Great idea for a thread!

SMC PENTAX-A* 300mm F4, aperture wide open. This lens has no auto-focus capability.

#1.

Camera: PENTAX *ist D
Lens: SMC PENTAX-A* 300mm F4 lens (MF-only)
Other equipment: Canon monopod 100
Aperture: F4.0
Shutter-speed: 1/640 second
ISO: 800
Focal length (optical): 300mm

#2.

PENTAX *ist D with SMC PENTAX-A* 300mm F4 lens (MF-only)
Canon Monopod 100
1/250 second at F4.0
ISO 400
300mm

#3

PENTAX *ist D with SMC PENTAX-A* 300mm F4 lens (MF-only)
Canon monopod 100
1/500 second at F4.0
ISO 800
300mm