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Sigma 18-50mm f/2.8 DC DN C (Contemporary) Autofocus APS-C Lens for Canon RF-Mount, Black {55}
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Sigma's compact f/2.8 standard zoom built for APS-C mirrorless.
The 18-50mm f/2.8 DC DN Contemporary covers a focal range that translates to roughly 29-80mm equivalent on Canon RF APS-C bodies, giving you a wide-to-short-tele spread with a constant f/2.8 aperture throughout. That fixed maximum aperture matters most when light drops or when you need consistent exposure across a zoom range without touching the shutter or ISO. The DC DN designation means the optical formula was designed from the ground up for short-flange mirrorless systems, not adapted from a DSLR-era design.
The 55mm filter thread keeps front accessories reasonably compact, fitting this lens's overall character as a travel-friendly everyday zoom. Autofocus is native to the RF mount, so there's no speed penalty or compatibility guesswork. For shooters who want the creative control of f/2.8 across a practical focal range without hauling a full-frame kit, this lens makes the case that APS-C mirrorless doesn't require optical compromises.
Who It's For
Street photographers working Canon RF APS-C bodies get a constant f/2.8 that holds at 50mm when the light gets difficult in the late afternoon or indoor markets. Travel shooters benefit from the single-lens solution covering wide environmental shots at 18mm through tighter subject framing at 50mm. Video creators on run-and-gun shoots gain consistent aperture so exposure doesn't shift mid-zoom. Documentary and event photographers who need autofocus reliability with low-light capability without carrying multiple primes will find the focal range well-suited to unpredictable situations.
Key Features
- Constant f/2.8 aperture across 18-50mm focal range
- DC DN design optimized for APS-C mirrorless
- Canon RF native autofocus with no speed penalty
- 55mm filter thread for compact accessory compatibility
- 29-80mm equivalent reach on Canon RF APS-C
- Contemporary optical formula
FAQ
- What's the effective focal length on Canon RF APS-C bodies?
- 18-50mm translates to approximately 29-80mm equivalent, covering wide to short-telephoto on the smaller sensor.
- Does the aperture stay at f/2.8 across the entire zoom range?
- Yes, the constant f/2.8 maximum aperture holds throughout 18-50mm, so you won't need to compensate exposure when zooming in lower light.
- Why does the DC DN designation matter?
- The optical formula was designed specifically for the shorter flange distance of mirrorless cameras, not adapted from a DSLR design, so you get better optical performance at the lens mount.
- Will autofocus work natively on Canon RF APS-C bodies?
- Yes, autofocus is native to the RF mount with no speed penalty or compatibility issues.
- What size filters does this lens take?
- 55mm filters and accessories, keeping the overall package compact.
- Is this lens built for full-frame or APS-C?
- APS-C only. The DC DN design optimizes image circle and size for APS-C mirrorless systems, not full-frame RF bodies.
| Specification | Value |
|---|---|
| Focal Length | 18-50mm |
| Max Aperture | f/2.8 |
| Mount | Canon RF |
| Filter Thread | 55mm |
This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.
| Brand Name | Sigma |
|---|---|
| Filter Size | 55mm |
| Lens Mount | Canon EOS RF |
| Max Focal Length | 50mm |
| Min Focal Length | 18mm |
