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Everything posted by Merlin66

  1. Coincidently I'm reading Agnes Clerke's " Popular History of Astronomy in the 19th Century". On page 142 she notes the discovery observation of the sixth star in the trapezium, by Sir John Herschel using James South's 12" refractor on the evening of the 13th February 1830.
  2. While doing supernovae seaching with 12" f5 newt I could get down to 15.5 mag. The trick is to use enough magnification to give a dark background..... controlled breathing and start with averted vision.... A 16" should easily show these stars.
  3. I use the HEQPro5 with V3 and I've never found anything re collision avoidance....just have to take care! Karlo: With a german equatorial mount (GEM) the telescope tube can be to the West of the pier/ tripod when your tracking an object in the East. As the object gets closer to the meridian ( ie due south) the eyepiece end of the telescope gets closer and closer to the pier/ tripod, eventually it would hit the mounting, so to avoid this happening the whole scope is slewed/ moved so that the tube is on the opposite side ie East side of the pier/ tripod and observations can continue. This is call the "meridian flip" Hope this helps.
  4. The Canon 350D has a 15mm x 22.5mm chip, with a 27mm diagonal.
  5. Andy, Very good. It's amazing what can be achieved with a PST. Mark, With a webcam and a x2 or x3 Barlow you should be able to achieve similar. I've just upgraded from a PST to an SM60 system; looking forward to these clouds going somewhere else!!
  6. Good shot! Well done. Re. RGB alignment.... are you separating the channels for processing then re-combining? Why? This may be easier with PaintShopPro/ Photoshop??? If the images are unchanged in dimension ie no cropping etc then they should drop back on top of each other, if you know what I mean. More info required.
  7. Sorry Guys, I was looking for some of the shots I had taken with the 12" LX200, Optec 0.5 and the Canon 350D combo. Unfortunately they must be back in Oz. From my notes, which I do have, there was some edge vignetting but nowhere as much as I recorded with the meade 0.63. I also noted that the field "looked tighter and less distortion at the edges" With the Starlight MX7c both reducers worked well. What I should do, weather permitting is to take a few images back to back.....
  8. Most of the Ha filters for deep sky imaging have a band width of 7nm and above. To feel the effects of the cosmic redshift we're generally talking in terms of 0.001nm shift. Even then, it would only affect distant faint galaxies. Not an issue for amateurs. Re imaging during the moonlight.. the Ha makes a great light pollution filter and most of the background light, including the moonlight is suppressed, thereby allowing observing/ imaging in Ha.
  9. Thanks guys... I was actually hoping it had a 2" focuser like the ED80, and a bit more travel, like the Vixen A80Mf...... Back to the drawing board...
  10. Can't find the install files on my computer. But you'll definately need the .exe file and probably the source.tar.qz. I thought the CdC site had an explanation of which files were what. Worse case download them all! won't do any damage!!
  11. Anyone out there with an ST80 who can measure the available back focus? The distance between the eyepiece holder fully in and out. I'm also assuming these have 2" focussers; is this correct??
  12. http://www.lumicon.com/telescope-accessories.php?iid=LG1015&cid=59&in=Newtonian+%2F+Refractor+Easy+Guider+2in&hn= I've got this one. Fits into a 2" focusser and only takes up about 20mm of back focus. The guide camera/ eyepiece sits in the 1.25" extension at the side. By rotating the body you can usually find a bright enough field star for guiding. BTW I need either a PRISM diagonal - not a mirror type!, or a 2" extension to get my QHY5 guider to focus when a Canon 350D is at prime focus. No need for a guide scope with this set-up, and no relative "flexture" between the guide star and the CCD!!!
  13. Couldn't find a copy of the original instructions on the Meade site ( or the Californiastars.net, where I got my "back -up" copy), but to be completely open, yes the instructions do say that with the Meade Pictor CCD imager with the 15mm Spacer on an f10 system, it should give f5. The 30mm spacer is quoted as f3.3 and the 1.25" adaptor f3.0 "Other brands of CCD camera may vary slightly from the focal ratios in the above table" http://www.mapug-astronomy.net/ragreiner/opticlens.html#Top This reference gives info on back focus spacing etc. Sorry for the confusion!!
  14. Bang per buck, this has got to be the best software available to the amateur. As I mentioned, it does things my expensive TheSkyV6 can't do!!
  15. Been there, done that! On my 12" LX200 I ended up using the Optec NextGen 0.5 reducer, with the correct CNC spacers for the Canon350D it gives excellent results! Now that I've gone over to the "dark side" and concentrate on spectroscope work, it doesn't get used all the time, but it's there when needed. 2000% better than either of the Meade reducers ( I have both) Worth checking out. Billy.... the various SCT to T2 adaptors for the 0.33 were supplied not for modifying the ratio as much as for maintaining a design distance with different small CCD camera body sizes, as per the Instruction sheet ( copies available on MAPUG site)
  16. IRIS, will handle webcams, DSLR's and CCD cameras. Image aquisition and processing.
  17. AE do an equivalent. I've just fitted a set to a 10" LX200; very similar to the original Bob's Knobs, I think they cost about 19 GBP
  18. The "trick" is to get the files in the right format ( about 10Gb). I have them on a separate HD which is listed in the CdC "look-up" directory. BTW the V3 CdC is MUCH easier to use. I can supply DVD copies of the A2 files etc, cost of disk & postage. PM me.
  19. Thanks guys for such a warm welcome; doesn't melt the clouds but certainly makes me feel good!! I'm missing the SMC and LMC; there's so much in these nearest neighbours... keep you busy for a lifetime. I suppose they'll still be there when I get back...
  20. Leave it as long as you can. If you haven't cleaned one before drop me a PM, BEFORE you get tempted!!! I've cleaned many over the years and can give you a "heads up" on the process.
  21. By adding the USNO database I can get down to 18mag in CdC. Could never figure out what Stellarium want to be when it grew up? Just a sky display program?? The other one which I thought had great promise but carp interface was CnebulaX V1.7.4. Just love the star colours!!!
  22. I use CdC in preference to my expensive TheSkyV6!!! Not too complicated and a couple of nights will soon get you familiar with it. It's a great package! and you can add various catalogues and databases as you go along. Even use it to control your GOTO telescope. Download and install the whole package, if you haven't already. There's many members who use it, so there always going to be someone to help.
  23. Go for a 20Ah gel cell battery, an electronic charger and a 12-18V laptop transformer. It will work everytime.
  24. You could definately improve the collimation... needs a tweek!
  25. I've had the Lumicon, Meade and Celestron OAG over the years; my need to try and guide spectroscopes drives me nuts! I'd say other than the Lumicon GEG (absolutely fantastic!!) the Celestron would have been my choice. Radial adjustement without moving the camera and fine positioning of the prism... what more do you want?????
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