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pipnina last won the day on March 26 2018

pipnina had the most liked content!

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About pipnina

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    Sub Dwarf

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    Devon, England.
  1. My usual summer astro drought continues. In the last 4 months I've basically only had 1 look at Jupiter and Saturn.
    Sad, but the longer nights will come back soon and the garden is doing well in the mean time.

  2. Well, he already wants a tool shed. Maybe I can propose an "extension"
  3. If there were more clear nights, I'd be in very good shape by now. The HEQ5+Tripod+5Kg weight is something like 28KG to hug-lift, and a very awkward shape. An observatory would be a godsend, but I doubt my dad would let me ruin his garden.
  4. Hi guys, took this image last night of M101 but it is in dire need of some flats as you can see. What method do you guys use to take flats with the 130-PDS that minimises adding more tray light than you started with? last time I tried I got a gradient from one side of the image to the other...
  5. Can you remember the integration time of the DSLR/OSC/MONO images? It would help judge the difference in effectiveness.
  6. Something I believe Ollypenrice has said before is that OSC cameras have bayer matrices that have twice as many green pixels as blue and red, which is not useful for astronomy since most of the colours we try to capture are blue and red! And in filtered mono images, green is often the colour left with the least exposure, not the most. An OSC camera also makes emission line filters useless. OSC might be worth it for planetary imaging but I don't see much appeal beyond that personally.
  7. Good sky tonight :D Got the imaging scope pointed at flame/horse/2023, and had a look all around with the visual scope! Clusters in gemini/auriga, nebulae in orion (maybe a glimpse of flame). Saw the andromeda galaxy as well as 81/82. Hoped to find Uranus but no luck :( Too much pollution to navigate the area properly and finders frosted up.

    Hope the rest of you got lucky too!

  8. I think a healthy dose of narrow and wide shots make a happy amateur astronomer. Seeing the finer details of filament and mottling in the flame nebula can be just as stunning as seeing it in place with the horsehead, NGC2023, M78 and the brightest patch of the loop all in one image. Just stunning in different ways. I do agree with Olly though, you can gain a better appreciation of say the Pleiades when it's in an image that stretches all the way to the California nebula, and has the background dust and gas showing between them. You get some extra perspective like looking at an entire cathedral vs admiring a single stained glass window.
  9. I'm not an expert, but I might hazard that the Celsius scale has been redefined for simplicity at some point. It doesn't really perform any hard scientific logic to where the scale starts and ends (since the properties Celsius represents at either end of the scale vary depending on the environment!) and if we had determined some base for 0°k, which is far more important scientifically, the SI people may well have just decided to round Celsius off for simplicity. That's just a theory, but it may have some truth to it since as you say such round numbers are not common in physics. The closest thing I can find to support this is that the "triple point" of water is 273.16°k (0.01°c). Perhaps they set the Celsius scale to that end?
  10. My experience has not been great. The LED bulbs they've put in where I am seem to be brighter than the old yellow lamps, not dimmer. On the counterpoint they do seem to direct that light downwards better than the old ones. If there is someone who does have good before/after photos, I'd love to see them.
  11. I have a target for tonight! I got a 55-200 lens for christmas and this is test #1. Beautiful night so far so finger's crossed! Also, your subs are better than my whole stacks!?
  12. Something like this might provide a good surface to shoot at for flats? https://www.amazon.co.uk/32-Inch-Portable-Translucent-Collapsible-Reflector/dp/B002ZIVKAE/ref=sr_1_1_sspa?ie=UTF8&qid=1546970257&sr=8-1-spons&keywords=photographic+reflector&psc=1 Also, flats don't need a perfectly reflective surface because your lens should be focused at infinity while the target is considerably closer.
  13. How did you find collimation? It seems to be delivering some great results so I presume it went well?
  14. One of my favourite object pairs, and a lovely image of them at that! Well done
  15. A DSLR might not be the best way to start, but it is the cheapest! I got mine for only £230 pre-owned from London Camera Exchange. As much as I'd love a cooled CCD I wouldn't be imaging at all right now without my DSLR.
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