Jump to content

SkySurveyBanner.jpg.21855908fce40597655603b6c9af720d.jpg

Rossco72

Members
  • Posts

    2,035
  • Joined

  • Last visited

Posts posted by Rossco72

  1. Probably been covered a hundred times before, but given we average when stacking subs, is there a minimum number needed to make it worthwhile?

    If I have 60 subs, I can use something like subframe selector to assess just the very best ones or just to remove the very worst. If i just stacked the best 5 of 60 would I get a better average than if i stacked the best 50 of 60?

    Cheers

    Stuart

  2. This is an area half way between the two constellations. I am sure that the objects fall into one or the other but I am not knowledgable enough on that.

    This is 7.5 hours last night, SHO using Antlia 2.8nm filters and 10min subs for O and S with 5 min subs on H. ZWO ASI533MMPro, NEQ6 Pro mount, controlled by ASIair+ processed in Pixinsight. Shot against the full moon.

    Cassiopia-Cepheus.thumb.png.f01b13de724debc3190cea8e4e9be4fd.png

     

    Thanks for looking

    • Like 5
  3. 5 hours ago, ollypenrice said:

    It looks like the big problem you're facing is a strong left-right colour gradient, so that needs to be your first step. I would place the DBE markers as shown below and with a high tolerance. I avoid ABE on galaxies because it tends to put markers too close to them and so create a dark ring round them.  Using too many markers is counter-productive.

    The third image has the best gradient control but it is still there if we turn up the saturation. In Photoshop you can use the colour sampler tool (set to 3X3 or 5x5 average) to sample the background sky. I like the three colour channels to be equal.

    Olly

    The joys of LRGB imaging with a mono camera over different weeks with different moon positions! (I do try to avoid LRGB when the moon is close to the target or more than 50% lit. However with so few clear nights in Scotland, we can't afford the luxury of only choosing the best nights 😂😂😂

    Would you suggest DBE on each channel before combination or just wait and do it on the RGB image?

  4. Off the bat, nothing new here. This is just a journey for me on the Pixinsight / Photoshop processing journey.

    This is all the same data, just processed at different skill levels and software.

    My first process of my Andromeda data was in Photoshop, stacked images from ZWO ASIStudio and aligned in photoshop. I'm not an expert in PS by any means, and I was actually pretty happy with this at the time.

    M31-LRGB.thumb.png.2d7b39c1280480f42d464a880f191d9d.png

    After lots of cloudy nights and no new data to keep me interested, I started watching tutorials on Pixinsight and finally took the plunge! This now shows the same subs (well almost as PI rejected a few through the sub-frame selector) bt fully processed in PI with no photoshop at all!

    M31_2022.thumb.png.bb0f4c66c51906720c16cd2675fa8d19.png

    I was even happier with this and even posted on here.

    My final, if we can ever really say final :) , process took on board what I have learned and practiced to date, I think this is the best of the 3 but would love to hear your thoughts. Who knows, I may go back and do this again later this year with another 6 months practice under my belt. But I would really hope I will have captured more data and better framing this year.

    M31_Andromeda.thumb.png.e6e30c4ac37bab050cd2a0814f78ffa9.png

     

    One thing for this year will be shorter subs, try not to blow out the centre too much! 

    I did have some pretty bad LP gradients between the channels with a very noticeable magenta bottom left to green top right that proved stubborn to shift.

    • Like 12
  5. My final images processed from the data collected over the last 6 months or so.

    NGC7000 in RGB, this is only 1 hour of exposure, 20 mins per channel, given the low amount of time spent, I am actually quite pleased how well this turned out.

    Cygnus_Wall_v4.thumb.png.0dfcc4a743e3ed414a15ef0b4a3f62e2.png

    More centred on the Cygnus Wall, this image is 11 hours, roughly 3.5 Ha and 7.5 OIII. More detailed dust and dark structure for sure but I wonder how the RGB would look with 11 hours exposure?🤔🤔

    Cygnus_Wall_v1.thumb.png.b107662b7b8d92cc0a1a663aab71dd6f.png

    As usual, taken from my Bortle7 back garden in Central Scotland.

     

    • Like 5
  6. This has proved challenging to say the least. The capture of the lights was spread over 6 weeks as there was only the odd hour here and there of gaps in the cloud. The sky conditions, moon and seeing were all different across not only channels but sometimes half the light data for a channel was taken weeks apart! My PI skills are not quite good enough yet to overcome all of this, however here is what I have ended up with:

    4 hours Luminance, 1 hour each of RGB over a 6 week period between November and December 2022. WO GT81-IV, Flat 6, ZWO ASI533MMPro, ZWO LRGB Filters, NEQ6Pro mount

    M45.thumb.png.fd829fbe4bb7a7b1bc03b20722fc2edb.png

     

    Thanks for looking.

    • Like 11
  7. Shameless plug...

    My SHO effort from this winter. WO GT81, ZWO 533MMPro

    Wizard.thumb.png.b639b92027038705c1025ecff4a21717.png

     

    My processing skills are still developing, so I'm sure there is more could be done with this. The 533 and the WO GT81 are just about an ideal combo for this target.

    • Like 1
  8. I added more H and O to my previous post on this target, total integration time is now 14 hours.

    Processed using LRGB but with HSHO in Pixinsight.

    William Optics GT81-IV, ZWO ASI533MMPro, ZWO HOS filters, Skywatcher NEQ6 Pro mount, ASIAir Plus.

    New Version - 14 hours

    Wizard.thumb.png.fd214063fb473983a53d1548df302122.png

    Original Version - 9 hours

    NGC7380.thumb.png.13c97ee9ffedfae063e9bf4d37b32cbe.png

     

    Wizard.tif

    • Like 5
  9. This is a curious one for me, not one I had heard of but it popped up one night (19th of January 2023) under the highlights of the night section on my ASIair and with a fairly bright moon up I decided to go for Ha and OIII and pull something together in HOO.

    I actually think it comes out ok and I am pleasantly surprised with it. 

    William Optics GT81-IV, ZWO ASI533MMPro, ZWO H&O filters, NEQ6 Mount, Processed in Pixinsight.

    Happy for any feedback, it's the only way we learn...

    NGC1893_HOO.thumb.png.2bd53f8843ffd4d69f0211a4c89dcec3.png

     

    NGC1893_HOO.tif

    • Like 4
  10. It's amazing how short the season is even here in Central Scotland, so can only imagine how bad it gets for you with literally 0 hours of astronomical darkness during the summer months!

    Good looking images you have though.

  11. This has been a miserable winter for clear nights that weren't under a full moon, but also my most productive period to date. Having the gear set up in the Garden under a 365 cover has really provided more opportunity than ever for me and ASIAIR has been a game changer in not requiring a PC and what have dragged out and set up. I spot clear weather, I plug in the mount and ASIAIR and flick 2 switches and I am up and running. Great.

    Now if only my Pixinsight learning process could catch up... 

    M53 Globular Cluster

    M53-dark.thumb.png.5b65851db15893c15aa3eb0175df0ae6.png

     

    Rosette in HOO

    Rosette_HOO_Dark.thumb.png.ab30d566c24fc8a59637b60489e9d291.png

    Alnitak Region in HOO

    HOOFlameandHorsehead.thumb.png.d2ae426da97111ad1d34f86a31813197.png

    Andromeda in LRGB

    M31_2022.thumb.png.b6a13c260af05703156442e568027af3.png

    M33 Triangulum in LRGB

    M33.thumb.png.2a65719b36d21a5399a9eaefa3c4ca46.png

    Wizard Nebula NGC7380 in SHO Hubble

    NGC7380.thumb.png.2dff774fd457cf35e6380fa48250de5e.png

    Cygnus Wall in HOO

    HOOC_DBE.thumb.png.8a910f81c808fb5f13d9ebaf479585d7.png

    I'm sure there is enough data to get more from these but I will maybe have to revisit in PI once I (hopefully) become more proficient.

    Still my best 5-6 months in this hobby I have been doing on and off for 12 years now!

    Cheers

    Stuart

     

    • Like 14
  12. NGC7380.thumb.png.24b31a2a014e6807338c5d3a7def3d0e.png

    NGC7380.tif

    This is The Wizard Nebula, shot from my garden under a bright almost full moon!

    30x5 mins Ha, 30x5 mins OIII & 20x10 mins SII with ZWO filters - 6hr 20m integration time.

    NEQ6 - WO GT81IV - 0.8x Reducer - ZWO ASI533MMPro - ASIAIR Plus

    Processed in Pixinsight - my second image!

    Would like more time but when you only get one night every 2 or 3 weeks when it isn't cloudy you have to take what you can get. An interesting target though and high enough that I can image it all night without obstacles so I may return to it in the future.

    • Like 7
  13. I always feel inferior posting my images, one day I hope I can view my own work as on a par with some of the amazing shots in here!

    Anyway, this is my first image from my back garden in Scotland's light polluted central belt. The often posted Cygnus Wall, part of the North American Nebula.

    As always, needs more integration time, but this is about 1.5 hours of Ha and 3 hours of OIII. I shot some SII but it was unusable and I discarded some subs where the star sizes seemed out of ordinary.

    HOOC_DBE.thumb.png.d0d0a384ae054c4429e21c9f7c0a99ea.png

     

    ZWO ASI533MMPro, ZWO Narrowband 7nm Filters, William Optics GT-81IV on EQ6 Mount. All controlled by ASIAIR Plus.

     

    • Like 6
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.