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Showing content with the highest reputation on 10/01/16 in Posts

  1. 2 points
  2. 1 point
    Hi Guys I thought that this one might raise a smile on a cloudy afternoon. My precious ES 82° 24mm got a bit of a daytime knock back in November. After much cursing, I replaced it in its case and hoped for the best... Fast forward to Dec. I retrieved said eypiece. Popped it in the Dob with trembling hands - the view was awful. Deeply sad as this was a favourite eyepiece (and £200 off to the seaside). Wondered if it was just poor seeing. Tried again a couple of days ago. Same result. Although I was surprised to see Owl nebula standing out on a hazy night. I resolved to take it apart and realign the elements as there was nothing to lose. Today was the day so a close inspection revealed something strange...... I feel a right muppet, but it couldn't have worked out much better.
  3. 1 point
  4. 1 point
    Wow Gina, that's... bizarre. At 280C you should be printing puddles of plastic not having difficulty getting layers to stick together! I would suspect you aren't getting the temperature you think and the sensor is telling porkies! You're right about the sticky spray, it does need to be stone cold before it releases. A fan is a good idea, or I;ve seen freezing spray being used, or I actually remove the glass from the bed as that cools much quicker on its own. ChrisH
  5. 1 point
    I'd never heard of Lunar X til Joseki mentioned it. It's a great trick of the light and one that I hope to observe in reality providing the clouds stay away at the right time! It reveals itself about 11 seconds into the vid, with Rupes Recta making an appearance 17 seconds onwards. Martin
  6. 1 point
    There are a lot of repeated rumours and falsehoods in astronomy that get re-repeated with the telling. The alleged inferiority of spherical mirrors seems to be one of them. Spherical mirrors are easier for manufacturers to mass produce cheaply. In telescopes of around f6.9 with an aperture of 130mm (5.1") there should be no discernible difference between a spherical or parabolic, apart from the fact that the spherical mirror in the Explorer has a longer focal length effectively making it more powerful. Plus the OTA is slightly longer. I also believe spherical mirrors suffer less from problems like coma. I have no compunction to swap my spherical mirror OTA with a parabolic one. When you get a telescope of 150mm or more I would opt for a parabolic mirror, most telescopes above 6" have them anyway. The only advantage to the SW Explorer with a parabolic mirror is that the OTA is more compact. The disadvantage with the parabolic mirror is that it only has a focal length of 650mm. It depends what you prefer.
  7. 1 point
    Very nice lunar close up. You caught it right on the terminator.
  8. 1 point
    Certainly the Skywatchers 9x50 has a fixed eye piece.
  9. 1 point
    I never hesitate with refractors. Coatings on glass are hard. In fact they can be harmed by corrosive chemicals both man made and natural so regular cleans are routine for me. However, I'm far more circumspect with aluminium coatings on mirrors. In this situation I'm the original minimalist. Olly
  10. 1 point
    This is a 45 minutes exposure (90 x 30 sec, ISO 2200) using a Nikon D810A with a Nikon 200mm f/2.0 lens at f/4.0. I stacked the images in Pixinsight and then processed the final image in Photoshop. No darks, bias or flats was taken or used.
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