I have the 28-80mm FA power zoom :
SMC Pentax-FA 28-80mm F3.5-4.7 Reviews - FA Zoom Lenses - Pentax Lens Reviews & Lens Database
And I'm thinking about "mods" LOL
I find it heavy and I suspect it's due to the power zoom motor inside. I wonder if it's not too hard to dismantle the lens and remove that motor ?
Or if the lens' IQ doesn't warrant all the work LOL
I have the P-Z-10 film body that has the electrical contacts inside the lens mount to power said motor, it's pretty fun to use LOL
I also figured it would be easy (yet bulky) to add a battery to the lens so it can power zoom on a regular Pentax camera.
I only spent about $30 on the lens and compatible film camera.
Cheers,
Craig
edit : Hey I see the K2000 and k-x have the electrical contacts for the power zoom lenses :
http://www.imaging-resource.com/PRODS/KX/ZURFRONT-L.JPG
The ability for them to use power zooms must be disabled in firmware (???) why are the contacts in there ?