. Anyway, since Jupiter was not the main target of this evening, I wasn't too disappointed. Clear skies! Achim
  5. A review of a budget Binoviewer. As a preamble, binoviewers split the image so that it can be viewed by both eyes. These were originally invented for microscopes, where they are usually described as 'binocular viewers' or the like, and seem to be in common use. If you are good in the workshop it is possible to convert a microscope binocular viewer for astronomical use - the used microscope viewers tend to be cheaper. Why use a binoviewer? Essentially because two eyes are better than one. If you want to see what a binoviewer might do for you without investing a three-figure sum, try looking at this screen (or your HDTV) using just one eye, then the other one, then both together. Which is better? So why are they not universally used? (1) cost and complication. (2) Light loss. (3) Adds about 10cm to optical path length. BST Starguider appears to be a trading mark of "Sky's The Limit" who supplied this item at a cost of £120. They say that it is identical to the Arcturus binoviewer sold in the USA. The device and packaging however are not marked with any name or identifying marks. In general appearance it looks like other budget binoviewers (a lot of the budget binoviewer brands come from the same factory.) It comes with two 32mm Plossl eyepieces, a x1.8 Barlow and a x3 Barlow, which is more accessories than most of these outfits offer. The unit appears fairly well made and is packaged with sealing bags, and various plastic caps. The eye-spacing is controlled by a hingeing arrangement (like conventional binoculars) The eyepieces are gripped by compression rings and at least one can be individually focused. The eyepieces are claimed to have a FOV of 48 degrees with 22mm eye relief. They are unmarked and look budget, and I suspect that given the clear aperture of the binoviewer itself is more like 25mm, some vignetting must occur. I tried the binoviewer first in daylight, using my 127mm Mak on a AZ-4 mount. In summary, it does work, and gives a distinctly 3-D view of satellite dishes and the like. The aluminium nosepiece can be unscrewed and replaced by one of the Barlows. Getting focus in a Mak cassegrain telescope was no trouble at all, but the magnification seems higher than expected. Hopefully the Barlow lenses will allow focus to be attained in other designs of telescope. At night, on Mars and Venus, I could not get a clean image with my right eye without the Barlow lenses, but with x1.8 I could get a clean image with both eyes. The problem seemed to be with my eye, as I re-tried after rotating the binoviewer through 180 degrees. I compared the results with a regular 15mm Plossl and confirmed that the binoviewer results were acceptable considering the observing condtions. On the Moon there was a striking 3-D effect, and picking out fine detail seemed less of a strain when using both eyes. Castor (double) was well split with the x1.8 Last night I tried it on Jupiter with the x1.8. (magnification x100 - x120?) The seeing was awful, but I could make out two cloudbelts which seemed to have uneven edges. I have seen (glimpsed) more detail with regular eyepieces in previous seasons, but using both eyes seems less of a strain. I am still waiting for a 20mm Plossl eyepiece to make up a 20mm pair. I bought a second 20mm Revelation Astro Plossl and was able to try them on 14th March. I found that with these I had difficulty in merging the images. This is not a fault with the binoviewer; the 32mm eyepieces still work fine. One of the Revelations has a safety groove on the barrel while the other has not. It dawned on me that the 32mm Plossls supplied are specially designed to minimise the path length, as the entire barrel apart from the eyecup goes inside the eyepiece holder. Not so with the typical astro eyepiece! With some fiddling around I was able to get the images to merge, and found that the 20mm eyepieces work quite well on Jupiter. Some extra winding of the Mak focus knob is needed to get them in focus (it is easier to do this on a bright star or planet). On the Moon, the magnification seemed higher than nominal. With the x1.8 Barlow there was marked off-axis chromatic aberration, worse than with the 32mm eyepieces. In summary, binoviewing does work, and if you want to try it out with an entry-level device, this model, at half the price of some of the other popular binoviewers, seems worth buying.
  6. After a little good news (not often that happens right) I have managed to just order a William Optics binoviewer from FLO. Wanted one of these for a while, but was originally planning to get one next year, but managed to bring that forward now, so looking forward to some good views through them in my scopes. https://www.firstlightoptics.com/misc/william-optics-binoviewer.html
  7. I've read reports over the years that bino-viewers enhance the experience of solar system observing, so I finally decided to buy one. I didn't want to spend too much money, so I got the Celestron one for $175 on Amazon and since I already had one Celestron 8-24 EP, I bought a second one. I have an 8 SE scope. The seeing was below average tonight, but it wasn't cloudy so I pointed my scope at Jupiter, not expecting much. Wow--the detail in the cloud belts was amazing with both eyes. I switched back and forth between bino-viewing and mono and I'm a believer now in bino-viewing (at least for solar system and brighter deep sky). It looks a bit 3D too (as others have said). It is absolutely worth the money (to me). I look forward to viewing Mars, the Moon, and globular clusters later this week when I go camping.
  8. Hi does anyone know where to buy an exact adaptor to use the above binoviewers with baader quick changer? From what i understand they are all exactly the same. The reason i want this particular bino is becuase it does not have any polarization effect and has self centering eyepieces. My system is ver baader oriented so i would liketo maintain compatability.
  9. Revelation binoviewer for sale, complete with two pairs of eyepieces. In very good condition, complete with original aluminium box, a pair of FMC 12mm wide angle eyepieces and a pair of FMC 20mm wide angle eyepieces. New from Telescope House the binoviewer alone is £125. For both sets of eyepieces plus the viewer the price is a mere £120, plus postage. Postage will be £8. Can also be collected from Victoria area of London.
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