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About festoon

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    Cambridge, UK
  1. Thank you Peter...yes you are right, this will help
  2. Thank you for posting the picture Micheal...thats a nice arrangement I have thought about putting my ED80 ontop of my C8 but when I planned it, the ED80 OTA seemed very long for my C8. I guess it works better on a C9.25
  3. Thank you for the replies John and Gus. If the finder is placed to the side does that mean that you should re-balance depending on which side of the meridian you are observing?
  4. I guess this is a simple question to answer!! I have a C8 OTA on a HEQ5 mount. I have just bought a Baader Standard Base finder shoe to fit on the OTA to attach my Altair 10x60mm right angled finder scope. It appears I have screw hole pairs that I can use that are in 3 places around the perimeter back of the OTA. If you consider the vixen dovetail bar to the bottom of the OTA, then these positions would be a screw set right at the top, to the right, and to the left. The picture below is not my OTA but I wanted to use a web stock picture to illustrate what I mean Is there a correct position to place the finder in terms of balancing the set up for equatorial use? The finder is quite heavy at 1kg. My gut feeling is to use the screw set right at the top, as that would keep the weight axis in a straight line from the counterweights through the OTA and through the finder scope. But in the picture, the left hand screw set has been used. Do you have any advice as to if this is important and what I should do?
  5. Afternoon, to help with the sale I'll reduce the price of this book to £27 including postage... This is now a real bargain as the book is £50 new! Any questions please feel free to ask
  6. Nice one Timebandit That's astronomy for you...I'm getting used to the idea we always need deep pockets
  7. Just bought the baader T2 prism diagonal set...could not resist!!!!!! Now I'll have to sell one of the 2" dielectric mirror diagonals and inclined to sell the WO simply as I'll get more second hand for it!
  8. This book is now also on ABS... I think postage will be £2.85 from Royal mail, so rounding down on my side total cost + UK postage would be £32
  9. Thanks John - the Tak prism is reasonably priced too
  10. Thanks Dave..appreciate the input Out of interest, do you have a particular prism that you can reccomend at 1.25"? I know I'm meant to be saving for a new OTA...but the article that YKSE posted really sells the prism! Might be a nice addition for viewing Jupiter this spring
  11. What a great review - thanks for posting 😀 Makes me want a quality prism 😀
  12. Yes the revelation is a GSO. It has a good quality feel and the reason I bought it was after good reviews here and on CN 😀
  13. Thank you John I guess you could pick that up by using a test with and without the diagonal (using an external focuser for an SCT) and looking for movement of the position of the star. So if the star was dead centre in the eyepiece without the diagonal. Then after the diagonal is the star still in the centre of FOV.
  14. Thnak you John...hopefully there will be no difference! Just out of can a diagonal change the collimation if it is a flat? probably I'm not understanding something
  15. Thank you for the inputs on what might be a good test. I will try a range of these tests looking at scatter on the moon and detail on Jupiter. Also try splitting a tight double or picking out faint stars in a cluster. If I had a binoviewer, I guess I could have placed both diagonals in a the same time for the tests! All I need now is a clear night sky and a clear night in my calendar to do the tests