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alacant

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Everything posted by alacant

  1. alacant
    Hi. OK, hang the camera on the laser then. If the beam stays put, you're fine.
  2. alacant
    Hi. I think you have to be more systematic. Again, JTOL, things you can try whilst it's still cloudy: Does the collimation change as you tilt the telescope tube? Does the collimation change if you hang a weight the equivalent of your camera on the Cheshire? Is the primary fixed in its cell or does it float from side to side? Does the primary have strong enough springs to hold it for ap? Is the secondary correctly aligned for twist and tilt? Does the secondary move when the tube is tilted? Is the secondary spider centred in the tube? Does the collimation show the correct offset whilst looking through the Cheshire? HTH.
  3. alacant
    Hi. I think so and/or tilt although it doesn't show the FWOABW light leak I mentioned. Maybe just my inadequate processing. Here's the master flat showing the tilt... HTH.
  4. alacant
    Hi. How does -the stretched- master flat frame look? That may help us diagnose moon or not...
  5. alacant
    Here's a quick look at your stack with StarTools in big-hammer mode There is colour... I think the main problem is gonna be the gradient bottom left to top right and what could be a light leak top centre. Certainly doable though HTH.
  6. alacant
    Amazing. Just imagine if you took 2 and stacked them. Almost twice as good; take loadsa snaps, stack them and see how the image improves. HTH.
  7. alacant
    Everyone say's I'm crazy: AP with a 6" f8 on a rusty old eq6? But hey, you can snap the ring nebula without having to put an arrow showing where it is!
  8. alacant
    Hi. ic5067 nebulosa del pelicano. HTH.
  9. alacant
    Moon again. Last night of this sort of deep sky stuff for a week or so. Oh, and that awful halo-ridden aliexpress cc... 3 minute snaps with 700d.
  10. alacant
    Hi. No. Leave the polarscope tight. Rotate the RA axis to the 6 o'clock position. That is when Polaris is at the top of it's orbit. Clamp RA. Now rotate the RA scale to whatever time Polaris transits. E.g. today at Alicante, Polaris alicante Location: W 0°38'00.0", N38°00'00.0", 0m (Longitude referred to Greenwich meridian) Time Zone: 2h 00m east of Greenwich Date Rise Az. Transit Alt. (Zone) h m ° h m ° 2017 Jul 01 (Sat) ***** *** 10:17 39N Then, when you're ready to align, rotate the RA to the current time and adjust alt-az to put Polaris in the small circle when looking through the guidescope **EDIT: polarscope. HTH.
  11. alacant
    Hi. Nice shots. JTOL; I wonder for the earthshine it would be possible to scale both shots and then layer them? It may make an interesting shot.
  12. alacant
    I've run out of excuses. Maybe we should have a tick list for each post: cloud, rain, cold, hot, hazy, owl, time, tracking, filter... So how about it was hot, dark, late, sticky and noisy. Not had those for a long time. But seriously, any comments here most gratefully received. TIA and for looking. 24x150s.
  13. alacant
    With turbulence over the southern horizon rife, the 700d sensor at 38º and the smoke from the San Juan fires, it was StarTools' superb deconvolution to the rescue. There's noise but it's bearable, as isn't the chromatic aberration from the cheepo cc making it look like it's been taken with an expensive refractor;) Thanks for looking and cool clear nights.
  14. alacant
    I'd guess the latter needs extra inward focus. Also, the swcc needs an extra 11mm of inward focus -compared with the focus position without cc- pulling the focus tube even further into the light path. HTH.
  15. alacant
    Apart from using a GSO coma corrector -which spoils the nice wide field- the only solution I found. HTH.
  16. alacant
    error: sorry
  17. alacant
    I cut off the whole of the end of the cylinder. The disadvantage with my method is that I've now only got around 15mm of focus left before the end of the draw tube disengages with the roller mechanism. I suppose if I did ever want to look through it, I'd have to use a 2" (variable?) extension tube.
  18. alacant
    I think it's because the lens is collecting light from a much larger area but concentrating it onto the same size sensor.
  19. alacant
    Hi. I'm -almost- convinced that comparing f# between optics of different aperture is misleading. Surely, a 150mm mirror collects more light than a 50mm diameter lens? Or maybe the latter collects more light because it grabs it from a larger area, hence the lens is brighter. Ahgghh, not this again!
  20. alacant
    Nice shot. It makes my Markarian's Chain look decidedly both star- and colour- less. *I think there ought to be an official end to galaxy season. I propose 1st. June... **What does Baader modified mean?
  21. alacant
    I think I've got the coma under control and the stars less like refractor blobs. This is with 53mm spacing to the sensor. Still a bit of tilt, but the adjusters around the focuser give me hope. Getting there. Thanks for looking...
  22. alacant
    Hi. Yes, thanks. That looks about right. According to APT's PointCraft: Without cc = 648mm Wth cc = 588mm Some magnify, some reduce. Others like the one for my f3.9, leave the fl intact. I've never seen the point in having a wide field telescope and using a cc which narrowed the fov. Whatever ccs are, they're way overpriced by the time the middlemen have taken their cut(s)!
  23. alacant
    Hi. Excellent shots. I like this one. Probably because my brain is telling me that's what it should look like rather than pushing the boundaries. I'm the one which needs to adjust. Thanks.
  24. alacant
    Hi. OK, thanks. That makes me feel a little better:) Getting there slowly... Is this image taken with a 150PL? Is 150PL this? Is this similar? TIA.
  25. alacant
    No, no. Not you, I. I should read the thread. The acronyms beat me every time. 150L this 130P that, EQ5, NEQ, WO7... I just wanted to know how you got the shot. It doesn't matter to me if it was a 130 or not; I love the experimental side to astro photography. TIA.
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