Originally posted by hcc With the DA550mm on the Pentax lens roadmap, these lenses might become cheaper !? Might be ....
Very much doubt it. The only competition for the proposed 560mm is the Sigma 500mm f/4.5 and we do not know what the aperture on the 560mm will be yet (unless I missed that) so maybe not even then, a 560mm f/6.3 is not going to knock the Sigma out of the running.
The other fast glass will remain expensive both because it IS expensive and because there is not much of it floating around. And some of that stuff is starting to edge into collector piece territory which means the value no longer as any relationship to the actual utility of the lens, only what someone will pay for it.