How would an Edge HD 14" compare with a...
Posted 10 April 2013 - 08:45 AM
I have a CPC 1100 and a 10" Dob with which I find the views to be very similar. I also have a 25" Dob that is not operational right now and I don't really want to include it in the analysis here because it or anything equivalent won't fit in the exploradome.
My exploradome has a concrete pier and I have had my CPC 1100 mounted on it before and now I have an atlas mount on it with a small refractor.
I was interested in an Edge HD 14" to mount on the pier as this is the biggest that I think I could go (I don't want a Meade 16").
What I would like to know is if the views through the Edge HD 14" would be comparable to a premium 14" dob (premium mirror--Zambuto, etc.) as far as quality goes?
Posted 10 April 2013 - 10:10 AM
Posted 10 April 2013 - 10:22 AM
Posted 10 April 2013 - 04:12 PM
Posted 10 April 2013 - 11:20 PM
That says more about the Orion than it does the C14. A dob with premium optics, like a Zambuto mirror, would make things a lot closer.
It would still be an apples-to-oranges comparison, though. The C14 is f/11 and a 14" dob would probably be around f/5. Different scopes for different missions.
Posted 11 April 2013 - 09:21 PM
Posted 12 April 2013 - 10:00 AM
Posted 12 April 2013 - 11:52 AM
I thought my 14" EdgeHD was very very well collimated until one night out at my clubs site a few people with a LOT more experience than myself decided that the collimation needed tweaking. We all spent about 20 or so minutes collimating on a star. Not just concerned with concentric rings but also the in-focus and out-focus flares to one side or another on the the star as you pass through perfect focus. Eventually we got to the point where the rings were perfect and there was no flares. The star would focus to a pin point and back out again and back in again and back out again with no little limbs.
I then pointed it at Jupiter and wasn't all that impressed. I asked myself, what did we gain? I mean it looks ok but not as sharp as I would have expected. It was a little later that it dawned on me that I still was using a very high power eyepiece!! I was at about 400x and the seeing just wasn't good enough for that. So I dropped it back to about 200x and Jupiter was so amazing I almost cried.
One of those experiences where you get glasses for the first time and realize how bad your vision really was.
Moral of the story? You could have two OTA's that are well collimated and yet one could still be better collimated than the other which results in an unfair comparison.
Posted 23 April 2013 - 07:17 PM