SIGMA 100-400mm F5-6.3 DG DN OS Contemporary L Mount

Sigma 100-400mm F5-6.3 DG DN OS Contemporary L Mount

This telephoto zoom lens covers 100-400mm and is built for Leica L-mount full-frame mirrorless cameras. It uses 22 elements in 16 groups, including one FLD and four SLD glass pieces, to control aberrations across the range. Optical stabilisation and a stepping motor give steady, quiet focusing for wildlife, sports and portraits. Weighing 1.1 kg with a 67 mm filter thread, it balances reach and portability.

Photographers wanting a single long zoom

Buyers who need a constant maximum aperture throughout the zoom range should look elsewhere. Shooters requiring a wider angle than 100 mm or a faster aperture than f/5 at the wide end will not be served by this lens. Those who need a tripod collar as standard equipment or a lens optimised for close-up macro work should consider other options.

Variable f/5-6.3 aperture across 100-400mm

The maximum aperture shifts from f/5 at 100 mm to f/6.3 at 400 mm, directly affecting exposure settings and depth of field at the long end. This variable aperture design keeps the lens relatively compact at 10.0 x 5.12 x 4.84 inches and 1.1 kg. Check whether your shooting style can accommodate the light loss at full extension before choosing this model.