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About prusling

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    Star Forming

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  1. prusling

    Happy Christmas Dorset Stargazers

    Happy New Year! Looking good, Louise - was that with a 200mm lens? Did you manage to get to BR? I was outside on Thursday during the clear periods imaging the Pacman Nebula but missed last night - there seemed to be some high cloud in Poole? Hope you have enough material to process and look forward to you sharing the results. Hope to see you and others on Tuesday.
  2. prusling

    Astro clear out (9 items for sale)

    Pm incoming re focal reducer
  3. prusling

    Happy Christmas Dorset Stargazers

    Cheers, Ade. Best wishes for Xmas and New Year to you and all the members - here's hoping for many clear skies and observing sessions in 2019 and an opportunity to meet new locals!
  4. Thanks, Kev, your 100 degree 20mm Myriad on the 250px was a revelation - closest I have come to naturally looking through a window to the universe!
  5. Thanks to @AdeKing, @kev100 and @Grumpy Martian for your great company last evening. Despite the early cloud, chilly wind and bright Moon it was nevertheless very enjoyable! Imaging was very hit and miss but I managed to pick the best 34 of the 60 1-minute frames I took of the NE Milky Way region without any calibration frames and put this heavily cropped image together with DSS and StarTools. Capella to the lower left and the Pleiades to the lower right with the California Nebula between them, double cluster middle left with the Heart and Soul Nebulae to their left, and of course the Andromeda Galaxy to the upper right. Looking forward to the next get together!
  6. Hi, I plan to be there and will be bringing my DSLR/SkyTracker. Look forward to meeting you all!
  7. https://www.portsmouth.co.uk/news/politics/street-lights-to-be-turned-off-at-night-across-hampshire-1-8688439 We need to lobby for this in Dorset as well! I've copied it to the Street Lighting team at Poole council.
  8. Sorry I can't make it either - beer festival at lunchtime...!
  9. prusling

    Star discovery clutch adjustment

    A brief update - post-adjustment the tracking is still not great but probably better than before. Gotos are OK and the mount is less prone to accidental manual movements although as noted there is a fair bit of play before real movement. Will persist with it for now, but underwhelmed...
  10. prusling

    Altair hypercam 183c

    It is very dark. It's the stretch that is moving the very dark pixels up to brighter levels so you can see them. You have a mean/median pixel value of around 656 out of a possible 64k. That represents the unwanted signal from the electronics that needs to be subtracted from the pixel values to give you the real signal.
  11. prusling

    Altair hypercam 183c

    Looks good to me, though it depends on what you are doing - i.e. whether you need more gain or not. e.g. if you are taking long exposure images of DSOs it's probably fine but if you are wanting to live stack lots of short exposures you'd need to wind up the gain (in my limited experience!).
  12. prusling

    Altair hypercam 183c

    You're welcome, I may not live far from you so I'll drop you a pm. I believe that the latest APT beta has native support for Altair cameras (rather than ASCOM) though you may want to check with Ivo the product owner. There's also a good facebook group for Altair products if you haven't already found it.
  13. prusling

    Altair hypercam 183c

    Fuzzy grey is good for bias and dark frames as it shows the signal that is present. Other software won't stretch them as much and you'll just see black but that won't really tell you anything. Sorry I can't add anything more to the gain query - what software are you using and someone else may be able to help?
  14. prusling

    Altair hypercam 183c

    There are a number of programs that can view and manipulate FITS files - the ones I use are FITS Liberator 3 (ESA/ESO/NASA basic image stats), Fitswork 4 (a number of useful functions), IrfanView (a lite photo processor that can convert TIF to JPG for sharing) and GIMP (full-functioned photo editor). All are free or donation. Most will not show colour (unless a debayering function is used). Bias files (and darks) have extremely low pixel values so will display as black unless stretched a lot. My main personal recommendation would be StarTools which is an excellent post-processing program that is very reasonably priced - there's a free trial as well which disables saving.

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