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Re: ?Image Plane?

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Posted by Robert May on August 31, 1998 19:20:50 UTC

The image plane is where the image is first formed. It is also called the Focal Plane. It almost always found inside the focuser and you can consider the opening of the focuser towards the scope as the largest image plane that you can get. The actual image plane is to be found in your EP where the aperture stop is. That is that odd ring that you just quite can't figure out what it is for. Looking through the EP into a bright field (in the daylight for example) will show a sharp edge to the field of brightness when the eye is close enough to the EP. Putting something up to the same place as that ring will bring the object into focus! Alternatly, you can use 1" as the dimension for a 1.25" focuser or 1.75" for a 2" focuser for the image plane dimension.

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