I just recently purchased an ST-4, and would like a guidescope to use it on, primarily for widefield astrophotos. I am hoping to get an 80mm refractor with a focal length between 400 and 750mm. Apogee, Inc. sells one for $99. I'm hoping someone has one they're not using, and will be willing to beat that price. I'm not concerned about looks; I just need a lens and tube that will focus well in the center of the field.