I also have the 135 f2.5 Takumar. Its build quality is fine, and since it doesn't seem to be multicoated flare can be a problem, but with SLRs we can see that and change framing. Also it does have a telescoping lens hood. For the curren cost of examples in good shape who can complain? Just wish it had an "A" stop on the diaphragm to ease use on my K5. But on my manual Pentaxes it is happy.