Sony’s cheapest fast full-frame lens. The FE 50mm f/1.8 gives you background blur and two to three stops more light than a kit zoom for very little money — with the caveat that its autofocus is slow and noisy by modern standards.
Key specs
What’s a good price?
This item mostly sells near list price, with dips during manufacturer rebates (often Black Friday through the holidays, and spring). A good price is anything at or near its 90-day low on a price tracker such as Keepa or camelcamelcamel. We’ll add it to our price drops list when a meaningful discount appears.
What’s good — and what isn’t
Strengths
- Very low price for a full-frame f/1.8
- Small and light
- Sharp enough stopped down to f/2.8–f/4
- Natural, versatile field of view (≈75mm on APS-C)
Trade-offs
- Slow, audible autofocus — poor for video and fast-moving kids
- Hunts in low light
- No weather sealing, plastic mount
Who it’s for
Beginners on a tight budget who want a fast prime for portraits, food and low light — mostly stills.
Alternatives
| Alternative | Why consider it |
|---|---|
| Sony FE 50mm f/1.4 GM | Much better AF and rendering, much more money |
| Viltrox AF 50mm f/1.8 FE | Similar price, faster stepping-motor AF |
| Sigma 30mm f/1.4 DC DN | Better choice on APS-C bodies (≈45mm, f/1.4) |
| Sony FE 85mm f/1.8 | Better portrait lens with fast, quiet AF |
FAQ
Is the Sony FE 50mm f/1.8 good on an a6400?
It works well for portraits (≈75mm field of view), but on APS-C the Sigma 30mm f/1.4 is usually the better buy: brighter, sharper and a more useful everyday focal length.
Why is the FE 50mm f/1.8 autofocus slow?
It uses an older DC motor that moves a relatively heavy focusing group. Later Sony lenses use faster linear or stepping motors.
Related: Sony E-mount guide · Black Friday lens deals · All lenses