There're many discussions on other forum about SCT's actual focal length depending on visual back setup and Baader GPCs' actually magnification factors. As it was a cloudy weekend, I took the chance to do some measurement to get some hard data to get better understanding of it.
1. The setup:
A yardstick on a table in the garden some 22meters away from C8, some combinations of my visual back setup are measured:
1.1 The stock 1.25" visual back
Despite its cheep shap
There're many discussions on other forum about SCT's actual focal length depending on visual back setup and Baader GPCs' actually magnification factors. As it was a cloudy weekend, I took the chance to do some measurement to get some hard data to get better understanding of it.
1. The setup:
A yardstick on a table in the garden some 22meters away from C8, some combinations of my visual back setup are measured:
1.1 The stock 1.25" visual back
Despite its cheep shap