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gorann

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gorann last won the day on November 26 2018

gorann had the most liked content!

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About gorann

  • Rank
    Brown Dwarf

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  • Website URL
    http://www.mn.uio.no/ibv/english/people/aca/gorann/index.html

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  • Gender
    Male
  • Interests
    Astrophotography
  • Location
    Värmland, Sweden (59.77 °N)
  1. Thanks Firas! Yes, I suddenly realized the galaxies were a bit too saturated
  2. Thanks a lot David, much appreciated!
  3. Thanks a lot, Sounds reasuring! It often happens that I have a nap before a flip, especially if it is at 3 am, and sometimes I do not hear the alarm......
  4. Thanks! In lack of clear skies I have fiddled around more with the image so now there is even a bit more background and I also reduced the saturation a bit. Compared to my initial post is is defenitively an improvement:
  5. Right now I have my Esprits 100 and 150 side by side, but for the galaxy season your suggestion is one to consider (and it had struck me) . Maybe I find my AP becoming too much routine one day and will start looking for trouble..... By the way, what happens when the Mesu runs your cameras into the pillar?? Nice to know!
  6. Nigel, your post got me closer to put my big(ish) SCT on the mount, but first I have to replace my EQ8 with the Mesu 200 that has been on my living room table for over a month now (no major problem since we usually eat in the kitchen). I just need some clear nights in a row to get the energy to take on all the hassle of going from a handset to running it all from a computer and losing a night or two of imaging.
  7. Great image Nigel and an entertaining and interesting read. I have an EdgeHD11 essentially unpacked since I got it in the US three years ago at a very good price that became too tempting. But it has been sitting in a closet since then as my fracs have kept me more than happy. But it is nice to know it is there and that I can take it out and put it on the mount one day. As you say your image is not that much different from Wim's, but it does show a bit more details. One thing that Wim's scope appears to do better is to keep the star sizes down. It seems to be a well known fact that SCTs give big stars. Does anyone know why? Both scopes are reflectors but maybe it is the central hole in the primary mirror that somehow makes stars bigger? Not a major problem and if someone cares it is easily fixed with some star shrinking during processing.
  8. gorann

    NGC 2683 revisited

    You are welcome Wim, but it is a Newt, or a slight modification called Mak-Newt
  9. gorann

    NGC 2683 revisited

    Whatever works! Very nice image by the way Wim.
  10. gorann

    Julian Shaw's sombrero - with a surprise!

    Yes, forgot to mention that Power Mates and ES Extender constuction is called telecentric, but 3x is a bit over the top - making my Esprit into a 3300 FL scope may be to push it.....
  11. gorann

    Julian Shaw's sombrero - with a surprise!

    I just spent some time reading up on this. A Barlow in its original configuration is a simple two lens set with concave lenses or with three lenses in "apo" configuration (but some say that apo is of no use here), A Power Mate (as Tele Vue calls it) or Focal Extender (as Explore Scientific calls it) is a more advanced 4 lens construction that gives out a paralell light path so that magnification is independent of distance to chip (for a Barlow magnification increase with distance to chip). The Astro-Physics one is just a well made 2-lens Barlow but the Tele Vue and ES ones are of the more advanced 4-lens construction. The ES one may be as good as the TV one but at half the price. But what I have not figured out (but now asked FLO) is if the ES one can the screwed onto the camera or if a less desirable 2" "eyepiece"-barrel have to be attached to the camera (would make the image train less solid).
  12. gorann

    Julian Shaw's sombrero - with a surprise!

    Actually, I only think TS put a Feather Touch focuser on it. The transport case in their image is exactly the same as the one I got with my Esprit and why would they make their own aluminium tube? Regarding the TEC 140 and and APM LZOS 152, I would expect that the price differences (8295 Euro for the TEC and 8590 Euro for the APM and 5195 Euro for the Esprit) partly has to do with the focusers and mainly has to do with the land of production (Europe vs China). Still the standard Esprit focuser is a very good one in my oppinion - quite a step up from other SW focusers.
  13. gorann

    Julian Shaw's sombrero - with a surprise!

    It will be really exciting to see what you find Helen, and maybe you could bring your scope to a darker site.
  14. gorann

    Julian Shaw's sombrero - with a surprise!

    Not sure that the Esprit 150 is of any lower optical quality than the TMB LZOS 152 apo or TEC 140. Have not seen any tests saying that it would be, and there are plenty of reviews. Teleskop Service that sells all of these refractors says "We have been searching for a long time for the apropriate objective for a true high-end apochromat, and struck lucky with the Skywatcher ESPRIT 150. We have compared the image with other apochromats like TEC or LZOS and we have not found quality differences (https://www.teleskop-express.de/shop/product_info.php/info/p6463_TS-Optics-Photoline-150-mm-f-7-FPL53-Triplet---Starlight-3-5--Feather-Touch.html). In any case, whatever good quality apo refractor is used it would be interesting to see what people may find by using a Barlow.
  15. gorann

    Julian Shaw's sombrero - with a surprise!

    Really intrigued by this resurrected thread (started and nutured by @ollypenrice@Rodd@juliangeorgeshaw@MartinB@Thalestris24@Petergoodhew@wimvb and others). Has anyone done any more of this Barlow DSO imaging? Tempted to invest in a 2" Barlow / focal extender to turn my Esprit 150 into an f/14 galaxy hunter! Also not sure if I should go for the expensive Astro-Physics or Tele-Vue models or the more affordable Explore Scientific x2 Focal Extender. Maybe this approach only works on the bright Sombrero?
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