Imaging TrainPosted By Jim Thommes |
Richard,
Wow, lots of questions...
Distance detween the camera and the focal reducer is critical - it determines the focal reduction. To get the ideal .63 reduction, you need about 85 mm. Focal reduction trades of resolution for a larger field. So, yes,putting the camera further away from the reducer looses resolution.
If the camera / focal reducer combo is too far away from the backplate, Then you can't reach focus. You will know - you focus the stars smaller and smaller and then hit the end of focus travel before you reach focus. I don't see this happening with your SCT though with a 0.63x reducer.
The only light you *lose* is
Wow, lots of questions...
Distance detween the camera and the focal reducer is critical - it determines the focal reduction. To get the ideal .63 reduction, you need about 85 mm. Focal reduction trades of resolution for a larger field. So, yes,putting the camera further away from the reducer looses resolution.
If the camera / focal reducer combo is too far away from the backplate, Then you can't reach focus. You will know - you focus the stars smaller and smaller and then hit the end of focus travel before you reach focus. I don't see this happening with your SCT though with a 0.63x reducer.
The only light you *lose* is
