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Originally Posted by allan gould
Again there is bashing of scopes and opinions that people have only read about. Actual experience of scopes would be invaluable here. Like Hum I have a 127mm ED scope that is flat to the edges. No flattener needed. No colour on bright stars. I'm not offering opinions on other scopes except for wo. Have a wo triplet ed that has colour etc and not a flat field. Don't bag the 127mm if you havnt used one. The focuser on mine wasn't as bad as some, but a moonlight focused transformed it.
Just make sure you get the hand figured Japanese glass in the 127mm AND not the chinese machine figured glass, remember you do get what you pay for.
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Hmm, so do you specifically ask for the Japanese glass from NorthGroup?
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Originally Posted by pmrid
When I bought my Ed127 I specified that I wanted the new 'improved' focuser for imaging work. And so it is. It is a mix of good and not-so-good. The good is that it is smooth, positive and has a decent focus lock that does what it should. The bad is that it uses a compression ring and I have a dislike of those things.
Optically, I can't fault it at all. I'm delighted by the image quality.
Peter
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Oh good, that gives me more confidence.
Also, having never owned a refactor since my first department scope (except for my ED80 guide scope) - Do any of you ever collimate a refractor? Part of the reason for me wanting one is that I would travel with it a lot, and whilst I'll take very good care of it, I don't want to collimate everytime I get to a new spot as with a newtonian.
George