Originally posted by Jome That doesn't help me
and I have seen a 560 new for 4000$
My response to your original question can only be with another question- the real question is how often would YOU use it, and how important having one would be to YOU. Everyone's needs are different. For some people, they would use it on a regular basis, as it is the best tool for their main interest. For others, only occasional use will still justify putting out the expense, because when the need arrises, having it is indispensable. Nothing else will do. For still others, the lack of use in their case would not make sense.
The DA 560mm f/5.6 is a very fine lens and a very good value. It is very well made with AW construction and HD coatings. It is a good alternative, but it is still a stop slower than the older FA* 600mm f/4, which can make a difference in some situations, and which also is a FF lens.