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rharrison

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About rharrison

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    Nebula

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  • Location
    UK, Essex
  1. Great thread, had pretty much the same questions as Julian. 3.2 micron pixels is very small for a dslr isn't it?
  2. Very cool subject, didn't someone else image this the other day I'm sure I saw another thread Nice to see something a bit unusual very interesting.
  3. 30 to 40 min subs with 4m focal length would have to be one hell of a mount! Would my 200mm f4.5 newt be better... more light grasp ?
  4. I would have thought a C14 might be a tad slow. No hope with my Ed80
  5. Amazing stuff, would a big fast reflector be best for this kind of challenge ?
  6. Should have mentioned, I don't have narrowband filters I'm using an unmodified dslr with a baader light pollution filter. M13 is unfortunately behind my house for too long, M3 looks like a possibility thanks Any area around ursa major is good.
  7. Hello, I have a very obstructed horizon and lots of light pollution, I've been working on M81 and M82 for the past few months. I'm reasonably happy with the quality of the guided subs I can get now. Any suggestions for a DSO nice and high all night for a beginner with a 1200d and an ED80 to learn on
  8. Thanks, sorry just a couple questions, so to get the data obviously connect the camera and mount in PHD. Do I have to do looping exposures ? do the calibration ? Select a star? Or just literally connect camera and mount and check the 'log' option on tools. Couldn't find a tutorial or anything.
  9. Thanks Chris At the risk of sounding like a moron what data would it record if it's not guiding ?
  10. Fascinating, I might have to try and have a go at imaging this.
  11. Thanks, yeah it's amazing what you can do from a built up area especially narrowband but that's a whole load more expense, I'm planning to stick with the DSLR for a while yet.
  12. Thanks looks like you've got a similar setup, I used the Eq5 motors, annoying when the clutches undo themselves.
  13. Couldn't agree more. Amazing picture, the fact that this kind of image is even possible still amazes me.
  14. I find M82 a fascinating target, an incredibly active galaxy, the polar bursts look amazing in Hydrogen Alpha and I've managed the record a lot of red data in that area with my camera. Unfortunately no new supernova ! Apparently all this 'starburst' activity is due to immanent collision with M81. This image is around 19hrs total exposure with a modest setup by the standards of this forum. A finder guided Vixen GP2, a cheap 102mm Bresser refractor F6 lots of CA and a Canon 1200d unmodified with a 2" Baader light pollution filter and Skywatcher field flattener. A range of exposures some of the early subs were 1min unguided, the later ones 300secs when there was no moon, all taken from my heavily light polluted garden in the center of Southend over the last few months. I used Bias and Flat frames, no darks as I'm of the opinion they're almost pointless unless you can control the sensor temperature, My enthusiasm for the challenge of Astrophotography is growing! and I've since upgraded to an NEQ6 and a Vixen ED81.
  15. I bought this - http://www.firstlightoptics.com/coma-correctors/baader-mpcc.html Works perfectly with my Orion optics f4.5 newtonian nice stars to the edge of the field with my 1200d
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