Glass

Front element

Flawless

Rear element

Flawless

Imaging

Sharpness

n/a (line pair test is invalid for fisheyes)

Spatial consistency

All quadrants equal sharpness

Aperture consistency

Normal wide-open and stopped down

Chromatic aberration

Normal

Lens flare

Normal

Mechanicals

Manual focus ring

Flawless

Autofocus

Normal speed, sound, and accuracy

Active stabilization

n/a

Aperture blades

Smooth, clean, full range of motion

Zoom ring

n/a

Distance scale

n/a

Filter ring

n/a

Cosmetic

Barrel

Very slight wear

Tripod ring

n/a

Caps

Minor scuffs and scratches

Internal dust

Light

Notes

Nice looking lens with flawless glass. Comes with caps and original Sigma case.