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Everything posted by xboxdevil

  1. I have the Revelation collimator and it is easy to collimate once you understand the principle. This will give you an idea what you will need to do (if anything): Astromart Articles - Collimation of Laser Collimators EDIT John, just read your post and that's the ugliest V block I've ever seen! luckily mine looks more like this one: http://www.cloudynights.com/item.php?item_id=520. There again if it works then who cares :-)
  2. Have you tried using a barlow to increase the accuracy? there is some good information here: http://www.cameraconcepts.com/barlowed%20laser%20collimation.pdf There again if the Cheshire works best then keep to it, I just like to use them both to validate the results.
  3. I don't think that your collimated laser is the problem here, I've had this problem in the past and for me it was when I introduced a rotational error to the secondary as main the nut that connects the secondary to the spider wasn't tight enough. Whereas with the Cheshire you'll spot that your mirror has shifted straight away when your adjusting and move it back.
  4. Good spot, but no good for any of my focal lengths either.
  5. According to the Heavens Above app. on Android there will be a -8mag Iridium flare at 7.30pm tomorrow 44deg alt, pretty much due South (well 167 deg.) From what I understand this will be visible for a radius of about 50 miles, I might try one of those wish upon a star moments :-)
  6. I've tried a 5mm TMB clone in a Heritage 130p and it's always been great, I also tried a 3.2 a couple of times but the views were probably just past the limits of seeing at the time and not quite as sharp, I think the 4mm should be fine though and even the 3.2 on nights of better seeing.
  7. Hi Alex, it is as simple as that, it plugs in just the same :-)
  8. Yep, it's a focus mask for getting a precise focus on whatever celestial object that you are looking at. They are a great help if you plan to do any imaging or are sick of forever trying to get focus. I did try to make one using a template from here: astrojargon - Bahtinov Focusing Mask Generator: Overview but it was a but flimsy and binned it. In the end I bought a very high quality one like this Bahtinov Focus Mask for 10" SCT on eBay (end time 21-Feb-11 18:24:53 GMT) from Keith at Morris engineering on ebay, service and quality were exceptional and he made it to my specs.
  9. It sounds like a better design than the old skywatcher flextubes. As you say the thinner mirror should give quicker cool down times and the lack of mirror clips will also help reduce diffraction spikes too. Now if I only had dark skies....well actually if I had any skies without cloud!
  10. Wow, that's about 13 thousand miles away, by my reckoning that's about 1/18th of the distance to the moon.....DUCK!!!!
  11. It's only simple if you know it! you get the metal bit on the barlow and slide that into focuser, then you slide the eyepiece into it :-)
  12. You can use this function to set up to six objects per session so that you can go back to objects without the need to find them again. Just be aware that any objects that you save (Set+ number) can only be retrieved (Go + number) at the same session. The Cruise option just cycles between any stored positions that you have, I think if you press a key it exits from cruise mode.
  13. Does anyone know if it's possible to add in the % chance of precipitation?
  14. Great work Lewis, that's just what I've been looking for, it will be interesting to see how accurate it is for my location. Do you have any idea where the weather info. comes from and how exactly it's calculated, eg I live in Stockport so is it a conversion of the nearest main met. data eg Manchester Airport or an amalgamation of multiple sources? EDIT Ahhh, just been reading http://7timer.y234.cn/misc/apanel_en_full.pdf ...it's much more sophisticated than I realised :-)
  15. It shows you that there is mileage in the "through the window technique", the only thing I've tried to look at through the window was the moon and that wasn't great to be honest, but as you're very well aware there is still something satisfying about being in the warmth :-)
  16. No probs, I'm sure you'll get some other good recommendations too, keep an eye on here: U.K. Astronomy Buy & Sell and various eyepieces come around. It might be an idea to try a few different types to see what agrees with you.
  17. I would recommend a TMB Planetary clone these are available from ebay and 1.25" Eyepieces (the bottom left picture) My 8mm one probably gets the most use (187.5x mag in my 12" dob), although for your scope a 6mm will give 200x, which is probably about on the edge of the normal seeing that I get, so would be usable half of the time or slightly more, if you want to play it safe you could go for a 7mm which will give you 171x and should be usable most of the time.
  18. If I understand you correctly you are asking if the tube and base can be separated, if this is the case then yes very easily by hand and without the need of a screwdriver.
  19. Interesting...I bet it would be, so long as the quality was good. I wonder what pv rating you could get with these?
  20. You can remove the tube from the base and put it on something like a skymax127 alt/az mount if that's what you mean? what exactly are you trying to achieve?
  21. Cool, when I mentioned focusing on a star it was more just as simple test to see if things look ok, when my collimation was way out the focus would not come to a central point and the Moons around Jupiter were oval, towards the end of this article it explains a proper star test in more detail: SkyandTelescope.com - Do It Yourself - How To Collimate Your Newtonian Reflector
  22. Hi Pat Before you adjust these screws on the primary mirror you should check out that your secondary mirror is correctly aligned and rotated. When you are happy with that you then move on to the primary mirror. You may know this but by now, but just to make it clear you need to turn the thinner (You've labelled number 2) thumb screws a few turns anti-clockwise to release the tension, then turn the larger thumb screws (You've labelled number 1) clockwise until you hit a stop when the mirror is right back in the tube. Then turn the large one's back anticlockwise by one full turn before finally adjusting two of them clockwise until you get alignment. Good luck and don’t let the collimation spoil your views if you can get tight focus on a star to a pin point then you are ok. I’ve used my scopes visually when they were way out and in the main it didn’t bother me that much.
  23. I find the TMB clone's superb in my f5 scope, so far the 8mm has given me the best views of Jupiter that I have seen. You have plenty of other options though and a lot of it comes down to the eye relief and the field of view that you will get.
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