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About bobro

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    Proto Star

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    Isle of Wight
  1. When playing Pacman (long ago!), the monsters always caught me quickly and I didn't do well. Nothing has changed - forecast was very good but continuous clouds and a very strange gremlin happened where the camera disconnected and reconnected, only to take jpegs instead of the required raw images. Then capturing paused on its own whilst I was indoors! The result : just a single raw 5 min sub at ISO1600. Here's my attempt at processing it. Next time I will beat the monsters!
  2. bobro

    Image Stacking alignment

    Yes it can. For example 'Intersection Mode' in Deep Sky Stacker.
  3. bobro

    Image Stacking alignment

    Stacking software is pretty clever - it can detect and cope with rotation (even 180 degrees) and align the images correctly. Another stacking software function is cropping - to the common intersection of the individual subs if required.
  4. bobro

    Best Canon camera on a budget

    It would be interesting to know what you wish to image and what equipment has been purchased - might help with camera advice.
  5. bobro

    Weird Noise

    A bit of reverse stretching and lowering saturation shows the image better. You've captured good star colours and there isn't much noise. Focus is perhaps a little soft. At f#5.6 an exposure time of 4 min is ok for the Horsehead but too long for M42 - to start with an exposure time of approx 1 minute may be more appropriate, even less for the very bright core. Depends on the ISO you are using - 800 is commonly used with Canon cameras.
  6. bobro

    Going To GoTo (Probably)

    Slightly embarrassed to say, though my setup hasn't been running that long it does use CdC, SharpCap, EQmod, APT,PHD2 and AstroEQ - and I can't remember how I set everything up as it just works! Imaging setup consists of using SharpCap for polar alignment followed by slewing to a bright star not too far from the target for more accurate goto alignment using CdC. APT works well controlling the mount for dithered images. I can't comment on using a handset as I've never had one. PC is a battery powered netbook with a USB powered hub as there's not enough USB ports on the netbook. Presumably everyone to their own setup that works for them. Could be a problem if I have to change something ..... can't quite remember how it goes together
  7. bobro

    M15 against the odds

    Great to see such small stars on a cluster. Focus and guiding must have been spot on!
  8. bobro

    First imaging session

    Nice scope purchase! The stars show the scope will make for very good images. Pleiades is a great target to start out with - your image should show good improvement in detail with flats added.
  9. bobro

    A Tail Of Two Horses

    The QHY8L, with its large pixels, seems a good choice for DSS imaging. My f#8 150PL needs time to capture images, so I looked into what camera could be a more sensitive alternative. The QHY8L and ASI 294MC seem suitable OSC possibilities, though different technologies.
  10. Great start with the new setup under a very bright Moon - will be much better when the Moon is gone. The images show a mix of trailing (perhaps mount settling down), focus (not quite spot-on) and coma. Coma can be fixed with a corrector. Focus at less cost with a Bahtinov mask (can be a DIY effort). Trailing depends on the equipment balance and setup - presumably the EQ3 is tracked but not guided? Great polar alignment, whilst important, is only crucial for longer exposures - perhaps best to just go for whatever interests you as that is useful for gaining experience. Having said that, the 20 sec image of Mizar looks spot-on with just a bit of coma.
  11. bobro

    Process Veil Again

    There's great detail in the image just waiting to become more obvious. Without knowing how the image was captured, there seems an obvious way forward - more subs!
  12. bobro


    Love the star colours! Though I'm a bit puzzled by the exposure - isn't Lum supposed to be longer than RGB to capture detail as our eyes aren't that sensitive to colour?
  13. bobro

    A Tail Of Two Horses

    Certainly, not many steps. Using GIMP, select : Filters - Blur - Selective Gaussian Blur (I used something like blur radius 18, max delta 0.08). Then use Colors - Curves to brighten up the red nebula. The same thing can be done once the image is decomposed into RGB (Colors-components-decompose (RGB - decompose to layers)), allowing a different degree of blurring for each colour, before recomposing again. I also did a bit of star rounding/shrinking by duplicating the image, setting the top layer blending mode to 'Darken only' and them moving the top layer slightly. The nebulosity below the horse doesn't need blurring, so it could be copied from the original.
  14. bobro

    A Tail Of Two Horses

    An acquaintance who uses Photoshop on a regular basis produced better results with my images than my efforts using GIMP. To try and match his efforts I tested out GIMP's offerings and found that 'Selective Gaussian Blur' is useful for enhancing nebula depth and reducing noise. Here is my effort on the Horsehead : original from about a year ago soon after I took delivery of my 150PL, plus today's reprocess using Selective Gaussian Blur. There's no end to this AP learning journey...
  15. Wow - that is a big file to download! A 20MP camera image? I did give it a go with my limited processing abilities. The image is red - a modified camera? My resulting effort doesn't provide a lot - looks like some sort of central brightness rather than the NAN. Others who are better at processing will do doubt do better. It would help to know exposure time, # exposures and more about the equipment.

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