I recently inherited a large quantity of photographic equipment including film and stuff. One of the film stocks that I found in the lot is Polaroid Professional Chrome 4x5 Color Reversal Film 100D. I understand this is E-6 film but my biggest question is how to load it into the 545 holder. I have read the instructions that I found in the bunch but I guess that I am just to ignorant to make heads or tails of it. I moved the lever over to "L" and inserted the envelope into the rollers but the next step according to the instructions is to "pull out the envelope as far as it will go", phat the wuck? Should the film holder be loaded in the camera before the envelope is pulled out? What keeps it from being exposed if not? How far should the envelope be pulled out? All the way out or is there a point that should not be passed? I have about 20 sheets of this stuff and I would like to see what it will do and not waste any of it. All of the film has been in the freezer since new and I am thinking it should still be good with maybe some color shift. If it is bad because of storage, that's ok but I don't want to be the source of any problems.