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Found 7 results

  1. Slowly dabbling with narrow band and the processing that is becoming more like art than science I really am enjoying it though, Imaged this in my red zone back garden last night, it's 10 x 300 secs each of Ha Oiii and Sii ( no darks as they looked weird ) Thanks for looking / feedback. DSS - Photoshop levels / curves - gradient xterminator - photoshop channel combine as per @swag72 tutorial - photoshop levels to balance colours to my taste - slight noise and star size reduction (Noels tools)
  2. Thought I would share my first attempt at the Pacman Nebula (NGC281) using some Badder Narrow band filters in my Atik One 6.0 / Esprit 120ED. Over two nights, I first took 12 x 10 minutes guided shots at 1x1 binned with both the Ha and OIII filter (i.e., 4 hours total exposure) and put them together using PI with Ha mapped to red and OIII to both Green and Blue. This gave this image:- On the following night I then took 12 x 10 minutes guided shots at 1x1 binned with the SII filter. I then put all the shots together using PI, this time with SII to red, Ha to green and OIII to blue (6 hours total exposure). This gave this image:- I think for the bicolour one, I have over stretched it a bit, which I do not like, and although I prefer the tricolour, I can not help but think that it should be red rather than green, which is of course what is going to happen if Ha is mapped to green rather than red?? All comments, particuarly critical ones on how I could improve things (I have a very think skin) welcomed. DDS
  3. Hi, What can you do during a rainy and boring day? Yes, write something about about old project ideas that newer have been realized. For many years I have been wondering how to construct a beam splitter system to make more efficient use of exposure time when doing color or narrow band imaging. I have today written down my ideas here: http://astrofriend.eu/astronomy/projects/project-high-efficiency-narrow-band-imaging/project-high-efficiency-narrow-band-imaging.html There are a lot of interesting links there too to read. /Lars
  4. Hi clever people (and fellow geeks), I live in London and I mostly do narrowband imaging from my roof. I have a 2005 tele vue NP-101. Its an F5.4 super apo. Its a great scope and it cost (with a few other bits) around £1800. Question: Would I be wise to sell it and instead buy a tele vue genesis? The Genesis isn't a super apo but I'm thinking that doesn't really matter for narrowband imaging and at f5 it is a bit faster which will help. As it is a petzval design I'm assuming it will have a nice flat field. I can get one for around £600... and I could use the money I've saved to buy pixinsight and other bits of astro kit. wotdoyathink?
  5. Like most fortunate enough to be able to image through the clear nights of the past week I captured some of the best data of my time in this hobby. I focussed on IC 1396 and the Elephant Trunk nebula imaging it in both narrow band and LRGB I posted my first effort on this object after an hour of data in each channel of Ha, Oiii and Sii. This final process contains 2 hours in each channel / bias-flat-darks / processed in PixInsight with no tools used except HistogramTransformation, CurvesTransformation and SCNR...no noise reduction. I'm going to process a bi-colour example then move on to the data I captured on the Wizard Nebula :-) These are very low resolution screenshots - full resolution can be seen on my website. David
  6. I see a significant price difference between the Baader and the Astronomik filters, has anyone compared recent H-alpha/beta, O-III, S-II filters from the two brands? Astronomik claims higher transmission, but like to see if that's true. Question is also if a 10-15% difference in transmission justifies an almost 2x higher price tag? (Looking it the other way around: the price of a 12nm Astronomik H-a almost buys me a 3.5nm Baader piece, which would allow me to make use of full-moon nights, which, according to Murphy, are usually the only clear nights for multiple months around here). So far from the charts Astronomik seems to be better, however this post says otherwise: behind higher transmission values of the Astronomik filters there is a higher tolerance against undesired parts of the spectrum. Apart Baader & Astronomik: are there <5nm O-III and H-beta filters around? Astronomik offers only a 12nm piece for H-Beta and the Baader is 8.5nm FWHM with around 75% transmission, there is some potential here...
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