infinity and beyond

Eclipse preparations for if we are cloud free.
Catadioptric (mirror) lenses focus beyond infinity to allow for expansion.
how close to infinity the sun is we might see.
500 mm lens, 4x ND filter rear mounted. lens cap, sunglasses, @x extender and  mount, set low ISO setting, and of course the tripod.
lens used today Leica Elmar -C 90mm f4 for the CLE.