Would have posted this in the begginers forum(I am) but thought it better posted in here.I have an 8" Dobsonian telescope I'd like to by a solar filter made of solarlite for and have a small knowledge in field-stop, can you tell me whitch if any between a filter with a field-stop diameter of 203mm or or a filter with a field-stop diameter of 165mm will work better with my scope. Or is the field-stop in this sense just the inside diameter of the precast solar filter?