I am researching lenses for a telephoto purchase and have come down to three lenses:
Canon 100-400 IS
Canon 300 f/4 IS
Canon 400 f/5.6
Looking at the price point of each lens, I assumed that the 400mm would be a wise choice since it has great IQ and I would usually be shooting at 400mm anyways. I am thinking of buying used since I do not really see the need to have a "brand new" lens and that is where my problem comes. When I look on the sale threads, there are never any 400 primes for sale. On the rare ocassion that there is, they usually are going for around $1000. I can buy one brand new on B&H for that price, so why are they so high?
The new 100-400 is around $1400 whereas the new 400 is $1000. I would assume, based on this price comparison, that I could get a used 400mm f/5.6 for around $300 less than a 100-400. This has not proven to be the case however. Most of the used 100-400 are going for around $1150 and the prime is going for around $1000. I would think that I could pick up a used 400 for around $800. Is that just wishful thinking?

