Sigma
100-400mm F5-6.3 DG DN OS Contemporary
Sony E Mount
100-400mm F5-6.3 DG DN OS Contemporary — 100–400mm f/5-6.3 for Sony E, a popular choice in the sigma lineup.
$949
Launch priceReleased Jul 2020
Sigma
18-50mm F2.8 DC DN Contemporary
Fujifilm X Mount
18-50mm F2.8 DC DN Contemporary — 18–50mm f/2.8 for Fujifilm X, a popular choice in the sigma lineup.
$549
Launch priceReleased Apr 2023
18-50mm F2.8 DC DN Contemporary is 2.8 years newer.
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Wins
100-400mm F5-6.3 DG DN OS Contemporary
Wins
18-50mm F2.8 DC DN Contemporary
TL;DR — Key differences
- A100-400mm F5-6.3 DG DN OS Contemporary has higher OIS effectiveness (5 stops vs 0 stops)
- B18-50mm F2.8 DC DN Contemporary has lower Weight (285 g vs 1140 g)
- B18-50mm F2.8 DC DN Contemporary has lower Min focus distance (12 cm vs 38 cm)
- B18-50mm F2.8 DC DN Contemporary has lower Length (76.8 mm vs 210 mm)
- B18-50mm F2.8 DC DN Contemporary has lower Max aperture (Tele) (f/2.8 vs f/6.3)
Key specs at a glance
Size and weight, to scale
100-400mm F5-6.3 DG DN OS Contemporary
⌀81 × 210 mm
1140 g (2.51 lb / 40.21 oz)
Credit card
85.6 × 54 mm
for scale
18-50mm F2.8 DC DN Contemporary
⌀65 × 77 mm
285 g (0.63 lb / 10.05 oz)
100-400mm F5-6.3 DG DN OS Contemporary is 133mm longer and 17mm wider than 18-50mm F2.8 DC DN Contemporary.
100-400mm F5-6.3 DG DN OS Contemporary is 855 g heavier than 18-50mm F2.8 DC DN Contemporary.
Diameter (⌀) is the maximum barrel width; length is measured from the mount to the front of the lens.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose the 100-400mm F5-6.3 DG DN OS Contemporary
- ✓
Special elements
Adds Aspherical
- ✓
OIS effectiveness
5 stops vs 0 stops — higher is better
- ✓
Optical stabilization
Only 100-400mm F5-6.3 DG DN OS Contemporary supports it
- ✓
Weather sealing
Only 100-400mm F5-6.3 DG DN OS Contemporary supports it
- ✓
Control ring
Only 100-400mm F5-6.3 DG DN OS Contemporary supports it
Reasons to choose the 18-50mm F2.8 DC DN Contemporary
- ✓
Special elements
Adds 1 SLD, 3 Aspherical
- ✓
Weight
285 g vs 1140 g — lower is better
- ✓
Min focus distance
12 cm vs 38 cm — lower is better
- ✓
Length
76.8 mm vs 210 mm — lower is better
- ✓
Max aperture (Tele)
f/2.8 vs f/6.3 — lower is better
- ✓
Max aperture (Wide)
f/2.8 vs f/5 — lower is better
- ✓
Diameter
64.5 mm vs 81 mm — lower is better
- ✓
Max magnification
0.36 × vs 0.25 × — higher is better
Shared specifications
Internal focus
Both support internal focus
Pros & cons at a glance
Editorially curated highlights and trade-offs.
100-400mm F5-6.3 DG DN OS Contemporary
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Built-in optical image stabilization
- ✓Weather-sealed construction for outdoor shooting
Cons
- –Relatively heavy for extended handheld use
- –Slower maximum aperture limits low-light performance
18-50mm F2.8 DC DN Contemporary
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Lightweight design easy to carry all day
- ✓Native Fujifilm X mount compatibility
Cons
- –Third-party or older alternatives may offer better value
Decided which one is right for you?
Compare live prices for the 100-400mm F5-6.3 DG DN OS Contemporary and 18-50mm F2.8 DC DN Contemporary at major authorized retailers.
Sigma 100-400mm F5-6.3 DG DN OS Contemporary
Sigma 18-50mm F2.8 DC DN Contemporary
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.