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Rick_It

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About Rick_It

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    Nebula
  1. Rick_It

    Celestron Skymaster PRO 15x70.

    I had the SkyMaster PRO 15x70, I tested them two weeks but I was not satisfied and I returned them. The reason is chromatic aberration in daytime use. Too much, at least for me. It was winter and I still remember the violet halo surrounding the branches of a tree I was looking at. They were good for astronomy however.
  2. This is a free Sky Atlas with a layout similar to Sky Atlas 2000, by Wil Tirion. There are 26 charts, in colours, down to mag 8.5 for stars and mag 12 for DSO. Each chart has associated a a list of all the DSO objects, ordered according to their magnitude + some double stars and variable stars. There is one atlas for each year, and each atlas incorporates data about events of that year. Epoch coordinates are also in the given year. Year 2020 and 2025 are simplified versions perfectly fit to be printed in A4. In my opinion it's very good and it fits a good niche between large atlases like Interstellarum and small / beginner atlases which go down only to mag 6.5-7. Link (it's the second project): http://conga.oan.es/~alonso/doku.php?id=projects PS: sorry if it is the wrong section, I have not found a "Book" section.
  3. Rick_It

    What short focal length EP for a frac?

    What about a 9mm Ortho + 3x Barlow?
  4. As long as you are in EU, drop a mail at this guy in Germany. For sure he can make it, possibly he will do it. Some years ago he made a very nice 8" truss tube, very lightweight. http://dietermartini.de/
  5. The eyepiece is only 52°, very far from maximum TFOV for a 2". So if you have a 2" focuser and a normally designed telescope, there should be no problem. Why your society got this eyepiece, and not a 40mm 62° or a 40mm 68°?
  6. Rick_It

    1.7-1.8x barlow?

    I was thinking at the same solution, thanks. Probably I will look for a Meade 140 on the second hand market.
  7. Rick_It

    1.7-1.8x barlow?

    Thanks, I was not aware of that product. Yeah, it's a 2", for sure it will not vignette the 16mm. I wait for some other reply, maybe a 1.7-1.8x 1.25".
  8. Rick_It

    1.7-1.8x barlow?

    I'm looking for a low power barlow, around 1.7x - 1.8x. Scope: VX8L 200/1200. My eyepieces: 28mm 68°, 16mm 68° and 5.5mm 62°. I have a gap between the 16mm and the 5.5mm. I could buy an eyepiece, but the 16mm is very good optically and has no internal barlow. Moreover, in that way I can also increase the power of the 5.5mm, something I will use rarely but it appeals me. Problem is, a 2x barlow is a bit too much. Too much magnification for the 5.5mm (436x) and too small exit pupil for the 16mm (150x, i.e. 1.33mm e.p. while I was looking for something around 1.5-1.6mm e.p.). Most importantly, any solution should not vignette my 16mm and should not be too expensive. Any suggestions? Thanks!
  9. What's the difference between: Europe Royal Mail: Europe Royal Mail Tracked & Signed: The first one has no tracking number of both have tracking number but only the second requires to sign when delivered? Thanks
  10. Sorry Peter, obviously I was not aware that you built professionally binoscopes
  11. Peter, it's up to you (of course). However: 1. If the use is mostrly terrestrial, then there are far better alternatives on the market for straight through units which (i) are rugged enough to be backpacked and light enough to be used hand-held, (ii) provide correct-oriented vision and (iii) are flat-field. Example: APM MS50ED. 2. If the use is mostly astronomical, then 90° degree are far better than straight-through (I can't stress enough the "far better"). In this case it really does not exists ANYTHING in the market comparable to the 50mm ED binoscope you want to build. ANYTHING in term of size and in term of costs (500€ w.r.t 1500€ of APM angled binos). So, whatever it takes, use 90° diagonals, even at the cost of cutting the tube
  12. Hello Peter, if you are willing to machine the structure for a binoscope, I think you can consider to simply cut the tubes, remake the M53 thread and solve once for all the problem of not enough backfocus.
  13. Thanks everybody for all your efforts! I'm very interested in the Baader T2 prism, because I have a 28mm/68° (2" barrell, but a T2 opening is enough) which would provide me 8.6x! I bet this objective is the same as the Celestron Hummingbird 50mm ED. Since the Hummingbird exists also in the 56mm ED version, maybe SW will come out with a 56mm Evoguide with enough backfocus for a standard diagonal. They can use the same tube and focuser, just a different lens cell (the 56mm objective has a 29mm longer focal lenght!).
  14. There is a single screw before the focuser, the first screw after the end of the white tube. What's for? To remove the focuser section? Because, if the focuser section can be removed, then someone with a machine shop can cut about 1cm of tube and solve once for all the diagonal problem. I'm also interested on that scope, but it needs to work with a diagonal. PS: I really cannot understand why SW has not made the tube 1cm shorter and the extension tube 1cm longer.
  15. If I have not miss something, anyone has tried the ED50 with a 90° 1.25 prism diagonal. Those are the diagonals with the shortest optical path. Amici prisms have a very long optical path. To be clear, the Celestron prism diagonal which comes with all SCTs is a very common example of a 90° 1.25 prism diagonal. Baader T2 prism is another example. A barlow should also extract focus a little bit.
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