When I think about writing about camera or darkroom techniques, I wonder if there is any need to write anything at all. Sometimes it's already been written as concisely and clearly as can possibly be expressed. Here is an example that struck me this morning... THE TEST STRIP A test strip is one of the simplest things in photography and yet it is one of the most scientific. As a matter of fact, despite all of the advances in determining exposures and correct printing papers for our conditions, this old-fashioned method of determining what is right for our needs has never been surpassed.