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nigelbeaumont

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About nigelbeaumont

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    Star Forming

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    North East England
  1. First light with my nice new 130PDS (and first image after almost 2 months of rain and wind and clouds.....). Keeping it simple for its first outing, so 25 x 120 seconds with Canon 450D, aligned and stacked with Nebulosity and then levels, stretching and curve tweaking in Photoshop CS2. Pleased with the result, although looking at the other images I have a lot to learn...
  2. Just finished an evening of narrowband imaging of the Crescent Nebula using an MGEN to guide - looking through the images, I've noticed that the guiding is OK for the first hour or so, but the later images begin to show signs of star trailing (all the subs have the same duration). Any idea whether dew would cause this effect? I was using dew heaters for the first time on both the imaging and guiding scope, but looking at the main scope objective, there was still a little dew on one edge (forgot to check the guider). What might be other causes, could heat from the dew tape create a pocket of warm air in the dew shield that would affect the guider seeing?
  3. I've put a 1mm thick PTFE washer between the tripod and mount. Even with the bolt between the two cranked up tight the mount moves very smoothly when turning the azimuth bolts - I found the washer made it noticeably easier to get Polaris in the polarscope circle
  4. Well, I've redone the image in two further palettes. The first one is the HOS palette (Red = H alpha, Green = OIII and Blue = SII), and the second is HOO (so SII not used, which is not such a loss given there isn't very much SII in the Dumbell Nebula). Not sure which one I like most - the HOS one is closest to my DSLR image of M27 from the previous night, but the HOO image slightly edges it for me
  5. Well this is the end result. I'm quite pleased with it as my first narrowband image from my CCD. I've used the Hubble palette, might go back later and experiment with a different one. Looking at the pixel count, 10 minutes is clearly far too little exposure per sub, however I'm impressed how little colour noise there is even after a strong stretch (especially in SII). I used Photohop CS2 and followed Starizona's guide to clipping adjustment layers - haven't tried anything beyond tweaking levels and curves for each of the three layers and then a final tweak with the colour balance
  6. Well the sequence has completed - not really enough data, but it was more of a shakedown run to see if everything worked together, and it did. Subs look OK at first glance, stars dont look elongated so tracking seems to have worked. Will try processing tomorrow evening to see what I captured
  7. Stacked 6 x 17 MB SUBs today with drizzle turned off, and the output file was 71 MB. Still big, but a whole lot more manageable than 300 MB (only stacked 6 because the other 14 were lost to broken low cloud and horrible dew, worst I've ever had)
  8. Wish me luck - doing my very first narrowband imaging with my new mono CCD. Chose the Dumbell Nebula, as I imaged it last night with my DSLR so I can compare the two images. Night is very clear, and the light breeze is keeping the dew away - last night was horribly dewy, I lost the last few SUBs due to the secondary dewing up
  9. I'v turned off drizzle x 2 and will see if that has an effect on output file size. No idea when I turned it, but probably a while ago
  10. I still used it in DSS with median kappa-sigma clipping to stack the images, and it disappeared on the final stacked image (a total of 17 SUBs)
  11. Had a look on Heavens Above, and I think it must be an old Kosmos rocket - there are several that pass through Cepheus at about the right time and date
  12. I normally wait until the start of astronomical dark to start imaging, which is about 2200 at the moment where I live. However could I start earlier in the evening if I'm narrowband imaging, say about 2100? It would gain me an extra hour at a sensible weekday time for the longer NB subs
  13. OK, that would make sense - not seen anything like it before, so was curious. Wonder what its orbit is, since the north celestial pole is off to the left and the local altitude was about 80 degrees
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