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Louis D

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About Louis D

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    Sub Dwarf

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    Texas, USA
  1. Have you verified the usable eye relief via flashlight (torch?) projection? The 30mm eye lens would indicate more like a 74 degree AFOV at 20mm of eye relief or 18mm of eye relief with an 80 degree AFOV.
  2. Travel scope?

    I've seen them listed for $20 on Craigslist here in Texas. I've never been quick enough to snag one for that price, though.
  3. The BST starguiders supertest!

    That's a shame given how much of Scotland is very dark. A lot of folks in Texas buy large parcels of land just to keep the neighbors at a comfortable distance for this and other reasons.
  4. Baader Eudiascopic

    That's consitent with my experience. The 1.25" XWs and 17mm Nagler T4 focus at the shoulder (more or less), the 12mm and below Delos as well as the 24mm Panoptic and many other TV eyepieces in the "B" focus group reach focus 0.25" or 6mm further out while the 14mm and above Delos reach focus 0.23" or 6mm further in. My Speers-Waler 5-8mm zoom requires the most in focus of all my eyepieces. It varies by focal length, but is at least 10mm.
  5. I don't like my 6mm

    On extended objects like Jupiter, contrast seems less as the available light is spread out to magnify it more. That might be what you're seeing. I often drop back to lower powers despite the smaller image size to see if the image improves. The stars may seem less sharp because you're getting close to revealing the airy disk of the stars with the 6mm. Once the airy disk is revealed, the only point to increasing power is to try to reveal close companion stars by detecting an elongation of the airy disk.
  6. Travel scope?

    I would still probably go with the Skywatcher Heritage-130p Flextube just for the extra aperture, ability to collimate the primary mirror, and collapsibility for transport. If you watch classifieds ads, you can probably pick up the blue penguin (SW Infinity-76) for cheap, though it's pretty cheap new.
  7. Baader Eudiascopic

    I've always wondered just how much in-focus is required for this eyepiece. If you have an eyepiece known to focus at the shoulder, could you then put your new eyepiece in the focuser to see how much you have to move the focuser inward to reach focus? Thanks!
  8. The BST starguiders supertest!

    Where do you live, in a parking lot? That's quite an excessive number of street lights for any neighborhood viewable from a single house. I've just got my neighbor's single back porch light that he leaves on day and night to deal with. I usually just stack a patio chair and recycling bin on my large garbage cans to effectively block the light as seen from my back porch where I usually observe.
  9. Televue plossls

    My favorite eyepieces for binoviewing are B&L Ultra Wide Field 31-15-74 eyepieces adapted to 1.25". Excellent eye relief, reasonably sharp to the edge, 60 degree field, and very easy to get your nose between them.
  10. Televue plossls

    26mm Orion Sirius Plossls bought used for $20 each many moons ago.
  11. Plossl

    There was one reflector designed for terrestrial use, the Zuka. It was reviewed here.
  12. Televue plossls

    To clarify, the 26mm plossls have the eye lens recessed so much that they're uncomfortable to use with eyeglasses. The 62 degree aspherics are just as sharp in the center 50 degrees as the plossls, and with the rubber eyecup removed, they are quite comfortable to use with eyeglasses. Sure, they fall apart a bit at the edge, but in binoviewers, you're more or less locked in to looking straight ahead to hold both view simultaneously, so that poor edge is in my peripheral vision where I can't resolve the imperfections.
  13. They're sleepers on the used market. In addition, the focal length is long enough to screw the lens element onto the front of a 1.25" diagonal and still get between 2x and 3x magnification.
  14. Televue plossls

    At ~25mm, I use a pair of 26mm Plossls in my binoviewer. However, I prefer the view through my cheap 62 degree 23mm ebay-special eyepieces in my binoviewer.
  15. Plossl

    I you don't mind looking over the tube from the other side such that your head is upside-down, you will get what appears to be an upright image.
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