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almcl

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About almcl

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    Star Forming

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    Male
  • Location
    Telford, Shropshire
  1. Three telescopes = one HST image

    Thanks, I'll have to have a detailed look at that. (Going from 910mm to 200 may not be sensible but could be interesting.)
  2. Three telescopes = one HST image

    Awesome image, thanks for sharing! Which stacking software do you use to get the different scales to match up?
  3. Think so, but it's been a while since I last used it. Perhaps best thing is try it and see? The ap can also be used for daytime photography, of course...
  4. Yes, it can. The documentation isn't all that clear, but I ran multiple exposures of anything up to 10 minutes using my Android tablet (the 10 inch screen at 10x magnification was handy for getting focus, when I didn't yet have a Bahtinov mask). Had a thread here which gives a quick version of how to do it.
  5. If you have a tablet there are aps that allow you to change settings, set intervals, delays, alter ISO &c and to adjust focus on the tablet screen (much easier than using the screen on the back of the DSLR). One such ap for Canon DSLRs is DSLR controller https://dslrcontroller.com/ Alternatively, the free version of Astro Photography Tool runs on a laptop and will allow control of the camera and a lot more besides.
  6. If you down load the Polar finder app (http://myastroimages.com/Polar_FinderScope_by_Jason_Dale/polar204.zip) and substitute the reticule image in the distribution folder with this one reticule.bmp you should be able to work out where to put Polaris.
  7. New Zealand Astronomy

    We're off to NZ next week for a holiday. While there we are going to try Big Sky Start gazing on Mount Cook. No idea how this will turn out and, only being there for one night, the chances of a clear skies are not great, but will report on return.
  8. Polar aligning an ALT AZ EQ6

    Thanks, Wim. Glad to know it's not just me! I've tried the offset technique you describe, also smaller and smaller 'untighten-shift-retighten' increments but probably down to operator ham fistedness these aren't always repeatable, although on some days we get down to less than 5' PA error, others it can be 15 or more.
  9. Polar aligning an ALT AZ EQ6

    Thanks, Freddie, yes I have considered some grease or possibly a slip ring cut from a large milk container (got these in several places, now) between the tripod and the mount base... Might have to try this.
  10. Polar aligning an ALT AZ EQ6

    Sorry if my description wasn't clear, I am not slackening the clutches (honest!) but rather the fork tightening knobs (as per the SW instructions): and the primary locking shaft (the one that clamps the mount to the tripod). With it tight the azimuth adjustment knobs (arrowed in red below) struggle to change orientation : The 'new' reticule makes any movement pretty obvious, but tightening the locking shaft frequently produces movements like that of the two black dots here:
  11. Been using my ALT AZ EQ6 for some months now and love the belt driven quiet movement and, when well polar aligned, the guiding accuracy is pretty good, too. One thing however is a problem. To adjust the position when polar aligning (has to be done every session as I have no permanent set up) I find it necessary to undo the clamps, so that polaris can be moved to the appropriate point on the circles (new style SW reticule). So far, so good. The problem that now rears its head is that tightening the clamps moves polaris out of the carefully set position, sometimes by quite monumental amounts. This is most noticeable when tightening the primary locking shaft, which absolutely has to be slackened or the AZ adjustment bolts don’t achieve anything. Not sure if this is a ‘feature’ or if something is wrong with my mount assembly, but would like to know if anyone else suffers the same issue? Or better still has overcome it?
  12. Halos on Astronomik Ccd clip

    Not entirely sure of the ground here, nor of what you have in the imaging train, but I have found it is quite difficult to get the red and blue at the same focus point, once the Canon IR blocking filter is removed. One suggestion I've read is to concentrate on focusing the red as sharply as possible (may not be where the Bahtinov says it ought to be) and accept that a slight blue halo may result, the theory apparently being that a blue halo is less intrusive than a red one?
  13. What is this? Can I buy one? Can I make one?

    There's a web site which gives details of how someone made one here: http://www.astro-images.de/miscellaneous/misc_sun.html In German and the translate function in my copy of chrome leaves a bit to be desired but the essentials are there...
  14. Using ASPS and APT together

    Thanks for that! I'l give that a go next clear night (might be a while, we've just had 4 in a row).
  15. Started using All Sky Plate Solver recently (thanks to Steppenwolf for the heads-up on that) and it's working really well. Discovered its compatibility with Astro Photography Tool (which I've also recently started with). Finding both very good but having difficulty getting my head round the multiplicity of functions they can perform together and wondering if the community has any thoughts to share on how to achieve the following. I want to use a sub from a previous night, already solved, and get the Pointcraft or GoTo function in APT to position the scope back on the target, in a similar position to the earlier sub. Pretty sure this ought to be simple and possibly automatic, but somehow, when at the scope, in the dark, I can't find the right buttons to click in Pointcraft or get confused by GoTo and GoTo++ or find the scope repositions itself to somewhere entirely different. If someone has a foolproof check list, that would be fantastic but any pointers would be welcome.
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