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    • By acr_astro
      Dear all,
      yesterday afternoon, the forecasts for the evening were good so I set up the 10" truss-tube Dobsonian on the terrace for cooling down. Actually in the evening the sky wasn't as clear as expected but the cirrostratus luckily did not harm too much. It could have been brighter but anyway ...
      So I tried my new 2x focal extender with the 10 inch scope for the first time and magnified up to 370x. Seeing was okay and I really enjoyed travelling along the terminator from Plato via Copernicus down to Clavius. For the 10"er the focal extender is really an enhancement when viewing the moon and conditions are okay: I saw much more detail in Clavius as I have ever observed before. 
      This would have been a good sketching target but finally I decided to go for a sketch of the magificient Copernicus (named after the famous Polish astronomer by Giovanni Riccioli mid of the 17th century): 
      The crater floor was still completely in darkness, one could only see the bright, round rim of this 93km wide crater. The terraced slopes were just partly in the lunar sunrise yet. Obviously the central peaks are as expected lower than the rim - they were still hidden in the darkness. The two craters north of it are Gay-Lussac A and Gay-Lussac on the way to the Montes Carpates with their eastern parts already visible.
      Here's the sketch:

      Telescope: Martini 10" f/5 truss-tube Dobsonian
      Eyepiece: Explore Scientific 6.7mm/82° with Explore Scientific 2x focal extender
      Date & Time: Jan 22nd, 2021 / 1900-2000 CET
      Location: home terrace, Dusseldorf region, Germany
      Technique: Koh-i-Noor charcoal, whitecoal and chalk blocks and pens on black sketching paper
      Size: 11"x11"
      Clear skies!
      Achim
    • By ThadeusB
      I have for sale my Skywatcher Startravel 120. Objective lens 120mm; Focal length . It is in excellent condition, clean and only very minor marks. Clean optics, no fungus. The focusser is the original one and works smoothly; 1.25" and 2" adaptors. With both caps.
      A very good starter scope, or good as a portable scope.
      Included accessories: red dot finder; 90 degree star diagonal; 10mm & 25mm EPs; mobile phone adaptor. All in as new condition.
      Please don't ask me to split this package.
      Price £140.00 no offers.
      It will be very well packed.
      Payment: paypal or bank transfer
      I can deliver by Hermes; I can get a quotation for this if you wish. Or you can make your own courier arrangement, or collect in person.
      Please PM me if you would like more information.









    • By Kimboman
      Hi I went out this early evening to see if Saturn and Jupiter were observable but the clouds dominated this area.
      The Moon however was in a very clear area so I used my MeadeETX90 with a bino viewer with two 25mm eyepieces and spent some time viewing it.
      The views were really good as the Moon was in the first quarter which is when I feel is one of the best times to view it as it is not to bright.
      The shadows that were being cast were amazing but once again the clouds rolled in so until the next time??
    • By theonlypromg
      The Great Conjunction
      who else waiting for the Great Conjunction between Saturn and Jupiter in 21 December 2020
      Click here to watch
       
       
       
    • By Astrofriend
      I bought another 300 mm lens as an alternative to the Canon 300 mm L lens I already have. The main reason is to achive a lower vignetting. I have very positive experience from an earlier medium format lens. This is the Pentax 645 300 mm ED f/4 lens with good reputation. If I get some positive results from this lens I maybe replace my Canon 300 mm lens with this one.
      Here is some photos and data about the lens:
      http://www.astrofriend.eu/astronomy/projects/project-pentax645-300ed/01-pentax645-300ed.html
      I bought it mostly because I'm curious about it and want to test it. It's more than ten years older than the Canon lens.
      Lars
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