Quote:
Originally Posted by Eden
I'm looking at a GSO truss as my next purchase. I'd expect that it would need collimation after purchase but ~$300USD for a Takahashi collimation scope is laughable. Are you suggesting that the many GSO truss owners out there who opted not to collimate with said scope haven't done a good job?
|
No not laughable. It is a tool for collimation. And it makes the process fast and easy. You will use it a fair bit and I have used it to help others out too.
I can tell you that a set of mirrors will move in transit. I went to a mates observatory recently to collimate a 10" truss RC. It went out of the box and straight onto the mount. I was there a week later and he had not touched it. It was badly out of collimation. Not the easy part of the secondary, but the primary. An hour later is was in collimation and ready to image.
I doubt many people could collimate the primary of these scopes just by a star test. In fact I would be surprised if that could even be done. The margin for error is very very small.
So don't take it personally. I am not trying to say people cannot collimate the scope. Its just the degree of miscollimation that will be accepted in the end. I have done a lot of high resolution imaging and I know thing or two about collimation now. I am just trying to save people some grief.
