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Everything posted by Laurin Dave
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IKO - SH2-155 Cave Nebula SHO - Processing Competition
Laurin Dave replied to Grant's topic in IKI Observatory
Here's my entry, processed in Pixinsight and Photoshop. STF stretches, then Starnett on each of S, H and O, into Photoshop to deal with Starnett artefacts, combined as SHO in Pixinsight, combined Starry Ha as Lum using Pixinsight LRGB, selective colour in Photoshop, a bit of star reduction, Local Histogram Equalisation, sharpening, noise reduction, rotate and crop. Dave -
Hi Dave, I ran it though Pixinsight as follows: - register, crop, RGB channel combine, Dynamic Background Extraction on both , Photometric colour calibration, ArcSinh stretch on RGB, Histogram Stretch on RGB then colour boost in Photoshop using LabColour, HS on Lum and then LRGB combo... came out looking like this... Galaxy and star colours look ok to me. I'd suspect that its your colour calibration that's gone astray although as I'm not familiar with AstroArt I can't suggest how to fix it. The light streaks are puzzling as the nearest star in the direction they are coming from is HD214667 which is mag 9, Eta Pegasus could be the culprit at mag 3 but it is a long way off. I'd check that they are on all your subs and if not would suspect something closer to home. Focus quality also looks a bit soft and different between filters with green best and blue, I'd measure all your subs to see what's going on with focus. HTH Dave
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Here's your new RGB with your Lum from last years mosaic.. (i found this years was too stretched to combine) If it were me I'd get the spacing sorted and keep the camera... Dave
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So Steve, the question now is what does the Lum only look like ?
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Hi Steve.. I think your last one’s the best, background maybe looks a bit green on my screen, but very good, well done Dave
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That’s worked rather well Steve. Next step is to combine your other data with it 🙂. Dave
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North America Nebula, HA or not to Ha, that's the question
Laurin Dave replied to kirkster501's topic in Imaging - Deep Sky
All very nice Steve, I had a very similar experience and similar results when I did this last year. As Vlaiv says definitely more nebulosity in the HaRGB version but that one loses the lovely pinks of the RGB.. needs some Oiii I guess to bring them back. -
Nice one Steve... the 4 small spikes at 90 deg are from the KAF8300 camera. I get them with my KAF16200 although the other night I had multiple spikes as a spider had weaved a web across the dew shield
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Started back in late April and finished off early last week, the Tulip Nebula in Cygnus, accompanied by what is believed to be the shock wave from micro-quasar Cygnus X-1 in HaLum_HaR_OiiiG_OiiiB and SHO palettes. 10 hrs each Ha, Oiii and Sii and 3hrs each RGB, RGB and Ha captured with Esprit150/SX46 and Sii and Oiii captured with Esprit100/ASI1600mm. Processed in Pixinsight and Photoshop, Ha and Oiii added using blend mode lighten and Ha used as a light lum layer again using Photoshop. Thanks for looking Dave
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Excellent Mark, well done ! Dave
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Imaging with the Samyang 135mm f2
Laurin Dave replied to Uranium235's topic in Getting Started With Imaging
If I remember correctly back focus should be 44mm for a Canon fit 46.5 mm for a Nikon fit plus 1/3rd of any filter thickness you have between the lens and the sensor -
Did you use “fast” or “high quality” as the option in Mosaic by Coordinates? If the former then try the later.. and do it overnight as it’ll take a while also do the Ha, Oiii and Sii for each individual panel align correctly? If not then I suggest you register the subs using thin plate splines and distortion correction ..
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Corner Vignetting... Is that a backspacking issue?
Laurin Dave replied to JonCarleton's topic in Getting Started With Imaging
Looks like amp glow to me ... see this from ZWO What is Amp-glow and how do I manage it? | ZWO ASI (astronomy-imaging-camera.com) -
IKO - M81 & M82 LRGB+Ha - Processing Competition
Laurin Dave replied to Grant's topic in IKI Observatory
Here's my second go.. this time with enhanced IFN. I did this using a masked curve. The mask for the IFN was created using Pixinsight's MLTransform (which isolated the large IFN structures) and Starnet (which removed the star residuals), the galaxies were protected using masks generated with PI's GAME script (which allows you to draw ovals). Dave- 66 replies
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IKO - M81 & M82 LRGB+Ha - Processing Competition
Laurin Dave replied to Grant's topic in IKI Observatory
Here's my first go...... processed in Pixinsight and Photoshop. Background extraction and neutralisation, Photometric colour calibration, HSVrepair, ArcSinh and Histogram stretches on RGB, Deconvolution and Histogram stretch on Lum, Histogram stretch on Ha - all in PI, LAB col and Soft light saturation increase in PS, Ha added to Red using Blend mode lighten in PS, Luminance layered on in 5 iterations in PS, Local Histogram equalisation in PI then LHE and non LHE images combined in PS to enhance (although not by very much) the IFN, MLT sharpening in Pi and a slight curve lift in PS ...... and a lot of toing and froing Dave edited 18Aug - improved detail on Holmberg -
Very nice Alan.. I agree, the NSG script is great, as you say it makes gradient removal easier and also helps brings out faint details..
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DarkFrames Mount servicing - is he ill?
Laurin Dave replied to Steve Davies's topic in The Astro Lounge
He was busy on Instagram earlier today showing off his polishing skills .. -
Very nice Steve, lovely detail into the core
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From this weeks amazing weather: M20, M16, M17 and NGC6888
Laurin Dave replied to fwm891's topic in Imaging - Deep Sky
Lovely images, particularly like the Trifid.. which must be very low Dave -
Cable tidying up
Laurin Dave replied to bottletopburly's topic in Discussions - Scopes / Whole setups
I run a SX Ultrastar and DeepSkyDad autofocuser through the hub on my ASI2600mc with no issues... from there to the desktop pc though an active USB3 HTH Dave -
Brilliant Steve, well done! Dave
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I used this Current Local Time in London, England, United Kingdom (timeanddate.com)
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Hi Steve I used it once to grab this ISS crossing the Sun today at 10:28 - Observing - Solar - Stargazers Lounge As far as I could tell it was bang on time local time (ie BST as it was April), but just in case set the camera going 30s before.. Dave
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Can you solve this puzzle about background noise?
Laurin Dave replied to Lee_P's topic in Getting Started With Imaging
Have you measured the different stacks in Subframe Selector? It looks to me as if the longer integration time stacks are getting harder stretches, maybe put the same stretch on each stack and then compare, also what's happening to M81 and M82 are they gettng better?- 33 replies
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