hi i'm new to this forum and i followed this link from another forum. my questions for this mask are two
1. since i am the owner of an 8'' dob and i am starting astrophotography with an heq5 pro mount do i need this mask for focusing or is it only for SCTs, MACs etc?
2. the angled bars are at 40 degrees from the center of the of the mask or 20 degrees (i saw this value at another forum)