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    Astronomy (obviously) cycling, led cubes and leds in general. Sci-fi
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  1. Hi Thanks for replying Guys I am using a different guide scope for the 2 scopes however they are both the same magnification and field of view. I am using a QHY5 guide camera. I will have a go at increasing the calibration steps. This sounds like a good course of action. I will hopefully get a chance to try it this weekend, there has been so few clear nights here in scotland. John
  2. Hi I am looking for some advice and help here. I have been using PHD to guide my celestron C6 sgt successfully for a couple of years. I am using a finder scope with a cam attached to that as a guide scope and it works fine with my C6. However I recently bought a ED80 pro refractor scope which is lighter than my C6 and when I try to set up guiding in PHD I get the error message RA failed star did not move enough. If I try to take pictures with the scope without guiding I can only manage about 1-2 min before I get star trails. My question is how can I tweek PHD in order to get it to guide properly. Any help would be much appreciated. Regards John
  3. Hi I have an ed80 Scope I only got it a couple of weeks ago. I have ordered the baader 10mm eyepiece for this scope for imaging purposes also. It has not arrived yet but will let you know how I get on. I intend using the finder scope as a guide scope as i have a guide camera to fit it. As for magnification of this scope I had it out looking at Jupiter a few nights ago and was using my cheap Celestron Possles. I managed to use my 4mm barlowed to 2mm with this scope and get reasonable Views of Jupiter. Thats a mag of 300 I was well impressed with it. Good louck. John
  4. I have just bought a skywatcher ED80 pro and have not had a chance to look at Pleiades yet, but the forecast is for clear skies tonight and that is my first target. John
  5. Hi, I have a celestron C6 and I bought a 50mm finder scope to use as a guide scope, but I have just bought the skywatcher ED80 and it comes with a 50mm finder scope. I intend to use the finder scope as a guide scope the same way as I did with my 6inch reflector. This system works pretty well. You can buy a pretty cheap camera from modern astronomy that will attach to your 50mm finder scope you can then use PHD guiding to get long exposure times (in the order of minutes or longer). You do however need a mount that has a guide port on it. Luckily my CG-5 mount does. Good luck. John
  6. Thanks for the replies. Moving the counter weight only balances the scope in one plane you need to move the scope on its dovetail mounting to balance it in the other direction. John
  7. Hi I have recently bought a skywatcher ED80 telescope and am using it with my celestron CG-5 mount, however to balance it properly I have to have the telescope quite far back in the rings. I want to use this telescope for imaging and when I attach my DSLR I fear I will not be able to balance it properly due to the weight of the camera. Have you guys got ant tips for balancing this scope or can I get some kind of weight to hang on the front of the scope? John
  8. buy another they are fantastic scopes. They also look really cool to. John
  9. I own a celestron C6 sgt which I use for both viewing and astro imaging. I always thought aperture was everything. I am now questioning that after purchasing a skywatcher ed80 refractor. Last night the clouds cleared up and I managed to get a look at Jupiter. With the 28mm eyepiece supplied it looked clear but small as I was expecting. However when I started using my celestron possles on it the detail I could observe was more than I had thought possible from a wee 3 inch scope. Possibly even better than my 6 inch reflector. I managed to use my 4mm eyepiece barlowed to give effective 2mm and was amazed at the image this little scope produced. At the moment I am using some cheap celestron possle eyepieces but am in process of buying a 10mm hyperion. I can’t wait to see what kind of images I get with a quality eyepiece. I am very pleased with this purchase and if anyone is thinking about buying a first scope I cannot recommend this one enough.
  10. Thanks for the info I had a look at the Baader hyperon eyepieces suggested by ed and like the look of them. I understand they have a thread for a camera mount and DSLR photography is something i am interested in. So at moment I am edging towards a 10mm baader hyperon 68 degree eyepiece. The 3-6 tele vue zoom looks nice but is a bit more than I want to spend at moment but will keep it in mind for my next purchase of eye pieces. John
  11. thanks for the comments I am not against second hand equipment and ultimately I would like some Naglers in my collection but am aware they come at a price so maybe second hand is the way to go. The only thing that bothers me about spending so much money on an eyepiece is that I would not be able to tell the difference between a £100 and a £300/£400 eye piece. Is there really a huge difference between these price points or is is like hi-fi equipment i.e. to get that extra 1% you need to pay a lot more. I think they call this the law of diminishing returns. John
  12. Hi ed thanks for replying, ok i was a bit non comital with budget i do not really want to spend hundreds on an eye peice. I am looking for value for money as well as good optics but i would say my budget lies anywhere in the region of £50 - £150. Also my celestron telescope is C6 SCT. Thanks. John
  13. Hi, I am looking for advice about buying eyepieces. I have just bought a skywatcher ed 80 pro scope and it comes with a 2" 28mm EP and i was looking to buy another one but am not sure what to buy. The scope comes with a 2" to 1.25" adapter and i was thinking of buying a medium power EP but dont really know what is good and what would suit this scope. Not sure what my budget is but i would rather spend a bit more to get better EP. I will be using the scope for both planetary and Deep sky objects. I also have a celestron c6 scope. What EP should i be looking at? John
  14. Thanks for the reply's Not sure of the significance of six days though. On the program he quoted the Hubble constant at 70km/s/Mparsec so how people managed to work it out at 15 billion instead of 14 billion is beyond me. I may have to tweet him and tell him he is wrong. John
  15. I was watching Stargazing live last night and they were talking about the expansion of the universe and quoted the Hubble constant which describes the expansion of the universe as 70km/s/Mparsec. Apparently from this figure you can determine the age of the universe. Here is what I did to determine the age of the universe from this figure. Firstly I converted Mparsec into km. Now the speed of light in a vacuum is quoted as 299792458 m/s now the number of seconds in 1 year is 60x60x24x365.25 = 31557600s therefore light will travel a distance of 299792458 x 31557600 = 9.46 x 1015 m = 9.46 x 10 12km in 1 year. Now 1 parsec is a distance of 3.26 light years therefore 1 parsec is a distance of:- 3.26 x 9.46 x1012= 3.08 x10 13 km so a Mega Parsec is 3.08x1013 x 1x106= 3.08 x 1019km We can now wright Hubbles constant as 70 km/s/3.08x10 19km now the km cancel out and you are left with 70/3.08x1019s = 2.27x10-18/s Putting this figure into 1 should give the age of the universe so we have the universes age as 1 / 2.27x10-18 = 4.41 x1017s and we already know there are 31557600s in 1 year therefore the age of the universe is 4.41 x1017 / 31557600 = 1.40 x 10 10 years or 14 billion years. Now they said that this calculation should yield a figure of 15 billion years so where have I lost my billion years from can anybody spot it? I can not see an error in my logic but i am sure I must be doing something wrong. Can anyone help? John
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