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Merlin66

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    http://www.astronomicalspectroscopy.com

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  • Gender
    Male
  • Interests
    Spectroscopy, Solar observing,- and my wife!
  • Location
    Junortoun, Vic, Australia

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  1. The serial number is just a guide. A better question to ask would be - does the front objective look "blue" or "brown/ gold"
  2. Don, I have a late five element 4000 no eyecap made in Japan, recessed barrel circa 1990.
  3. Let me see if I can help.... The Series 40000 super plossls are "Ok" eyepieces BUT they come in two flavours. The original design was a five element design said to be based on the mythical Masuyama five element design. These are collectables. They are marked JAPAN on the barrel, and do NOT have rubber eye caps and were manufactured prior to about 1996 by KOWA. The early Kowa versions were smooth barrels but the later versions circa 1994? were undercut. The rest were made in China and changed back to four element design to save $$$$$ ???? which was pretty "basic" Hope that helps. Ken (I have a remaining sample of the five element design from1995. I did have a full set of Masuyama eyepieces (!!!!) which I sold to buy Ha solar filters.)
  4. With the TSO my C11/NEQ6 was covered by a dust sheet and in winter after an observing session I draped a 12v heated doggie blanket over to reduce dewing. It’s done well for almost ten years.
  5. The objective lens was a 2” spectacle lens blank, 1 diopter ( 1 metre focal length).
  6. A photo of the set up would help. usually it’s possible to slide the OTA in the rings to allow the focuser to clear the rail.
  7. Nicolas, I thought the HD version had the mirror lock screws to prevent movement?
  8. The slop can be reduced by running the mirror up and down the baffle - about thirty turns of the focus knob. This redistributes the grease and reduces the gap between the mirror sled and the baffle. Doing this every month or so definitely improves the situation. works for both Celestron and Meade SCTs.
  9. Even with a rear crayford etc, the mirror is not fully restrained and can still flop.
  10. You can use the Auxiliary mount option to allow RA/Dec feedback from the mount.
  11. The filter can fail within months, or years......... No guarantees.
  12. It's associated with the construction of the filter, the glass is hygroscopic, similar to the older photometric green V filters. https://glassfab.com/wp-content/uploads/2015/08/schott_filter_catalog.pdf (see sect 5.5)
  13. I’ve been using PHD2 with ST4 connections with my NEQ6/ C11 combo for many years. It’s not necessary to recalibrate between targets if it’s set up correctly.
  14. Pretty good, mate! Looks like dust bunnies on the RHS - probably on the camera cover plate?
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