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gorann last won the day on March 13

gorann had the most liked content!

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About gorann

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    Brown Dwarf

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    Värmland, Sweden (59.77 °N)
  1. For those of us engaged in imaging, here are some scary news: https://www.bbc.com/news/science-environment-48289204 Apparently Elon Musk alone is planning to put up 12 000 satellites, and others are also planning for sending up more satellites. Right now there are 2000 functional satellites according to the article and that is bad enough for astrophotography. I am dreading what our subs will look like in a near future. I did not see any such fears expressed in the news article even if it is in the science-environment section.
  2. Interesting thread. Like some say there, most of us would probably be more interested in an APS-C sized mono CMOS due to the cost of filters for a full frame chip (and need for scopes with large image circles). According to that CN thread, ZWO have said that square 2" filters are recommended and that would probably cost as much as the camera if not more. 60Mp is also a bit over the top but it can of course be software binned.
  3. I just stumbled on this camera being advertised on the OPT site and they take pre orders. When I googled it I see that OPT may have indicated a price of 5000 USD at some point (see attached screen dump) but on the OPT site no price is now given. https://optcorp.com/products/zwo-asi6200mm-p Does anyone know anything more about this camera? Seems like the one many have waited for.....
  4. I think Olly is right in saying that there is nothing wrong with a well collimated Newton, and it is likely to outperform an achromat. Have a look at what Jens Zippel produces with his 10" Newton (and a 6" Newton would not be very far behind in the right hands). He gets a Top Pick or Image of the Day recognition for every second image he posts on Astrobin: https://www.astrobin.com/users/Jedi2014/ I think a good idea would be to stick to your Newton until you saved up for an apo, if you decide you really want a refractor. Buying an achromat now would make it take longer to save up for an apo.
  5. Thanks! That is what I also would try first if I have strong Ha and Oiii data (as often suggested by Olly).
  6. Superb images both of them, and this is a question to both Peter and Olly: How did you mix in the NB data to the RGB? Just Ha to red and Oiii to blue? Or did you only use the RGB data for the stars? Göran
  7. Wim @wimvb just had his first season with MN190. He may have an opinion....
  8. One problem is of course that the nicest planets (Saturn and Jupiter) will be more or less out of reach from Northern Europe for the next few years if I got it right.......
  9. Great image with an ingenious combination of scopes - letting the old London scope help out by looking through the fog where the Spannish one could not reach. I like the idea of mixing FL and exposure times to tame objects like this.
  10. Yes, the data is the same (not much data by the way just 30 min of DSLR). In my original stretch it came out with a yellowish galaxy. Then I turned it towards blue using Lab colour curves in PS, which is the second version. Then I run both versions through Photometric Color Calibration in PI and afterwards they were both slightly changed but still very different so obviously that PI procedure did not "standardise" them to a known colour of the galaxy. Maybe it standardised the star colours but it clearly did something also to the galxy but it did not make the galaxy look the same in both versions.
  11. That is a PI work flow. I am a simple PS processor....
  12. I used on my final stretched images. Obviously that does not work but why not? Would be more convenient.
  13. Interesting tomato, in your new version everything seems to have been turned yellowish, so that procedure seems not to have worked too well. Meanwhile, I followed @wimvb suggestion and used Photometric Color Calibration in PI on both my versions (yellowish and blueish). It did a lot of calculations and altered my images (I used the default settings), but the end result was not the same for them, which I would have expected. So this is what the yellowish and blueish ones looks like now after the PI procedure. I have to say that it worked better on the bluish one as the other one now looks quite greenish.
  14. Nice image! Regarding your reducer: For Celestron EdgeHD and Meade ACF, a reducer that is also a flattener will not work since those scopes already have flat fields. In that case the flattener function will create a curved field. However, you probably know this and I though maybe the CCDT67 was one of those that do not flatten the field. I know the Celestron original reducer for your scope is quite expensive but a relatively inexpensive reducer that is suposed to work is Optec Lepus 0.62x. However, the FOW of that one (and the CCDT67) is quite a bit smaller than the original Celestron reducers.
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