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Merlin66

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Everything posted by Merlin66

  1. The Herschel wedge with a ND3 filter is considered safe for all apertures. Addition filters - Continuum may improve the contrast.
  2. 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......
  3. What about this: https://www.ebay.com.au/i/123328294840?chn=ps
  4. John, Thanks for that. Always good to be corrected! Bang per buck I find it hard to go past a good ED doublet.....
  5. 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.
  6. 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.
  7. 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.
  8. Robin's put you on the right path..... Check out our website for additional detail: http://www.astronomicalspectroscopy.com/
  9. 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.......
  10. Many of us on numerous occasions have pointed out the unsafe nature of these filters....and still they continue.
  11. 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.
  12. I think PhotoShop is a great piece of software. Well recognised and respected by the user base. If I were a professional photographer whose livelihood and income depended on my results, then renting PS would be a real option. For the "average" amateur astronomer looking to improve the processing of his/ her images I think the costs of PS are very difficult to justify. There are many dedicated AP programs available which are more cost effective and I'm sure can meet our needs.
  13. The QHY should be "plug and play"..... Just ensure you have all the necessary drivers installed.
  14. You can still follow the PA alignment process in the older (non subscription) V2.9 SharpCap.
  15. Just to add to the confusion..... Some years ago I tried a double stacked PST etalon concept ( two PST etalons back to back in a PST Stage 2 mod) I found it very very difficult to tune and gave up....... Now almost ten years later this concept is being re-visited....the "trick" this time is to redesign the PST to PST adaptor to allow better rotational orientation between them and the addition of a "backwards facing" CPL between the etalons - which can be independently rotated to control the ghosting.
  16. Most (=all) of the Quark users I see on Solar Chat forum use the Quark straight through. I only get NR with the ASI 174 on my H alpha solar set-up and need a T2 tilter, not the other cameras.
  17. I think, over exposed image and reflections....
  18. Mick, have a serious look at the latest PaintShopPro - it gives PS a run for it's money! You can download a free trial - try before you buy - no annual fees! https://www.paintshoppro.com/en/products/paintshop-pro/standard/?sourceid=psp2019
  19. Anthony, There a solar tracking site which will accurately show when noon occurs. https://www.suncalc.org/ Just enter your location.....
  20. James, To save space, I went for a sliding door ........
  21. My first log dates back to 1963.........
  22. Yes, that is correct. V2.9 is still available.
  23. Merlin66

    LDN 1622

    Rodd, Easy way to check... Click on the "About" properties, if it says: "Information from Lynd's catalogue of dark nebulae" then it's using the ldn if it says "Information from catalogue SAC" then it's using the alternative Barnard designation from the SAC V8.1 catalogue.
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