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MartinB

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About MartinB

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    www.astralpeaks.com

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    Chesterfield, Derbyshire
  1. Is your middle picture an LRGB then, it can't be a luminance image? I can make it work with an LRGB image although it does blur my galaxy a little
  2. I must be on the wrong wavelength here completely. You can't have "no blend mode" except for the background layer. The default is "normal" which would effectively block the background. I suspect I'm missing something very obvious here!!
  3. Thank Clarin. I think I must be doing something wrong here (not at unusual). So a star obliterated colour image at the bottom. A luminance on top of this - What are you using as the blend mode for this layer?
  4. I'm a bit confused. If the starless layer is at the bottom i.e. the background image you can't set a blend mode. Is the starless image on top of the background image?
  5. Outstanding work Claran. Your commitment and attention to the details of all stages of the imaging process is really delivering results.
  6. ASI1600mm cool

    Sorry this is a lazy post in that I haven't gone through all 40 pages and I'm sure the answers are in there! I'm planning on buying the mono version of this camera and am looking at the flo bundle with 36mm ZWO filters and the EFW7. I would also want to add the OAG. Is anyone using this set up who might have some advice or experience? Any views on the ZWO filters? Is anyone using the camera with maxim? Am I right in thinking it will be an ascom driver? Any help or advice much appreciated
  7. Full frame canon body worth it??

    This isn't my experience using a FF 6d and an APS 80d. In terms of noise they appear very similar in real world use at night. The 6d is mainly used for night time landscapes using samyang 24 and 14mm lenses. The 80D also gets used at night but is a much more agile camera for happy snappy daytime use. I can use a Tokina 11-16mm (this lens is designed for APS chips and wont illuminate ff) at 11mm with my 80d which gets around the issue of a smaller sensor as far as FOV goes. Two advantages of APS cameras - lenses are generally cheaper and for the same field of view you use a shorter focal length lens which gives you a greater depth of field with easier focusing. Having said all that, my 6d is my weapon of choice at night because it pairs beautifully with the Samyangs
  8. I bought this camera new 5 years ago and it has been very little used. The sale includes the sx off axis guider. Camera and OAG £600 All in excellent condition. The front of the camera body has some cosmetic scratches from use of the OAG - see photo. Collect from Chesterfield or add £20 for insured special delivery postage Payment by bank transfer I've attached a couple of images taken with the camera along with pics of the camera itself
  9. What CCD for GSO RC 10?

    The result of the onward drive to higher pixel counts is that typical pixel size has come down significantly. This is great for short focal length fracs but they can also work well with longer f/l scopes like yours thanks to binning. This will effectively double your pixel size whilst reducing your read noise and increasing your dynamic range.
  10. I guess PHD is looking at the saturation level of the guide star. A saturated guidestar is a very poor choice since an accurate centroid can no longer be calculated. Also if the brightness is moving beyond the linear response of the chip, accuracy will be reduced. So I think it is a case of brighter being better until brighter gets worse!!
  11. That's a beauty Nigel, well done
  12. Exactly. Rather than a pin point the light levels from a star form a distribuation curve which allows the calculation of a "centroid" hence sub arc second guiding from a short focal length scope
  13. Orion in the water

    Superb and thanks for the Sequator tip.
  14. Another key to good guiding is having a good guide star. The star needs to be as bright as possible, up to the point where the response of the chip ceases to be non linear. Having a shorter length imaging scope greatly improves your chances of finding such a star. You've already discovered that, even with a short focal length scope, your guiding is often "seeing limited". There's no way of getting around this, short of active optics, but turning down the guiding aggression can stop things getting a whole lot worse.
  15. I bought this camera new 5 years ago and it has been very little used. The sale includes the sx off axis guider with additional option of a Lodestar 1 guide cam (goes perfectly with the OAG). Camera and OAG £800 Camera, OAG, Lodestar £950 Lodestar separate to above £200. All in excellent condition. The front of the camera body has some cosmetic scratches from use of the OAG - see photo. The OAG uses set screws to position the guide camera and the off axis prism. These show the usual set screw indentations. Collect from Chesterfield or add £20 for insured special delivery postage Payment by bank transfer I've attached a couple of images taken with the camera along with pics of the camera itself
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