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Canon
Canon EF 50mm f/1.8 STM prime lens International Model
A compact normal prime with a bright f/1.8 aperture for low-light shooting and shallow depth of field, plus near-silent STM autofocus for video and stills
- TypeZoom Lens
- Bright f/1.8 aperture for low-light shooting and shallow depth of field
- STM stepping motor gives near-silent continuous AF for video and smooth focus for stills
- 50mm focal length on full-frame, 80mm equivalent on APS-C for versatile framing
- Super Spectra coating reduces flare and ghosting for higher contrast in harsh light
- Minimum focus distance 1.15 ft (0.35 m) with 0.21x magnification for close-up detail
Canon EF 50mm f/1.8 STM prime lens
The Canon EF 50mm f/1.8 STM is a compact normal-length prime designed for full-frame EF-mount DSLRs and also usable on APS-C bodies where it provides an 80mm equivalent focal length. It suits photographers who want a bright, lightweight lens for everyday shooting, portraits, action and low-light scenes. The bright f/1.8 maximum aperture enables shallow depth of field and low-light capability. It is not for buyers who need zoom flexibility or wider focal lengths.
Thermals noise and power draw
As a passive optical lens without electronic cooling or motorised zoom, it generates no operational heat and draws negligible power from the camera body. The STM stepping motor operates near-silently during autofocus, making it suitable for video recording where microphone pickup is a concern. There are no fans, pumps or active thermal components to create noise.
Maximum aperture f/1.8
The f/1.8 maximum aperture is the single specification that determines whether this lens meets the need for shallow depth of field and low-light performance. It provides significant light-gathering advantage over slower kit zooms and enables subject isolation for portraits. If the shooting scenario demands a wider maximum aperture such as f/1.4 or f/1.2, this model will not satisfy that requirement.
Highlights
- Bright f/1.8 aperture for low-light shooting and shallow depth of field
- STM stepping motor gives near-silent continuous AF for video and smooth focus for stills
- 50mm focal length on full-frame, 80mm equivalent on APS-C for versatile framing
- Super Spectra coating reduces flare and ghosting for higher contrast in harsh light
- Minimum focus distance 1.15 ft (0.35 m) with 0.21x magnification for close-up detail
Specifications
| Type | Zoom Lens |
|---|---|
| Brand | Canon International |
| Model | Not Available |
Questions about this item
How do I mount the EF 50mm f/1.8 STM on my Canon DSLR and which step is often missed?
Align the red dot on the lens barrel with the red dot on the EF mount, twist clockwise until it clicks, then set the focus mode switch to AF so the STM motor can drive focus; forgetting the switch leaves the lens in manual focus only.
What part of this lens will need service or replacement after extended use?
The STM stepping motor and the electronic focus-by-wire system are the only moving parts subject to wear; the six-element optical group with Super Spectra coating and the fixed f/1.8 aperture have no serviceable components.
At what magnification does this 50mm prime stop focusing closer?
Maximum magnification is 0.21x, reached at the minimum focusing distance of 0.35 m; beyond that point the lens cannot focus any closer regardless of the STM motor's travel.
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