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juliangeorgeshaw

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About juliangeorgeshaw

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    Puimichel, France

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  1. Great image Andrew! Do you (or does anyone else) use the new Tak EDP flattener for the FSQ-85? https://www.takahashiuk.co.uk/Focal-Reducers/1399-/Takahashi-EDP-Flattener-for-FSQ85 What do you think of it? Julian
  2. Hi Louise I didn't mean to be a wet blanket . I meant to say that most Barlows are designed with visual use or planetary imaging in mind whereas the A-P Barlow (and in particular its dedicated extension tube) was designed by a DSO imager (Roland Christen). I think other Barlows would work optically but you might have to figure out a way to make the imaging train rigid enough for multi-minute, long focal length exposures. However note that even with a Barlow your 115mm APO's focal length won't be that long so it might work. As for the dark NZ skies, yes they certainly helped but
  3. I had another look, this time on my on my iPad. Now the colour looks great. On my monitor (a Dell Ultrasharp) the halo surrounding the galaxy looks greenish and the rest of the image has a magenta-ish cast. So I take back what I said about the colour . I would still be tempted by a bit more sharpening (I know, typical rookie's error ).
  4. - Julian here. The integration time was about 7.5 hours total of which about 5 hours was luminance. - I tried processing the data myself (with PI) and made a hash of it. Olly very kindly offered to demonstrate what he could with the data and PS. As expected he's done a fantastic job, much better than I ever could and yet... And yet to my debauched PI-eyes it could be improved with a little less colour saturation and a bit more sharpening to bring up the pie crust . To my eyes it's a little soft. I'm still a newbie and this is just my opinion (and monitor), I'm sure others would say "natur
  5. W-h-a-t d-i-d y-o-u s-a-y?? Yes it's W-I-N-D-Y here in Tekapo where I am trying to filch some more Kiwi photons. I almost got blown off the top of Mt John, home of NZ's famous observatory https://en.m.wikipedia.org/wiki/Mount_John_University_Observatory After days the wind has stopped but tonight it's cloudy When the sky is good here it's very, very good; I measured SQM 21.95 on the first night I got here. Thanks for the welcome. Incidentally I like your website which has great images but is more than just pretty pictures. I have noticed that the Kiwi astronomers I have met do serious
  6. Wonderful image! Thank you so much for sharing your workflow and script. My PI processing is so muddled I can never remember what I did last time
  7. I'm back in wonderful New Zealand. With me I have my trusty Tak Baby Q (which was recommended to me by Olly Penrice and I've never regretted buying) and a second hand HEQ5 mount and tripod, the legs of which I trimmed by about 10cm so that it would fit in a suitcase. The HEQ5 and tripod in the suitcase with the handset and some wires etc. weighs in at just under 23kg. This is crucial since the China Southern Airlines baggage allowance is 2x23kg bags (most other airlines do not limit the number of bags but the total of their weights must be less than 30kg). The counterweights were too heavy to
  8. Because I had a dangling USB cable and I was stupid my mount pulled the USB socket out of my Atik EFW2 filter wheel . To Atik's enormous credit they will replace the entire EFW2 circuit board for EUR 30.80 + shipping + VAT which is great service. But I don't want to do it again! Because this particular mount is a travel mount I can't tie everything down. One way to attack the problem is to have a USB hub which moves with the scope. Then you only have one USB cable from the scope to the PC to worry about (and one power cable from the scope to the power supply). The HiTec Hub Pro Ultimate sadd
  9. Olly I would be hugely flattered if you incorporated my data in your and Yves' fantastic image. Just let me know the best way to get it to you. (I am in NZ now with my mighty Baby Q which is best thing I ever bought which is thanks to your recommendation).
  10. This is a wonderful image. But I think there would be a lot more detail in The Squid if Olly had used a sensitive Sony chipped camera (and an Astrodon 3nm filter). (see the thread http://stargazerslounge.com/topic/246170-is-cmos-rather-than-ccd-the-future/page-4?hl=%2Bolly#entry2752941
  11. This is a great example Horwig, evidence always trumps assertions. To my eyes the top image is MUCH better. If, as I suspect, it's made with the Sony chipped camera it confirms that there really IS a trade off between the real estate of the Kodak chips and the sensitivity of the Sony chips (which is what one would expect comparing the sensitivity charts for the two chips). [if the two images are the other way around I will look a bit silly ] Is real estate king? Or is it sensitivity? It depends on your target doesn't it but for me it's sensitivity. The relatively modest extra real estate of t
  12. The Squid? Did someone mention the Squid? Here is some evidence bearing on Olly's question (does the principal advantage imaging the Squid accrue from using a Sony chip or from using an Astrodon 3nm Oiii filter?) and Zakalwe's question (does the extra sensitivity of the Sony chip vs. the 6303 make a difference in general?): Nicholas Outters (the Squid's discoverer) used a Tak FSQ-106, Astrodon 3nm and 5nm Oii filters and an SBIG STL 6303 chipped camera. You can see his results in this document: http://www.outters.fr/images%20site%20astro/decouverte-OU4-eu.pdf For contrast my image is here: htt
  13. You are right about Oiii. I bought Astrodon narrow band filters (even though they are so darn expensive) because of your images and I am glad I did, thank you Sara. They really are worth the money. But I also paid extra for the 3nm Oiii filter because someone (not you) said it can be used successfully in moonlight. That doesn't seem to be true in my experience. (It was in one of those OSC vs. mono posts; I do agree that mono is better but that claim was gilding the lily.) I also agree (in the south of France) with your rationale (in Spain) for switching from Atik to QSI; the cooling on the 46
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