|
Thanks Craig for the reply. I appreciate your thoughts on the matter.
363x 173x 181x
Could you elaborate a bit on the differance in opperation please. (I probably have a very nieve view, but I would have thought that once the OTA was mounted to the mount via the appropriate method, and the focuser and camera in place, then the operation would only be the focusing(which I gather is ONE of the hard parts).
Other than collimating, what kind of maintance is involved and how often does it need performing. I havn't found much on maintance so far other than collimating.
I have read and learnt alot about FOV with regards to visual viewing since I started this thread and how same EP would give smaller FOV and more mag. in larger apertuer ATO's . Playing with the FOV feature in starrynight I can see this in practice.
I am having difficulty understanding the FOV and CCD camera.
In Starrynight I can setup what equipment I want to use and it will show the various FOV's of the OTA and EP by drawing a circle, theoretically what I would see thru the selected setup. and workout the various magnifications.
When I select the CCD camera (Meade DSI II) I get a rectanle on the screen representing the ccd's chip. This is the same size (left to right) FOV as the 5.5mm EP at X magnification would give.
One thing I dont understand is when I use the 127mm (F/L 952mm) with the CCD the FOV is 3 times bigger than the FOV would be if the 10"(F/L 2000mm) with the same CCD is used.
I was expecting it to be the other way around.
Any words of wisdom would help putting this matter straight would help greatly in understanding.
I hope my understanding/use of the FOV feature in Starry Night is correct and I really hope my discription/question isnt to confusing.
Thanks John.
|