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Originally Posted by Hitchhiker
Hi Eric, image scale is dependent on Focal Length. The longer your focal length, the smaller your Field of View.
The focal length of your 200mm F4 reflector is 800mm.
The focal length of your 80mm F11 refractor is 880mm - your refractor gives you a smaller FOV than your reflector (as you have just found out)
As another example, an ED80 (80mm F7.5 ? ) has a focal length of 600mm and would give you a larger field of view than your 200mm reflector.
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Cheers Adam. I get confuse with FL and FOV . You have certainly cleared up my confusion. Thanks.