I purchased a Pentax 645 a couple of months back and made my first enlargement last night from a test roll. I'd have to say that I am amazed at the clarity of the picture. It is totally different from my Pentax K-1000, but I can still tell that it is a picture taken from a Pentax camera, (or maybe it is my imagination). Enough of the rambling. I have a few questions for those of you who shoot this format. They are as follows: 1.) What is a standard size for setting the easel so that I can have even borders? It found it difficult to adjust my easel to have equal, or near equal borders for the picture. Is it possible, or is this just a drawback of the 6x4.5 format. 2.) How many of you have an actual 6x4.5 negative carrier? If so does it make a difference in getting even borders for the enlargement? 3.) What is the best enlargement lens for medium format? I have option of using a 75mm or 80mm lenses. Thank you, Jamusu.