Well I guess I will start off the reviews here with my personal favourite the F*300...
This is a lovely lens.. Fantastic optical quality, slightly above in my opinion the Canon equivelant, though much smaller and still very well constructed... Optically it is the same as the FA version, but I prefer this one due to the tripod mount..
Minimum focus distance is around 2 meters which can mean some nice closeups with the equiv. FOV of 450mm on our APS DSLRs.. It has a 67mm thread for filters and comes in at just under 900gm..
No problems on any Pentax DSLRs focuses accurately no FF or BF issues at all to speak of..
Built in hood is handy (one less thing to forget), it unscrews ad slides out then screws into place securely.. Tripod mount is removable when you don't need it.
Overall Rating - 4.7
Construction -
5 - Its very well built solid metal lens. And small for its focal length.
Usage -
4- Due to its construction it is a bit heavy and not the fastest to focus either..
Optical -
5 - I can't take marks off here it is a fantastic lens in this regard.
Some Samples
This is the best part some sample shots with this lens...
If you want any more detail let me know, will do my best to answer all questions..