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About trev27

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  • Interests
    Photography, Astrophotography, and all things geek
  • Location
    Galway, Ireland
  1. @groberts. If you set "Auto-Str L" on on the historgram window in apt you should see the rosette in a few seconds - I think it was appearing in 3 or 4 seconds for me with this camera at F5 or so.
  2. They're my gotos for PixInsight stuff as well. The pre-processing workflow on lightvortex is brilliant. Would have been totally lost otherwise.
  3. I was wondering that also. It seems like a bit of overkill to be sure. I'll try my next set without dark on the flats.
  4. Easy target I know but I'm pretty surprised again by how much detail can be pulled in so quickly. The ASI1600 was set to a gain of 200 and offset of 35. 30x60s in each HA and OIII 30x10s in each for the trap area. Nebulas was hovering around 30 degrees over the city lights. Bright target so I got to use short exposures this time. Megrez 90 doublet and ASI1600MM Trev
  5. Hi Ken, I believe that the darks are scaled when calibrated to the flats. e.g. I've actually been using a 30 second master dark (bias calibrated) on all of my flats as that was the shortest dark frame I had captured. The results seemed pretty good. Trev
  6. Turns out it was just one that slipped through the net. New one on the way soon.
  7. Thanks guys, I suspected as much. I got it from a retailer on special a couple of months ago. I'll check with them now - could be that it was old stock. Many thanks, Trevor
  8. Hi all, I purchased a Baader 8.5mm OIII filter to go along with my HA and RGB set. The other filters work as expected but I'm getting very large halos on bright stars across the field even on short exposures. Looks like reflections to me? Have seen the same happen on my 66mm and 90mm refractors using both a William Optics .8 FF/FR and the excellent Hotech flattener. Cam used was an ASI1600MM. Two examples attached. I had heard halos were common on bright stars, but usually on faster FRs. These shots were at F6.9 however. Should one expect this much haloing? Trev
  9. Amazing isn't it? Coming from a DSLR I can't quite believe how much signal gets picked up. And the smaller chip is way more forgiving than the full frame cam on my refraftor. I am finding the whole monochrome imaging a challenge though. Learning time!
  10. Thanks Gina. Makes sense. Yep, 139 is unity. Higher isn't necessarily better though - low noise at 70. I've seen alot of the CN guys using that setting.
  11. Uber fanstastic. Thanks for sharing Gina. I've been planning the same shot with a Canon 135 F2 once I get my adaptor. Not sure my Baader HA will handle that speed so may try it from a dark site with RGB filters as I have no idea how to get my IDAS into the optical train.
  12. Ditto to that! Flo are excellent - fast shipping and great service Been playing around with mine as well. Arrived mid-June and we've had a whopping 10 hours or so of clear sky spread over nights. Sadly most subs taken were messed up by passing clouds. One thing I've found necessary was to purchase a eyepiece anti-dew band. At -15C I've found that after around 1.5 hours the front window will fog up due to the moisture in the air in the extension between the filter wheel and the window. Have seen this reported by someone on CN also. Haven't received the band yet but it should work. It's been an odd summer over here with a relative humidity hovering over 90%-95% on those nights. Luckily I managed to pick up a Digifire 10 for a good price. Gina, I see you are trying -25C - have you found much benefit noise-wise compared to a higher temp. Here's one attempt. Unity gain, guided with phd, captured with APT and processed with PI and the latest PS CC. 180 second subs in HA and OII. Could not get RGB info before the clouds came in. I think it was 8xHA and 7xOIII. Surprised this much information came out. Forgive the star colours, so much still to learn in PixInsight! Megrez 90FD with the Hotech flattener. Have found this combination much much better than when using the William Optics .8x FF/FR (horribly distored stars). Trev
  13. That is fantastic Jokehoba. Loving this camera as well.
  14. Hi Andy, I wouldn't be the best judge of glow as I'm coming from a DSLR, but here's a dark stretched strongly in PI. A bit to the left and two brighter areas top-right and bottom-right. This is at 180 seconds, gain 139 (unity) and offset 21 @ -15C. Once I get some lights at those values I will be in a better position to see how well it will calibrate out. Trev
  15. Interesting. I had expected them to update the way the chamber opens, had not expected the USB hub. I've received my ASI1600MM from FLO, but we've only had a couple of hours of clear sky over here in Galway. Did manage to get it out for a quick test on NGC6960 on the Megrez 90 and was pretty astounded at how much more usable data I got than on, say, the 5D MkIII. Big step up from a DSLR. Great to be able to cool to a set point. It really is a nice high quality device. Well pleased with it. Trev
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