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Kevin Kretsch

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About Kevin Kretsch

  • Rank
    Nebula

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  • Gender
    Male
  • Interests
    Guitars, Astronomy, Bowling, Science, Cooking
  • Location
    Paris, France

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  1. THIS! Especially with the eyepiece port open like that, seeing that must dirt and dust on the outside, the internal dust must be correctly dealt with. A small amount of dust on the front glass is relatively easily dealt, and even possibly ignorable, but the internal mirror surfaces are easily permanently damaged if something goes wrong. I would recommend giving it to someone who knows how to do this. In fact, I think Clay Sherrod is still offering his cleaning and tune-up service... http://arksky.org/aso/supercharge No better man for the job. Assuming there is nothing othe
  2. I have a 15mm, 20mm, and 26mm 4000 Super Plossl and I really like them. They are better than my 17mm Celestron plossl (a 1990's "Halloween" model) and my 32mm Orion Sirius plossl.
  3. I feel like magnifying the blurryness makes my brain unhappy. It "wants" to see the details at a certain scale. Getting too far away from that doesn't help. For me, I'd vote image no 2 or 3. 1 is nice but too small to see the details, and 4 is too big, just looks blurry even though it has the same amount of detail. Throw in the loss of brightness and I'll vote for number 2. FWIW, I've never successfully used more than ~40x per inch with Jupiter in my ETX-90. And I don't recall a tight double within Rayleigh criterion that I couldn't split at 25x per inch.
  4. My ETX-90 has a 1250mm focal length so it doesn't take short focal length eyepieces to get magnification/seeing limits. My highest magnifcation is with a 15mm + barlow to get 166X but that usually too high to be useful.
  5. First off, the Meade series 4000 Plossls are actually really good. Yeah, people gripe about where they're made or not made, and wax lyrical about the mythical early Japanese made ones that were polished with magical unicorn fur, but they are all good, some even say better than most other plossls apart maybe from Tele Vue. Forget about the ETX-80 for planetary. It's great for wide field star clusters and such but too short a focal length for high magnifications. The ETX-90 is fine for planetary, due to it's long long focal length (which also means cheaper eyepieces perform better) bu
  6. Nice shot! There is something really nice about the range of shades here, I mean, yeah, it's a little dark but it's gorgeous dark!
  7. Welcome, Jeremiah! My ETX-90 is 22 years old. It's had a few repairs and fixes along the way but it still works and optically it is as good as it ever was.
  8. Thanks Pebo. Helpful hint from one noob to another - nebula, white dwarf, sub dwarf, and brown dwarf are not user names. I was getting terribly confused, that was why.
  9. Some eyepiece lines are parfocal amongst themselves, and some are not, and some change over time, and some eyepieces of different brands are parfocal with each other and some are not. Is there a list what's parfocal with what? Is it plausible/possible to do one? FYI, my 1998 Meade Series 4000 26mm Plossl is not parfocal with my new Chinese Meade series 4000 Plossls 20 mm and 15 mm (which had I known would have definitely influenced my purchase decision). But the new Meade Plossls *are* parfocal (or very close to ) with my 1990's Celestron Plossl and the Orion Sirius 32mm Plossl.
  10. Can I suggest slightly different approaches? 1) Tin foil very gently pierced with a small sewing needle. You can literally make them in seconds, with practice you can get very good at making tiny holes. Fold the tin foil over the front of the LED torch and hold in place with tape or rubber bands. Yes, it's a bit DIY and fragile not a lovely robust thing you can pull out of a case and go (although with a little ingenuity you could make it so). 2) A ball bearing. The reflection of a light source in the surface of a convex mirror always appears reduced in size. A 1cm diameter ball bear
  11. Wow! What lovely welcome! Thank you everyone! I like this place already!
  12. Hello everyone, My name is Kevin. I'm 47 years young, an Irish and American citizen who grew up in Ireland, just north of Dublin, ans currently living in Paris, France. I have family all over the US but Buffalo, NY, is also somewhere I call home. I had been stargazing with my dad since I was a kid but started "real" astronomy back in 1995 with my first pair of 10x50s followed by an ETX-90EC in 1998. I moved to Paris in 2000, though the ETX stayed in Ireland and got very little use. With Coronavirus lockdown I had a good opportunity to get my old ETX up and running again. Even though I liv
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