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Aaron
The thing to understand is that the GSO f4 imaging scope is just that, an imaging optimised scope. As such it has several differences between it and a more visual oriented one.
1 Shorter focal length. At f4 rather than f5 it reduces the length of the tube which makes it easier to handle on an imaging mount. Also it makes it "faster" so exposure times are reduced. The speed of the scope is of itself not relevant for visual purposes, but can introduce complications. The main ones are more coma in the image, which for imaging can be dealt with via a coma corrector and collimation becomes more finicky.
2 Position of the focal plane. An imaging scope is designed so the image focuses where a camera sensor would be which is usually further away from the focuser and would be used for an eyepiece. This may entail using an extension tube to achieve focus with an eyepiece.
3 Larger secondary as already discussed.
Generally speaking, these scopes can be used for visual use as long the user is aware of these issues and is prepared to live with them.
May I ask is it intended to mount this scope on an EQ mount or as a dob?
Malcolm
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