How do I add an f/6.3 reducer/corrector to a telescope?

[theskyhound]

Hello,

It sounds like you have it set up correctly with regard to the coma corrector.

The built-in focal changer setting adds a piece of glass to the calculations used in the telescope model. Its meant for the special case where you have entered the modified focal length of the telescope to reflect the presence of a permanent focal changer. In practice its not going to make a big difference in the calculations. So one thing you could have done was to enter the corrected focal length of the telescope with the coma corrector in place, ticked this box, and then you would be done. But the other way to do it, especially if if you are ever going to remove the focal reducer, is to set up the way you have already done. This gives you the ability to uncheck the box on the eyepiece selection menu if you remove the reducer.

To sum up, there are two ways to do it:

1. Enter your focal reducer and leave the built-in box unchecked
2. Skip the focal reducer by entering the modified focal length, and check the built-in box.