Question 1

Is the Sigma 105mm f/1.4 DG HSM Art discontinued?

Accepted Answer

Yes, the Sigma 105mm f/1.4 DG HSM Art has been officially discontinued. New stock has dried up across most retailers, which makes the used and second-hand market the primary way to get hold of one. The optical quality is unaffected by discontinuation — the lens performs exactly as it always did.

Question 2

Does the Sigma 105mm f/1.4 have weather sealing?

Accepted Answer

The Sigma 105mm f/1.4 DG HSM Art has a dust and splash resistant structure. It is not fully weather sealed to the same standard as pro-grade Sony GM lenses, but the dust and splash resistance gives it a meaningful level of protection for outdoor shoots in light rain or dusty environments.

Question 3

Is 105mm a good focal length for portrait photography?

Accepted Answer

105mm is a classic portrait focal length. It gives you enough working distance from your subject to produce natural-looking facial proportions, while the f/1.4 aperture on this lens creates strong background separation even at that distance. Most portrait photographers find it sits between 85mm (tighter quarters) and 135mm (more compression), making it versatile for both headshots and three-quarter-length shots.

Question 4

Is 105mm good for street photography?

Accepted Answer

For classic street photography — fast, candid, wide-angle work — 105mm is on the longer end and this lens is very large and heavy at 1,645 g, so it's not a natural fit for all-day street shooting. That said, the focal length works well for compressed street scenes, isolating a subject in a crowd, or environmental portraiture in an urban setting where you want distance from your subject.

Question 5

What filter size does the Sigma 105mm f/1.4 use?

Accepted Answer

The Sigma 105mm f/1.4 DG HSM Art uses a 105mm filter thread. This is a large diameter, and compatible filters — especially quality ND or circular polarisers — are significantly more expensive than standard 77mm or 82mm options. It's worth factoring this into your total cost when buying the lens.

Question 6

How does the Sigma 105mm f/1.4 compare to the Sony FE 135mm f/1.8 GM?

Accepted Answer

The Sony FE 135mm f/1.8 GM delivers sharp results and slightly shallower depth of field at equivalent distances due to the longer focal length. The Sigma 105mm f/1.4 DG HSM Art, on the other hand, has a larger maximum aperture and many photographers describe its bokeh as smoother and more painterly in character. The Sigma is also considerably heavier. Which is better depends on whether you prioritise clinical sharpness (GM) or a distinctive rendering quality (Sigma).

Question 7

Does the Sigma 105mm f/1.4 DG HSM Art work on full-frame Sony bodies?

Accepted Answer

Yes. The lens uses the Sony E mount and is a full-frame (FE) lens, so it covers the full sensor on bodies like the Sony Alpha 7 series, Sony Alpha 9 series, and Sony Alpha 1 without any crop or vignetting. It also works on APS-C Sony E-mount bodies, where it behaves like a 157mm equivalent focal length.

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Sigma 105mm f/1.4 DG HSM Art - Sony FE

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