Max. Aperture F/4.5
Min. Aperture F/22
Optical Construction 6 blades
tested with camera: Pentax K20D
++ incredibly sharp at 250 mm at all apertures (remind you, it's a zoom lense and very old)
- chromatic aberrations
ISO 200: Middle Centre (MC) Crop
F/4.5 - 1/350s F/5.6 - 1/250s F/8 - 1/125s F/11 - 1/90s F/16 - 1/45s F/22 - 1/30s
ISO 200: Left Top (LT) Crop
F/4.5 - 1/350s F/5.6 - 1/250s F/8 - 1/125s F/11 - 1/90s F/16 - 1/45s F/22 - 1/30s
further links about this lens:
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