Thought I would share this.
You can generate a Bahtinov mask of your choice and have it printed onto a transparency.
Attach it to a ring the size of your scope and you are ready to go. No cutting, no fussing. Just focus right through it. Works great. Made one for my 72mm at a cost of about 4 dollars.
Very easy and you can save a ton of cash!
Added by Mark Roberts on October 4, 2011 at 1:36pm —