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About Dave1

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  • Interests
    Astronomy, Motorcycles, Theology, Philosophy , Music.
  • Location
    Dorset, UK
  1. Dave1

    Vixen Orion P-80L

    Hello everyone, time has come were I need to thin my telescope collection. I have two 80mm F15 telescopes, one of them has to go! So for sale is my Vixen Orion P-80L telescope. Its a French rebadge version so is called SBS. This telescope is a mid 1980's model. The previous owner fitted a dual speed Crayford focuser, which does the job. It comes with telescope tube rings, dovetail, and handle. I've flocked the dew shield, upto the first baffle behind the lenses, and upto the first baffle from the focuser, the draw tube itself in the focuser is also flocked. For its age it is in very good condition, with only a few marks on the OTA tube. The lenses are clean, with no damage. I'd prefer collection, but can post at buyers cost. £200 + postage. The Vixen telescope, is the one you can see at the front closet to the camera. Dave
  2. Dave1

    Hello from near the New Forest

    Hi welcome to the forums, I'm from Wimborne, Dorset, the other side of the New Forest. Generally the planets this year are low, which means you will be looking through a lot of air, which degrades the image, and hides a lot of the detail. The transparency was pretty bad last night as well. Generally when the planets are 30 degree or above is the best time to observe them. Dave
  3. 1. Quality of the eyepiece, its design, what glasses it uses, how many glass elements? 2. Is this design eyepiece optimal with my telescopes, is it rated highly for planetary observation? 3. Peer reviews, what are experienced amateur astronomers with loads of eyepiece experience saying about a particular eyepiece including a particular focal length for a given eyepiece. Dave
  4. Well the Vixen has a modern Crayford focuser, which the draw tube is over 2" in diameter. Like all modern draw tubes it has loads of micro baffles, but being made of black anodised metal was still highly reflective, coursing stray light. So it got flocked. Will let you know how it goes, I hope now its low contrast performance on planets will match the Towa or exceed it. Dave
  5. Unfortunately it was cloudy over here last night. Hopefully it will be clear tonight. Im itching to try my Vixen 80mm F15, as I spent most of a night a couple of nights ago flocking anything that reflected light in the ota tube. Including the focuser draw tube! Also flocked the dew shield, and I flocked to the first baffle behind the ota. I also flocked to the baffle closest the focuser, and any part of the focuser that was flat facing the lenses got flocked as well. Now the ota tube looks flat black, no stray light from either the focuser or lens end of the tube! Should be an improvement in performance! Dave
  6. Thanks @vlaiv Well both telescopes have Magnesium Fluoride coatings on the lenses. I was always lead to believe that any unnecessary light in the optical train, stray light etc, like light reflecting off the inside of a focuser tube, robs performance of low contrast planetary details? Is that a definite? Dave
  7. Thanks @vlaiv I understand the glass type, quality, figure, and polish will impact on the quality of the lens. The Strehl ratio etc. I also understand that each observer is different in how they perceive the world. I'm the only observer involved in the above observations. If everything being equal. Same glass, same quality of glass, same figure, same polish, same strehl ratio, same observer. Good seeing conditions and transparency. What would cause the above mentioned differences? Would light scatter being less well controlled in one telescope over the other course the difference in contrast and definition? Dave
  8. @Moonshane thanks for the reply. The low contrast differences between the two telescopes has been observed in two different observing sessions on planets. The polar cap difference has only been observed in one observation session. So maybe I should do a third session comparing the two telescopes to see if the previous results are repeatable with regards to the southern polar cap. Dave
  9. Hi folks, I have some questions for the more scientifically minded people of these forums. First a bit of back a story. I have two 80mm F15 telescopes. I did a comparison of the two telescopes, on the same evening, using the same diagional and eyepieces. Collimation being correct for both telescopes. I noticed a difference. In telescope number 1 the definition between high contrast details like black and white was superior, the south polar cap on Mars was alot easier to see, and appeared alot more white than in telescope number 2. Telescope number 2 had superior low contrast performance, being able to resolve the albedo details better on Mars that the other telescope, the albedo details were easier to see, but the polar cap did not appear as such a glowing white, and didn't stand out as much. I apologise for not using scientific terms, what would course this performance difference? Dave
  10. Dave1

    Show us your Frac

    Looks very good! Interested in reading your first light report with this telescope.
  11. Dave1

    Mars moons, Phobos & Deimos

    Impressive indeed, well done MarsG76
  12. Dave1

    Planet 9? Is it real?

    I hadn't of heard there this theory about the maths being wrong? I wouldn't even want to try the maths! I had heard the theory that the disturbance in Neptune's and even Saturn orbit I think? Was natural and nothing out of the ordinary.
  13. Dave1

    Brief but good Mars tonight

    Sounds like you had a good brief session, weather has been a total wipe out tonight. Been rain on and off quite alot. Dave
  14. Dave1

    Planet 9? Is it real?

    It does seem strange that a big planet would be further out than Pluto and the Kelpier belt. But I can see the point the article makes at how hard a planet would be to detect a 1000AU. @mikeDnight love the photo of the inhabitants lol, so has Pluto been reclassified as a major planet then
  15. Dave1

    Planet 9? Is it real?

    The article is mainly refering to a massive planet bigger than earth that may be effecting the orbit of other planets in our solar system.

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