Originally posted by PrimeObjectif I think the key is to always have your eyes peeled for MF lenses, and eventually you'll find a steal.
It's harder for me to resist buying these than finding a deal. Five of these cost me $50 total before shipping.
Starting in the front row, left:
XR Rikenon 135/2.8 - 55mm filter, 8 aperture blades, aperture ring only clicks at full stops.
Pentax-M 135/3.5 - 49mm filter, 8 blades, small enough to travel, cheap because paint falling out of lettering in front, not a typical issue.
Vivitar 135/2.8 - M42 mount, 55mm filter, 6 blades, Komine, focus ring turns opposite of typical Pentax.
Back row, left:
SMC Pentax 135/2.5 - 58mm filter, 8 blades, heavy, the only one of these with no integral hood but super-cool, you don't want to know how little I paid.
Takumar Bayonet 135/2.5 - 52mm filter, 8 blades, battered hood is common, closest minimum focus distance of 4.2 feet.
Vivitar TX 135/2.5 - 58mm filter, 6 blades, longest minimum focus distance of 6 feet, cheap
if you have the TX mount.
I plan to test these one day. I've only used the Pentaxes enough to know they're very good; the rest are recent or haven't seen much use. Minimum focus distance is more important than you think for indoor use. Five feet is typical but closer than that can be very useful.