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Droogie 2001

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Everything posted by Droogie 2001

  1. Here is my second submission to the competition. After previously trying to image the Heart Nebula in Broadband it was great to get a chance to have a go in Narrowband. Image details are: Scope: William Optics Star 71 Mount: Celestron AVX Camera: Moravian G2-8300 – Mono Filter: Chroma Ha 3nm 18x1500s exposures (7.5 hours) at -25c 30x Flats & BIAS (SuperBIAS) Imaged over August and October 2017 Processed in PixInsight & Photoshop Thanks for looking.
  2. Glad to hear you got it solved. Is my video showing the exact same issue you were having? My flowerpot adapter shows heavy scoring inside but not sure if that is just because yours is newer? It is odd that from new yours is doing this, clearly a design flaw and not great for a new mount. Maybe worth keeping and eye on as understandably the issue plays havok with your tracking.
  3. This sounds very much like the issue I have / had. When I first got the mount the issue was not present but then one evening it started occuring for no apparent reason. If I rotate the DEC head the counterweight bar / weight would not rotate at the same rate meaning they would be left off centre. I have included the video below that I sent to Celestron to demonstrate the issue, is this what you are experiencing? After many different ideas with the vendor it went back to Celestron. They could not see the problem and low and behold when I got it back the issue was still there... Tried different counterweight shafts and different 'Black Collars' (AKA Flowerpots). I can see a scoring inside the flowerpot so it seems to be rubbing on this. The only way I solved this was to remove the collar (flowerpot) as my mount is well out of warranty, its not needed and is simply there for cosmetic reasons. Not something you want to hear on a brand new mount I suspect? I would suggest arranging a replacment if it is brand new as I have never found a solution to this... AVX_DEC_FAULT.mov
  4. Lovely image. If you are interested the Astro Imaging Channel most recent session was on this very target. I watched it last night, you may find some useful tips.
  5. Nice dramatic shots of the 1st stage coming back down, sparks and flame everywhere. Watching the speedo both acceleration and deceleration is fairly eyewatering, not sure I would want to be onboard! This landing business is becoming routine...
  6. Also watched S@N last night. Enjoyed it too. I think going to the Moon is a sensible step towards planning a future Mars mission. As mentioned in the show it is much closer to Earth and we have been there before so have some previous experience. My only gripe is that there always seems to be an imminent launch which never seems to happen. Is it the Google X prize that keeps getting delayed? Appreciate that this is still a hugely challenging task on relatively small budgets but I want to see some landers!
  7. I purchased a WO Star 71 (Version1) a while back which was and still is my only refractor. The 5 element APO design, requiring no field flatener means I have not had any issues with chromatic colour aberation and have pin sharp stars to the corners. Not suggesting that cheaper models cannot do this but when I went to purchase a refractor I was willing to accept paying extra to not have to deal with these possible issues. Overall its very made and has been a pleasure to use.
  8. Thanks for that will have a look at ebay.
  9. Thanks for the tips. I have a modded Canon 1100d with a Samyang 16mm F2.0. Where did you get the dew heater from? I have one for my 50mm Guidescope so potentially could use this but need a means of powering it..
  10. Thanks for the confirmation. Shame as the preview window looks better than when applied to the whole image. Still I understand the reasons why. Good to know about deconvolution too.
  11. Wow, another gorgeous image Rodd!
  12. Hmm. May have the answer thanks to Harry Astro Shed. It only works properly on a whole image...not previews Odd that I have not noticed this before! http://www.harrysastroshed.com/pixinsight/pixinsight video html/pixinsighthomenewbie.html
  13. I am getting a very odd and unexpected result when running the HDRMultiScale Transform process in Pixinsight. After starting to rework some of my old data I noticed that after a lot of careful previewing the effects of my HDR process differs on a preview window then it does when run upon the main image. On the below image, the right hand side is a preview window and produces my desired result. However the left hand image is the result (zoomed in) of the same HDR Transform settings upon the whole image, clearly there is a large difference. Nothing has changed with the setting and the mask is the same. I am literally running the same process on the main image. I have ensured that I have not inadvertently somehow running the process twice or duplicating a step. Is this an expected result as it is calculating the entire image as opposed to data on a small Preview window, this does not sound logical at all? Many Thanks
  14. Thanks for the ideas and links. I feel a bit more prepared now, just hope I see the Aurora.
  15. I am going to Iceland for a short break in the next few months so I thought I would have a go at imaging the Aurora. I have an Astro Modified Canon 1100D so my first question is whether I need to switch the White Balance settings to colour correct for daylight photos? This is something I do should I wish take terrestial photos during day time. Normally when taking images of the Milky Way or DSO’s I want to use the enhanced sensitivity to infrared but not sure if this will be desirable for the Aurora? Secondly, I will be using a Samyang 16mm F2 lens so what sort of exposure, ISO and Focal ratio should I be looking at? I am considering 10-15 Secs F4 @ ISO800 as a starting point, the moon will not be a factor. Appreciate some of this will be trial and error but I would like to at least have made some preparations beforehand. Of course, this is all based on whether I am lucky enough to see the Aurora. Thanks.
  16. Stunning image. I can really see a bat or an owl within the nebula!
  17. You don't need darks. You map them from RAW lights. At least I am doing this, though I am trending unfamiliar waters...
  18. You may not want to be using Darks with your Moravian G2-8300 (I have one) as per my current thread, something to consider...
  19. I am currently experimenting on a PixInsight rerun with a BPM rather than dark frames. The BPM list took a while but I think I have 95% of the troublesome blighters. My data set is quite small (3.5 hours) so perhaps not an ideal test but compared to the image I created with the Dark Frames included then there is definitely no increase in noise, whether there is less is hard to say. The main issue I am having is that every time I rework an image I improve upon the previous version which whilst nice is not helpful when trying to make comparisons! I originally assumed that darks were required as that seemed to be preferred method when processing data that wasn't say a Sony CCD chip, useful to know that this is not necessarily the case. At least this may help stop me having to keep building Dark Librarys.
  20. Having had a bad experience earlier this year I had to resort to bin liners! There was a massive 20min down pour from no where which came about after I had set all of my imaging kit up. Luckliy said bin liners did a good one off job and no damage done. I like John's suggestions as this covers the entire mount, tripod and all. I have lots of things velcro'd to my tripod legs so this is an important consideration as well.
  21. Liked the Norton reference that gave me a chuckle! Hmm. Will take a look at BPM's, though I use PI for my calibration etc so will need to figure out where it goes. Sara: Very intertested to hear that you do not use darks with your KAF8300, apologies for the assumption. SGL is great for looking for an answer on one topic only to find that there maybe a half dozen better answers! Thanks all.
  22. Not sure how to subract the average BIAS level from each pixel in the frame? Apologies if I missing something here? I think I will probably run a test stack without darks and see what results I get. I realise I would need to look at Olly's suggestion re defect maps as well. I don't mind creating Dark frames but I definitely want to avoid adding noise. I am using the KAF-8300 chip in my CCD which is prone to noise? I think Sara uses one of these so I know from her images that she has good control over noise levels when Darks are used.
  23. Thanks for the thoughts Olly. - Have you considered not using darks at all? On our Kodak cameras we use a master bias as a dark along with a defect map and a hot pixel filter in the stacking. I find this generally works better than using darks, sometimes much better. I have not really entered the realm of defect maps and hot pixel filtering so I have not looked at this avenue. Its a case of I have heard of it but shied away from it... I will have to carry out some reading and research on the topic. - I'd expect that a small number of darks, of whatever length, would risk doing more harm than good. Totally agree. - Do you need to do 30 minute darks if stacking in PI? I know little about this but won't it optimize a different dark based on the master bias? Not 100% on this. The master BIAS or in my case the Super BIAS I create in PI does not touch on any of the Dark frame creation? Thanks
  24. Certainly makes sense as the greater number of files will help average out the dark noise I guess?
  25. Thanks for the speedy response Sara. Phew that works out at 12.5 hours of Dark exposures. I guess I cant blame the weather when creating these but I am going to need to up my previous estimate. Certainly 25 frames roughly matches up with my current 24 frames for 10mins darks.
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