I have been looking at the Mamiya 55mm 2.8 N manual focus lens for my 645. Will this lens fit/be compatible with an old M645J that I have? I would like a wide angle lens, but not too wide. I would like to use it for everyday shooting of people and landscapes. Is this lens reliable? Will it fit on my older M645J body? Is it sharp? Does it sffer from flare? I would like to hear about experiences from anyone who has used this lens.