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About Uranium235

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    Main Sequence
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    Worcestershire, UK
  1. Thanks Barry, I think running at ISO200 really helped with the star colour. I've had a little revisit to the data, and done a version slightly less saturated in star colour in red, then boosted in blue a little... the colour balance feels a little better now
  2. Yep, definitely overcooked the Ha there. You went down the right road in blending it with the red channel, but it probably needed a slight drop in opacity before flattening (with photoshop blend mode = lighten). All you need really is for it to be sparkly bits
  3. Lewis, that lens should be at the top of your list mate as being able to run @ f2 without issues is no mean feat!
  4. lol... thanks Olly, just what I always wanted That patch of Ha... Im pretty sure its Sh2-133, Maybe not worth chasing since its just a long(ish) ribbon of Ha.
  5. heh heh While I was there I tweaked the background a little bit to help remove a bit more of the chromatic noise you get from a DSLR... just picked a bit of background which isnt dust and did a slight desaturation on a very narrow colour selection. Also clipped the black point a little more, so theres about a gap of 20 before the histogram starts - which feels about right. Actually, more luminance might be nice to really clean it up becuase while I was at the dark site the only L filter I had was a CCD CLS - which felt like a lot of overkill. But yesterday I finally got my hands on a nice UV/IR cut, so next time Im out chasing dark stuff there wont be a single photon wasted.
  6. @swag72 there ya go! Managed to dig up a really old Iris from SGL8 and used a bit of registar magic to layer it in
  7. Thanks Sara, I've got a bit of an idea in regard to the Iris colour. Im pretty sure I did it a few years ago with the Atik 314, I'll check the PC a bit later to see if I can find the data.
  8. The stars have already been reduced to death on this one it was a bit of trial and error on the luminance layer to find the point just before dark halos start to creep in. The dust that has colour is what was in the CCD luminance, so no need to check it really.... including that odd streak of Ha towards the top right of the frame.
  9. Well.... if I had a brain I'd be dangerous! Went out the dark site again last night and this time forgot my dew heater cable.... doh! So, after a quick rummage around in the car I found some cardboard and sellotape - then made a very rough looking dew shield for the Samyang lens. It did the job, but I lost a bit of time becuase on that so only just over 90min worth of colour DSLR data collected before I had to pack up as I was getting pretty tired.... oh boy did I pay for it at work today, stumbled around in zombie mode the whole time! More colour data would have been better to work with, but I went with what I had. The main thing I would have liked more of is better colour in the Iris itself, but the dust and star colour seem alright (messing around with LAB colour). Whether I chase for more colour im still deciding... but I definitely wont be doing it on a week night again! The added DSLR data amounted to 35x180s @ ISO200. So tonight, Im off to sleep until my name changes to Rik Van Winkle! EDIT: Now updated with old data for Iris colour:
  10. Yayy... dark site tonite! Better wrap up warm!

    1. Alien 13

      Alien 13

      Is this another outing for the mighty Samyang...

    2. Uranium235


      Yep, with the DSLR this time - trying to in-fill some colour on the Iris CCD data.

  11. PM'ed mate
  12. I guess for now you could take it out and do some daylight photography, the only issue being that you will need a tripod/monpod and do the focusing via liveview to nail the focus - but that does rely on your subject staying still for a few moments (not always possible!) I made the silly error of not checking my focus properly for the first sub of the night, one quick inspection of the first sub showed that I was a fair bit off - so a couple of tweaks later and the show was back on the road.
  13. Out at the dark site again last night, this time NOT forgetting my counterweight and tripod leg spreader! Now up to four hours @f2 with the 135mm lens, which has helped with the noise in those really faint patches of dust. Also, I've had a good go at keeping the starfield down - which is easier said than done when most of the background is stars! It might be worth me trying straton or something similar and incorporate that into the Scott Rosen workflow, but whether that would kill off detail... I dont know until I try it. Once its complete, it might be a good candidate as data for the advanced Ps workshop at the next SGL meet, I'll post two versions - just so you get the picture (pardon the pun!). 24x600 (L) Samyang 135mm @f2, Atik 383L+, NEQ6 Thanks for looking First, version using standard curves, levels, and moderate star reduction: As you can see.... too many stars, not enough dust! New method to be used at the workshop: Now... much smaller stars, and much more dust. The two bright patches either side at the top of the frame are from bright stars just off the FOV.
  14. Just a few from me, as my 200 hasnt been used as much as it should have since i got the 135mm f2 lens: