Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

Barry-Wilson

Members
  • Content Count

    1,885
  • Joined

  • Last visited

  • Days Won

    5

Everything posted by Barry-Wilson

  1. As an update - potential overseas purchaser has pulled out due to some 'inconvenience'. So back for sale. I am happy to consider selling the scope without reducer if a purely visual user is interested - £975 for scope, rings and case. CS!
  2. I bought this scope secondhand at the beginning of the year (from Dave Jackson of Hitec Astro) with a view to observing more (as well as my normal imaging). I have had fabulous views of the moon, Jupiter and Saturn. However, I do not spend enough time using the scope and it does deserve to be used by an enthusiastic observer. There are many reviews of this scope often using the label "legendary", and the views I had were a delight and there are many experienced observers who are better able to remark than I on the beautiful optics. It comes complete with the original Lomo report and certificate. The optics are in great condition. The OTA has two cosmetic marks to the paint as can be seen in the images (there when I bought it), as to be expected for a scope nearly ten years old. Otherwise it is in very good order. It has a split OTA enabling bino viewer use and APM scope rings. The 2" FT focuser has held my small collection of eyepieces very well and also functioned perfectly with a reducer and heavy QSI683 ccd. I have a 25mm extension tube for the focuser which can be installed between the OTA adapter and focuser to lengthen the focuser travel should you need. It also comes with a storage and transport case which is in good working order. Complete package £1,100 plus postage: 1. APM Lomo 80/480mm F6 scope fitted with 2" FT focuser, complete with end cap, test certificate and report 2. Two APM tube rings 3. 25mm focuser extension tube (+£25) 4. Transport and storage case 5. TS 0.79x reducer (I found a flat field at metal back distance of 66/67mm); this turns the scope into an F4.8 fast imaging scope. See attached screenshot of single uncalibrated 600s luminance sub. (+£100) I have retained the very good cardboard box in which it was posted to me, so I am able to post the whole package securely, postage to be agreed at cost. Also happy for it to be collected. Payment by bank transfer is preferred. Happy to send more images if needed and to answer any specific queries via PM. Barry Images: :
  3. An excellent video Gav, very worthy of the praise in this thread and no doubt took may hours of hard work. Terrific
  4. Hi Steve I have been meaning to experiment with planetary imaging for some time and your Jupiter images using your WO FLT132 have given me the final encouragement - thank you! I have just bought a second hand ZWO ASI224MC as a low cost/risk entry. I am now just contemplating the TV 2.5x or 5x powermate along with an ADC, perhaps the ZWO one. I am favouring the 2.5x as a more versatile tool along with being conscious of sky and scope limits. From your experience which would you recommend? CS! Barry
  5. Your latest revision Rodd is very good, with some fine detail in the Ha jets emerging. Well done, good job! CS!
  6. Excellent Ian and I am so glad my new-ish tutorials are helping you gain confidence with PixInsight: it can only ever be a benefit to have processing options at your finger tips. I have more tutorials planned, one in progress - it is simply down to time at the keyboard and all of the other competing demands on one's time. CS!
  7. Congratulations Peter on a detailed image celebrating your first light ?, lots of delicate Ha jets evident along with the faint arc. I am looking forward to more images as you hoover up the photons.
  8. Great image Sam and not easy from busy urban skies ?.
  9. Very well done indeed Gav. Great capture and processing skills for the faint outer ring of stars. This really is a difficult target and you have executed it with aplomb ?. Your enthusiasm for our hobby shines through yoour write up and I am so pleased that the Mesu is performing for you.
  10. A really excellent image Maurice. I saw the same faint dust in a recent M64 I have imaged from home however did not have the best luminance or RGB data to lift it from the noise. The faint blue is there and you have the tiny detail in the core. Well done on a top image.
  11. Lovely result Olly. Very helpful timing to see your benchmark image as Steve and I have data on this target and hope to finish soon. Your idea of collecting Ha is sound too: a screenshot of a raw uncalibrated single 1200s is attached to whet your appetite. The Ha will really help lift the active HII regions. Overall Olly a really impressive image from the new dual setup.
  12. Very impressive result Ciaran and great write up - perseverance and 'rule' breaking can indeed pay dividends ?.
  13. Excellent image Olly and congratulations on your new double rig. Who'd have thought you had a spare TEC140 lying around? I am looking forward to seeing the emergence of some grand and deep projects ?.
  14. Hi Peter - even with deep wells you manage to make the processing seem effortless and the image does not look pushed at all. Lovely detail in the core with hints of the ejected Ha jets. Excellent work.
  15. Well done Thomas - definitely better detail within the galaxy, especially the core. Better colour balance overall too. I am sure your image could withstand some small tweaks in curves, "C" and "S", with a suitable mask to protect the stars and background. Maybe a touch of Exponential Transformation making sure lightness mask is ticked, say at 0.2 or 0.3.
  16. Well done Jose - a striking image with great interest. Have you tried adjusting each channel in the histogram to help with the background and also it might help the depth of colour in the nebula? I've just bookmarked your image on ABin - one for the 'to do' list!
  17. You have a super M101 Ceph. There are advantages with a bigger scope and dark skies. It does allow for far more patience when collecting data too. Thanks very much Carole. The extra data has really paid off; it's maybe not needed every time but has helped with this target. Glad you like it, thank you ?. Your comments are much appreciated Steve - thank you. Cheers Ciaran - it did almost process itself . . . Thanks Peter. Ha, ha - understood and have almost made that mistake myself ?. ?.
  18. What masks have you created before you might consider cropping the RGB? The first thing I do with my separate R, G and B windows is to combine them. Thereafter crop (and apply saved dynamic crop instance to Lum or NB channels as well) and onwards to DBE. You can then create any mask on either RGB or Lum and you do not need to crop them as the image windows are already cropped. A step saved and therefore possible sources of error. DBE will model the gradients across the combined RGB very efficiently if you chose good background samples. It can sometimes be an advantage to carrying out NR on the separate channels before combining, it really depends how noisy the data is. I would try carrying out NR after your combination as an experiment so you are preserving the maximum detail in the lum: with the number of subs you have I would have thought your data was relatively smooth. You only need to deconvolve the luminance channel. Good luck!
  19. Sorry if my reply above seems a little brusque, I'm just dashing about this evening trying to get jobs done ? ?.
  20. Thanks for that info. Re: colour calibration - you do carry out this step before stretching, from your original thread it's just that you mentioned it towards the end of the list. Modifications I would suggest from reading your screenshot of the PI processes (but I may guess the order incorrectly): 1. As you have seen, I wouldn't carry out the drizzle step. 2. Carry out SCNR after your RGB stretch in the non-linear stage. 3. Carry out your crop after RGB combination (just saves you some steps). 4. Carry out DBE on the combined RGB image rather than on separate channels (saves steps and you can properly see the colour gradients). 5. Do not use LRGB combination - it washes out the colour - CieLab combination with masks is the way to go. Please see my tutorials on basic LRGB workflow, including DeConvolution, here. 6. Definitely check your DeConv settings or reduce the iterations as you are creating artefacts (worms) and losing detail. 6. NR and sharpening after stretching in the non-linear stage. HTH - more techniques in my tutorials too.
  21. Hi Thomas If you are ok with feedback as you have requested, some questions arising in my mind:- I think you have a nice flat background sky and some good colour in your star field, neither of which appear over processed. I would hazard that your data contains more detail than the final image and that perhaps you sense this with your request for feedback? I wonder if you have lost detail in your image at your deconvolution as I see you have tell tale 'little worm' shapes. Combining your luminance with your RGB has left it washed out. Maybe incorrect NR settings have reduced detail in the galaxy too. Why did you decide to drizzle the luminance? Is your list of PI steps in the order that you processed? If so, there are certainly steps in the wrong order, eg colour calibration after linear stretching. What chronological workflow steps did you use? Is this image cropped? What is your native image scale with your kit? I'm happy to help with processing steps, just let me know. HTH
  22. Thanks Gav. Don't think I've ever processed a galaxy at such scale and frame filling before. Thank you Francis. Much appreciated Richard. Glad you like it ?. We decided to push out to 5 hours per RGB channel for this image and it certainly has helped, even above our 'normal' 4 hours per channel. Thank you Sean. Having clear consecutive nights is an obvious advantage in ability to go deep and also able to practise processing on your own data is invaluable. Cheers Dave. We have plenty of nights without cloud and very good seeing. When we get variable evenings (ie, say 10% thin high cloud) we tend to not image as we have sufficient confidence to know that the weather will improve in a day or two; this contrasts with the UK when you will often image in less than ideal because you never know when you might get a chance again. Neither do we push out imaging with the moon beyond 70-ish% for NB. SGP's planning tool is very helpful in setting criteria for multiple targets throughout an evening, making the most of mixing LRGB with NB data as they rise and transit. Planning and research is invaluable to make the most of the evening's plan ?.
  23. Excellent image Steve. No comments from me - top notch!
  24. I have imaged M101 a number of times from both my home observatory and now from both remote setups I share ownership and jointly operate with Steve Milne. We deliberatley chose to go deep this time aiming for as much detail as our optical system would allow, knowing that the galaxy is almost a frame filler for the Sony chip in the QSI690. I therefore submit this image as another example of the treatise setout by Olly, namely that a refractor teamed with a small pixel camera can produce excellent results formerly the preserve of long FL scopes with prior generations of camera technology. This image has a pixel scale of 0.75"/pixel and is the entire frame other than edge cropping from stacking/dithering. From Wikipedia: "M101 is a large galaxy, with a diameter of 170,000 light-years. By comparison, the Milky Way has a diameter of 258,000 light years. It has around a trillion stars, a twice the number in the Milky Way. It has a disk mass on the order of 100 billion solar masses, along with a small central bulge of about 3 billion solar masses. M101 has a high population of H II regions, many of which are very large and bright. H II regions usually accompany the enormous clouds of high density molecular hydrogen gas contracting under their own gravitational force where stars form. H II regions are ionized by large numbers of extremely bright and hot young stars; those in M101 are capable of creating hot superbubbles. In a 1990 study, 1264 H II regions were cataloged in the galaxy. Three are prominent enough to receive New General Catalogue numbers - NGC 5461, NGC 5462, and NGC 5471. M101 is asymmetrical due to the tidal forces from interactions with its companion galaxies. These gravitational interactions compress interstellar hydrogen gas, which then triggers strong star formation activity in M101's spiral arms that can be detected in ultraviolet images." Processing was a delight though a few of the larger stars required taming and PI trickery (the triplet oiled fluorite objective of the TEC140 does love big blue stars!). Steve's magnificent version is here. Details: TEC140 at F7 with flattener GM2000HPS II UP QSI690wsg-8 Astrodon filters Ha 20 x 1200s; Lum 65 x 600s; RGB 30 x 600s each channel; 32.5 hours total integration e-Eye, Spain Data acquisition: Barry Wilson & Steve Milne; mid-Feb to mid-March 2019. Processing: Barry Wilson SGP & PixInsight CS!
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.