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Everything posted by Merlin66

  1. LBN is Lynds Bright Nebula. This is a standard catalogue in CdC. Just go to "Catalogue/ CdC deep sky" tab and tick the Lynds Bright Nebulae box and the field of view numbers you require.
  2. PM sent. A couple of images - showing the front objective, the side view of the black box and the assembled eyepiece holder would help.
  3. Carole, On my HEQ5 I find a telescope load of 10Kg is close to the limit...the weight of the counterweights is not usually considered in the load capacity of a mount. Re extensions... I use the extension on the NEQ6 to give me a bit more height on the pier. It works well, no major issues. The mount holds a C11 +spectroscope+ four cameras+ electronic finder etc. all up about 17Kg (and five counterweights!!) Ken
  4. I used the Lx200 12” OTA for many years, but it weighed in at 17+Kg. eventually changed to the C11 on a NEQ6 mount.
  5. It's been a long time since I used it, but if I remember correctly a stop watch was used to time the star across the field of view ""- Use a timer to measure the time in sec needed to entirely cross the screen at the eyepiece or camera level,"" HTH
  6. Yes, The artificial star movement is tracked by your mount and shows the interaction of (in my case) PHD and the mount. You will still need "in real life" to get pretty good PA alignment and do a successful calibration. But it's good practise when cloudy.
  7. Yes, I've successfully used SGE (http://sweiller.free.fr/SGE/SGE-star-guiding-emulator.htm) I have the guide I used attached. Have a look then if you have problems let me know. Ken Star-Guiding-Emulator V1.0 Manual.rtf
  8. I'm of the opinion that when we started to "get serious" about CCD astro-imaging PS was about the only game in town. It built up a reputation based on the early successes and was adopted by the amateurs as being the "package of choice". you weren't "doing it right" unless you used PS and/or some of the add-ons developed by the astronomy community. It was never a dedicated astro package - it was for use by serious photographers and professionals. As the years went buy it changed both in content and complexity to better meet the market needs of the professional. Most of the needs of the amateur astronomer continued to be met by the older versions, but it was still held up as "package of choice". Nowadays there are more and more photographic processing packages available and newer astro dedicated software which have been developed to meet the needs of the amateur astronomer. I can't see how the average Jo Blow can justify the current costs of PS compared with capable alternatives. We seldom use it every day, and there's little or no commercial benefits in using PS. What was cost effective and useful twenty years ago is now an over featured, over priced package and should no longer be held in high esteem as the "only package of choice" Just my 2c
  9. Vlaiv, The grating dispersion is non-linear with wavelength, but usually so small it can be ignored. Robin's given you some useful answers. I'd just use what you have and see how the results pan out.
  10. My rule of thumb for solar imaging is focal ratio =x5 pixel size. Usually work around f25.
  11. Note also that the Meade Series 5000 x3 Extender is very similar to the ES and is telecentric design.
  12. The Herschel wedge with a ND3 filter is considered safe for all apertures. Addition filters - Continuum may improve the contrast.
  13. Hmmm... OK, I think your saying the end of the drawtube has a 56mm thread. This is where the 2" adaptor screws onto the drawtube? All the 10:1 focusers I have came from "other" ED scopes, so I'm not sure what the thread is on a generic GSO type focuser......
  14. What about this: https://www.ebay.com.au/i/123328294840?chn=ps
  15. John, Thanks for that. Always good to be corrected! Bang per buck I find it hard to go past a good ED doublet.....
  16. John, My SW ED80's are the older "Champagne" ED80 pro model. I think the newer "Black Diamond" versions us the Schott FPL 53 glass.
  17. Vlaiv, I use three ED80 scopes, I believe using FPL-51 glass. I don't see purple fringing and I'm not sure what the FPL-53 adds other than smart marketing. To achieve "APO" performance you need the corrections applied to three optical elements, a doublet can only be a compromise.
  18. Michael, I use three ED80's and I've converted them all to 10:1 focusers plus added a SW motor using a timing belt drive. I assume if the reducer screws onto the extisting focuser then it would also screw onto the replacement. ( I don't use one so can't confirm) Look for a 96mm fitment 10:1 Crayford.
  19. Robin's put you on the right path..... Check out our website for additional detail: http://www.astronomicalspectroscopy.com/
  20. Peter, Based on my twenty odd years of solar observing and the extensive use of the Baader solar film, it's most unusual to get pinholes - the material is coated on both sides so the pinhole would have to be on both and align. (I keep my filters in a dust proof container when not in use) If a pinhole is found, it's not the end of the world. The increase in light reduces contrast and causes glare, certainly not a cause of eye damage. The pinhole can be covered by Typex or black marking pen - and life continues. It's of more concern to always have the filter securely fastened to the scope. Check, check again then do a final check.......
  21. Many of us on numerous occasions have pointed out the unsafe nature of these filters....and still they continue.
  22. Interesting... I can't seem to find any reviews/ experience with this new Celestron focuser - or any vendor offering them. I used the Vegemite lid, larger knob option on the C9.25/ C11 for many years then adapted a SW motor as a belt drive...changed to the micro focuser on the C9.25 - absolutely great! On the C11 I now use the JMI focus motor and the computer control. Works very well for me and meets my spectroscopic needs.
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