Question 1

Is the Sigma 100-400mm f/5-6.3 DG DN OS Contemporary compatible with Sony APS-C cameras?

Accepted Answer

Yes. The lens uses a native Sony E mount, so it fits both full-frame Sony Alpha bodies (like the Sony Alpha 7 series) and APS-C Sony E-mount cameras. On an APS-C body the field of view is equivalent to roughly 150–600mm, giving you even more effective reach for wildlife or birds in flight.

Question 2

How does the Sigma 100-400 DG DN differ from the older Sigma 100-400 DG OS (EF/SA mount)?

Accepted Answer

The DG DN is a purpose-built mirrorless design, not a port of the older DSLR version. It uses a stepping motor AF system optimised for Sony's phase-detect autofocus system, and the optical formula was redesigned for the shorter flange distance of mirrorless mounts. The result is better AF integration with Sony bodies and a more compact overall package than adapting the EF version.

Question 3

What Sony cameras work best with the Sigma 100-400mm f/5 6.3 DG DN OS?

Accepted Answer

Any Sony E-mount body will accept this lens natively. Full-frame bodies like the Sony Alpha 7 IV or Sony Alpha 1 make full use of the image circle, while APS-C bodies like the Sony Alpha 6700 give extra effective reach. Phase-detect AF on recent Sony bodies pairs well with the lens's stepping motor to track fast-moving subjects.

Question 4

Does the Sigma 100-400mm OS work well for birds in flight?

Accepted Answer

It handles moving subjects reasonably well thanks to the stepping motor AF and built-in optical stabilisation, but real-world reviews consistently note that its AF tracking speed sits a step below first-party Sony GM glass or lenses like the Tamron 50-400mm. For casual wildlife and slower-moving birds it's very capable; for high-speed erratic subjects you may want to budget for something with faster linear motor AF.

Question 5

What filter size does the Sigma 100-400mm f/5-6.3 DG DN take?

Accepted Answer

The filter thread is 67mm — a common size, so filters are affordable and easy to find. A circular polariser or ND filter in 67mm screws straight on without any step-up ring.

Question 6

How close can the Sigma 100-400 DG DN focus?

Accepted Answer

The minimum focus distance is 1.6m at any focal length. That's close enough to photograph medium-sized wildlife subjects at 400mm and fill a good portion of the frame — useful for dragonflies, small birds perched nearby, or flower details when you combine the telephoto compression with that close focusing capability.

Question 7

Is buying a used Sigma 100-400mm f/5-6.3 DG DN OS worth it?

Accepted Answer

Absolutely, especially since this is a native mirrorless design with no adapter compromise. The build quality is robust enough that second-hand copies tend to hold up well. On Camera-tweedehands.nl every lens is individually photographed so you see the actual item, and each comes with a minimum 12 months warranty — making a pre-owned copy a smart way to get serious telephoto reach at a lower entry cost.

Question 8

How does the Sigma 100-400 DG DN compare to the Sony FE 100-400mm GM?

Accepted Answer

The Sony FE 100-400mm f/4.5-5.6 GM OSS has a slightly brighter maximum aperture, Sony's own XD linear motor AF, and G Master optical tuning — all of which push it into a higher price bracket. The Sigma DG DN is lighter on the wallet (especially used) and still delivers strong image quality with native AF. If budget is a factor and you're not shooting professional sports, the Sigma is a genuinely compelling alternative.

Mount	Sony E
Focal range	Short Telephoto
Prime / Zoom	Zoom
Focal length (min)	100 mm
Focal length (max)	400 mm
Max. aperture	f/5
Stabilisation
Weight (Grams)	1140
Year of release	2020
Auto Focus

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Sigma 100-400mm f/5-6.3 DG DN OS Contemporary - Sony FE

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About the Sigma 100-400mm f/5-6.3 DG DN OS Contemporary - Sony FE

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