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About Ricochet

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  1. I have an Astronomik CLS filter that, depending on the target, is useful at pretty much all magnifications I view DSOs at (i.e. >1mm exit pupil). It's probably the only CLS filter I would actually recommend, but beware that as with almost all CLS filters it is aimed at the old style sodium street lights, not new LED lights. The IDAS D2 is designed to cut down LED emission, but as it is a "photographic" filter I don't recall anyone posting a review of how it performs visually. I also have a neodymium filter that is sold as a light pollution filter, but to my eyes it doesn't improve any DSO compared to the unfiltered view. It does, however, perform excellently as a lunar and planetary filter.
  2. Ricochet

    ES Dielectric Diagonal.

    Unless an adaptor has an extra long barrel that hits the prism or some internal baffle you should find that any adaptor will fit, just like an eyepiece.
  3. Ricochet

    Which Telescope?

    FLO do a 150p/AZ4 combo that I would choose over the 150p/EQ3-2 to avoid Newtonian focuser rotation. You also need a cheshire/sight tube for secondary mirror collimation and I would add a barlow if you want a laser collimator so that you can use the barlowed laser method for primary collimation.
  4. Ricochet

    Barlow for Binoviewer

    Is the nosepiece of the binomate threaded for filters? If so you can screw a barlow nosepiece to that. That's what I do with my Starguider binoviewer, using an AE AC555 for 2X (~30mm additional intravel needed) and one of these for 3X. Edit: You are right that reducing the distance between the barlow and eyepiece reduces the additional magnification. However, there is approximately 100mm of light path inside the binoviewer you have to account for. For the lowest magnification you want to be looking at nosepieces from an old style "long" barlow rather than a "shorty" so that the difference between the binoviewer light path and the barlow design length is minimised. (Although the aforementioned AC555 is surprisingly low.)
  5. Ricochet

    8" vs 10" Dob?

    I don't think it will make much difference. 12-8-5 will be fine in either, 25-18 will suffer in both.
  6. Ricochet

    Cleaning primary mirror

    After you've soaked the mirror check that the centre spot hasn't lifted and moved. Other than that just follow the video linked previously.
  7. Ricochet

    Air blower

    Look for one with a silicone tip. If you're blowing particles off a mirror or lens you don't want one with a solid tip that could scratch the surface. Generally, for mirrors you're unlikely to need one though. If it gets dirty enough that you need to be removing a mirror to clean it then it will warrant washing.
  8. If the eyepieces showed coma at f5 it is because they are good enough to show the coma of the scope rather than an eyepiece issue. However, the 18mm and 25mm will show field curvature and astigmatism respectively with fast focal ratio scopes. By f12 these issues have disappeared so you may find at f8 even these two eyepieces are well corrected. The rest of the range will definitely be fine.
  9. Looking at US prices $400 doesn't go as far as I thought so I would probably start by looking at the BST Starguiders in 5, 8 and 12mm and Explore Scientific 68° eyepieces at longer focal lengths. You could also pick up three of APM's Ultra Flat Field eyepieces for $400.
  10. Ricochet

    William Optics eyepieces - any good?

    According to the OVL website the internals are the same. Interesting that they seem to have changed the design.
  11. Ricochet

    William Optics eyepieces - any good?

    I've not used either of the eyepieces in question but I own a 28mm Nirvana and have owned ES68° eyepieces. My gut feeling is that the Nirvanas have slightly better coatings so I would go with the Nivana/UWAN.
  12. Ricochet

    Stunning NASA Lunar Movie

    If you click through to YouTube there is an explanation in the description. NASA have built a "digital 3D model" from satellite data and they have used that model to simulate what a geostationary satellite would see over a lunar day.
  13. Ricochet

    Stunning NASA Lunar Movie

    I imagine it must take quite a bit of computer power to render such a realistic animation. The combination of the music with the visuals is really good, I played it several times.
  14. Ricochet

    Filters ?

    For white light solar viewing you can either use a full aperture filter made from Baader film or if you have a refractor you can use a Hershel wedge. Don't be tempted to use one of the old solar filters that screw into the bottom of the eyepiece. For the moon and planets there are two filters to consider, a neodymium filter and a variable polarising filter to dim the image if necessary. For nebulae the two options to consider are the UHC and OIII filters.
  15. Ricochet

    Black spot while watching mars

    The focuser is not for zooming in. Unless you are using a special zoom eyepiece there is a fixed magnification for each eyepiece telescope combination. The point of best focus is when the object appears at its smallest. If you can see the secondary obstruction you are out of focus and seeing the inside of your telescope.

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