Quote Originally Posted by waltereegho View Post
Take your pocket knife and carve a large arrow on all your lenses. The arrow on the negative will tell you the direction. Satisfaction guaranteed!
Well, first, I would use a Sharpie marker to make the arrow. What if you used a different camera that wasn't broken? Then you would have to remember that the arrow is pointing the wrong way.

Also, don't forget that making the arrow on the glass that is in front of the nodal point of the lens will make it upside down but, if you mark in on the glass that's behind the nodal point it will be right side up.

Always remember: Upside down is really right side up and left is always right except when right is really right... which means that upside down is really upside down and upright is really right side up.

If you don't remember, you're likely to get everything bass ackwards and upside wrong!