So, here is the predicament; you are getting ready to do your film testing; you have decided to use the simple visual film testing technique. Visual film testing is a really simple way to determine your correct film EI and developing time. All you need to do is perform these tests on a grade #2 paper and you will know you are making the best possible negatives.
>But, there is one nagging little problem. If you are using VC paper, how do you know what filter, or light source setting, that will produce a grade #2 contrast? Even if you are using filters, each filter set has different filters that will give different paper grades on different papers. Even the developer you choose can affect paper contrast. You really need to KNOW how to achieve a true grade #2, using your equipment and darkroom, in order to do a valid film test.
What if I could show you an easy, inexpensive, and quick method that will get you plenty close enough? Well, here you go. . . “FINDING VC PAPER GRADE #2; EYEBALL CALIBRATION.” This method should get you well within range to get you started on the right track.