Patrick, The APO Sironar S that has been recommended above is excellent in my experience, but it comes with a bit of a size and weight tariff. In case size and weight might be an important consideration for you, you should consider the Nikkor M 200/f8 which is tiny (takes 52mm filters) and light (180gr). It only has a 210mm image circle (adequate for 4x5), and is a bit hard to find used and in VG/EX condition - but if you're a backpacker who needs to go small and light it should be worth consideration. In perusing some of John Sexton's books I've noticed that he has used the Nikkor M 200 for many of his featured landscape images over the years.
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