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bdlbug

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About bdlbug

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    Star Forming

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    Northampton
  1. Agree with David, my recent experience with imaging B33 with Baader Ha (7nm) The marked difference in two sessions with Alnitak halo and ASI1600 microlensing definitely demonstrates a dependence on accurate focus, spacing between FF/FR and the orientation of the filter. I got improved results by accident as I had worked out I needed to reduce the Riccardi F/R back focus spacing by about 1-2mm into to eliminate some elongation in stars at corner of images, however when I re-assembled the optical train I put the filter wheel on 'backwards' and the difference is below. There is still microlensing in both images, that can be cosmetically improved in PS, as per Olly's comment above, but the large Halo which is very difficult to remove in any post processing is significantly reduced. So I would definitely suggest to OP, @Miguel1983 , if it is possible to reverse the orientation of EFW and re-run a Ha session on B33 and compare. I am using a AT106EDT, Triplet APO Before modifying back focus and initial Filter wheel orientation After changing FF/FR spacing and reversing filter wheel orientation Bryan
  2. ....and after a meridian flip, the clouds roll in - so packed up for the night, off to process my 34 Ha subs...
  3. Clear here in southNorthants for now Pod protecting me from chill wind , guiding doing ok around 1” pulling in Ha from the horse been adjusting F/R spacing and seems to be giving me much better shaped stars - know more once processed
  4. Started to get into projects using a Baader Ha(7nm) filter on the ASI1600. The clear nights I got over last weekend were an unexpected bonus, but with the moon making its presence known , so imaging was always going to be Ha. M42 is just under 3.5hrs of integration from last Friday night Horsehead and Flame just over 4hrs integration time from Monday evening and addition subs from December last year Both images use120s subs at unity gain. I used various levels of stretching on M42 image that I then used in a ridiculous number of masked layers in PS to compress the high dynamic range in M42. I also used quite a bit of artistic license on the Horsehead and Flame with Alnitak to reduce halo and micro-lensing from the ASI1600 CMOS sensor. Processing used APP to stack and integrate then mostly Photoshop to process but I did experiment with PI and used StarNet++ to work out how to stretch the gaseous stuff and not bloat the stars.....not sure that was entirely a success. I also did a Ha wide field of Orion and belt a couple of years ago using Samyang 135mm that I added a mosaic tile to that brought in a bit of Barnards Loop - added that to give perspective on the closeup images. My plan is to build on the mosaic when Orion comes back in the Autumn , I know its not gone completely yet, but by 9pm its past meridian and lost in tall hedges... I do have a rather outrageous colour image of M42, I am hesitant to post up as I used it as an experiment to combine all my DSLR and ASI1600 versions and maximise what I had..... here's a thumbnail, let me know if you would like a full resolution version posted... M42 Great Orion Nebula Horsehead Nebula (Barnard 33) and Flame Nebula (NGC 2024) in Orion SH2-276 Barnards Loop, M42 Orion nebula & Horsehead & Flame nebula
  5. Mick, appreciate the feedback, I also thought that the red was intense, but my daughter thought it looked impactful - it's probably the result of me being a bit heavy handed in blending Ha with Lum to highlight the Ha detail (I think I read should be <15%, I may have doubled that !) - I know how would anyone think do do such a thing however I used blend mode lighten for main overlay of Ha into the LRGB. @carastro has a cone image posted up as well and also had a couple of variations on how to balance the saturation of red. I actually prefer Carole's framing as her image has captured more of the dark molecular cloud below the cone, in her image, I managed to miss most of that above the cone in my framing. I 'll perhaps have another processing session later this evening and see what's possible.. Bryan
  6. Thank Adrian, yes definitely imaging in Ha delivers depth that’s not apparent in RGB which does support the discussion I had with Ian King at IAS in that LRGB images in light polluted skies is difficult to achieve consistent and quality results but going narrowband opens up a whole new universe however I prefer broadband images and I’m yet to embrace narrowband ‘style’ or invest in the additional two filters..... Bryan
  7. @astro mick I’m intrigued why you initially thought ..Oops Bryan
  8. All, like many posts last weekend was first imaging opportunity since beginning of December. Given the poor and very damp weather I brought everything in from the observatory in December, so last Friday, with prospect of a decent few days of clear sky I set it all back up again. Like a lot of things in this hobby, it didn't quite go to plan -but I did get polar aligned and a few test images on Friday night before cloud rolled in. Saturday was an evening of frustration as my mount was not behaving, grabbed two subs on he cone and then clouds. We didn't do as well for clear skies as I had hoped for in Northants over the weekend as the cloud just seemed to arrive mid evening. Anyway Monday was the night......Started early got set up and started imaging about 6:30pm, took dogs out for their walk, came back into the obsy about an hour later only to find everything dead - muppet here had forgotten to plug laptop into power socket, so everything had crashed and APT lost all its settings, hopefully no-one overheard my choice words - so complete reset of APT settings ( I've now saved a backup..) and got back imaging about 8:30pm through to nearly 3am. Details 66 subs Ha(7nm) 120s : 2.2hrs 30 subs each LRGB 120s : 4hrs ASI1600MM (-20degC) AT106EDT + Riccardi 0.75x FF/R Processed APP, PS I'm posting the Ha(7nm) Baader as well as the combined LRGBHa - I think they both give a different perspective of this region of the sky. 6hrs on this is target is not really enough, so my processing has pushed things and so noise as usual is the enemy, so a bit of NR applied via masks etc.. Thanks for looking Bryan
  9. love the name, its such a foreboding presence, I think a Lord of the Rings name is very fitting For me 5hrs on this target is just the very start, its really very dim and difficult from our UK back gardens, You're right to think more subs needed - I reckon you need double the sub time and probably more with a DSLR as I imaged NGC1333 recently with a dedicated CMOS camera, ASI1600, and had over 10hrs of capture and had to remove over half as luminosity just gets over whelmed by light pollution from my back garden. Massive step up from the 2016 version - another session on this target in 2022 then
  10. Stu, myself and Mrs bug are doing exactly the same we are off to London tomorrow to see a show then Sunday down to Maritime museum to both these exhibitions thanks the tip about National Rail 2for1, just printed off my vouchers
  11. Brian, that's come out rather well, despite your misgivings about the sub quality - congrats Bryan
  12. Brian I just posted up last night my attempt at NGC1333 , it’s not an easy target in LRGB from UK back gardens. My subs looked really rubbish and even after integration the image needed to be really stretched and noise reduced and detail squeezed out. I have just revisited luminance for this target tonight as the skies are very good and bonus on Sunday the school pitch floodlight are off all evening as no 5 aside brings me up to over 10hrs on this target now - most I’ve ever collected, and dumped as the luminance is really tricky, at leat that’s my experience. Best of luck with your attempt at NGC1333 in LRGB Bryan
  13. A stunning image of the reflection Nebula NGC1333 was posted by @ollypenrice back in October and it inspired me to image the same target from my back garden just outside Northampton. Well it’s not easy : Despite the lack of clear skies in past 6 weeks I have managed to get about 8 hrs of subs over 3 nights - but all luminance discarded as the integration was so noisy and mostly a collage of white. Last night was again plagued by low level mist/fog but I got 3hrs in before I gave up. I used the RGB from late October mixed with RGB subs from last night that I integrated in APP to create a super luminance. I have then spent most of today and many iterations teasing the last bits of useable signal out all of the channels with PI and PS and actions - Thanks to Olly and his technique to enhance the molecular cloud structure using the equalise function in PS doubt I can remember how it all came together but I believe I have got a recognisable image of NGC1333. Captured using ASI1600MM in 120s subs and AT106EDT There’s probably about 5hrs of data in this version of the image . thanks Bryan
  14. Almost a year ago I captured an image of M33 and at the time used the new IDAS D2 light pollution filter. This week, Wednesday 2nd I got out and captured 3 hrs of subs, 1hr Ha(7nm) and 2hr RGB , but I removed the D2 filter from the light path. I processed the data using Astro Pixel Processor and Photoshop CC2019 then added the luminance layer from last year's session. Result is below. My personal opinion is that I have got more colour in the stars than the image I took last year through D2 - may be I am improving my processing skills, but I suspect trying to capture RGB behind a D2 filter attenuates the RGB signal and the result is less than satisfactory. Captured using120s subs with ASi1600 running at -20degC and unity gain behind AT106EDT on AZEQ6GT thanks for looking Bryan The original M33 topic from October 2018 can be read here
  15. There are quite a few excellent milkyway images being posted at the moment and I particularly like that we get views of the milkyway not only from UK but from members posting from locations all over the world and also when we UK astronomy types holiday abroad and can get some astro kit packed under the radar into the luggage - I managed to convince my better half that I simply must have my tripod and ball head along with the very important wide angle lens, despite the fact we were on a safari and the 500mm zoom was the default lens. Anyway, it was a holiday of firsts, first time in Africa, first time south of the equator and first time in such dark dark skies. I had heard that the Milkyway core could cast shadows - I thought that was urban myth - nope - its incredibly bright when you are under truly dark skies. So below is my image, consisting of around twenty 20s unguided images using unmodified Cannon 600D with Samyang 14mm lens at ISO3200. I used Microsoft ICE to stitch all the images together then Photoshop to warp into a 'flat' image and then further processing to reduce noise and increase saturation. The image was taken from a location called Miramboi, a tented lodge between Tarangire National park and Lake Manyara, about 3 deg south of equator. There are a few clouds in the image, and my impromptu mosaic plan left a few gaps hence the 'triangle artifact ' bottom center of image...... next time, if there every is a next time, the Star Adventurer will get packed !!!! Bryan
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