The Sony A6400 is a popular APS-C camera with excellent autofocus, and the kit lens holds it back more than anything else. Upgrading the glass is the fastest way to unlock its potential.
We compared bright primes and versatile zooms from Sony and third parties, weighing sharpness, autofocus, and value for this compact body.
| Lens | Best For | Research Score | Buy |
|---|---|---|---|
| Sigma 18-50mm f/2.8 DC DNBest Overall |
APS-C E-mount standard zoom, constant f/2.8. | 90/100 | Check Price |
| Tamron 17-70mm f/2.8 Di III-A VC RXDBest All-Rounder |
APS-C E-mount zoom, constant f/2.8, stabilized. | 87/100 | Check Price |
| Sigma 16mm f/1.4 DC DNBest Wide Prime |
APS-C E-mount wide prime, f/1.4. | 85/100 | Check Price |
| Sony E 35mm f/1.8 OSSBest Everyday Prime |
APS-C E-mount standard prime, f/1.8, stabilized. | 84/100 | Check Price |
 Sony E 15mm f/1.4 GBest for Video |
APS-C E-mount wide prime, f/1.4. | 81/100 | Check Price |
 Sony E 55-210mm f/4.5-6.3 OSSBest Budget Telephoto |
APS-C E-mount telephoto zoom, stabilized. | 75/100 | Check Price |
Detailed Reviews and Top Picks
1. Sigma 18-50mm f/2.8 DC DN
90/100
Best Overall
Key spec: APS-C E-mount standard zoom, constant f/2.8.
This Sigma is the single best upgrade for the A6400, swapping the dim kit lens for a bright, sharp constant f/2.8 zoom that is barely larger. It transforms everyday and low-light shooting. It has no stabilization and a modest range, so travelers who want one lens for everything may prefer the Tamron below.
- Constant f/2.8 in a tiny body
- Sharp across the frame
- Excellent value
Pros
- Bright aperture for the size
- Huge upgrade over the kit lens
- Very affordable
Cons
- No stabilization
- Short zoom range
2. Tamron 17-70mm f/2.8 Di III-A VC RXD
87/100
Best All-Rounder
Key spec: APS-C E-mount zoom, constant f/2.8, stabilized.
If you want one lens on the A6400 most of the time, this Tamron covers wide to short telephoto at a constant f/2.8 with stabilization, which is rare at the price. It is the natural travel choice. It is bigger than a prime and shows some wide-end distortion, so those who want a tiny kit should look at the Sigma.
- Huge wide-to-tele range
- Constant f/2.8 with stabilization
- Great single-lens travel option
Pros
- Very versatile range
- Built-in stabilization
- Bright throughout
Cons
- Larger and heavier than primes
- Some wide-end distortion
3. Sigma 16mm f/1.4 DC DN
85/100
Best Wide Prime
Key spec: APS-C E-mount wide prime, f/1.4.
This 16mm is a favorite value prime for the A6400, offering a bright f/1.4 aperture and a versatile wide view for street, astro, and vlogging. It punches above its price. It is a bit chunky and shows some fringing wide open, so those who want the most pocketable setup may prefer a smaller prime.
- Very bright aperture
- Useful 24mm equivalent view
- Strong value
Pros
- Excellent low-light ability
- Great for astro and vlogging
- Sharp for the price
Cons
- Larger than Sony compact primes
- Some fringing wide open
4. Sony E 35mm f/1.8 OSS
84/100
Best Everyday Prime
Key spec: APS-C E-mount standard prime, f/1.8, stabilized.
This 35mm gives the A6400 a natural standard view with stabilization, making it a lovely everyday and portrait prime in a compact size. It is an easy lens to carry daily. It is not weather sealed and is a touch slower than f/1.4 options for astro, but for general use it is a delight.
- Natural 50mm equivalent view
- Optical stabilization
- Compact and light
Pros
- Great everyday and portrait lens
- Stabilized for handheld
- Fast, quiet focus
Cons
- Not weather sealed
- Modest for astro versus f/1.4
5. Sony E 15mm f/1.4 G
81/100
Best for Video
Key spec: APS-C E-mount wide prime, f/1.4.
For video and vlogging on the A6400, this 15mm G prime stays bright and shows little focus breathing, which suits creators who talk to camera. It is a compact, high-quality choice. The wide perspective is not flattering for headshots, so portrait shooters will want a longer prime.
- Wide, bright field of view
- Smooth aperture ring for video
- Minimal focus breathing
Pros
- Excellent for vlogging and interiors
- Bright for low light
- Compact G-series build
Cons
- Wide view not ideal for portraits
- G-series price
6. Sony E 55-210mm f/4.5-6.3 OSS
75/100
Best Budget Telephoto
Key spec: APS-C E-mount telephoto zoom, stabilized.
This 55-210mm is the budget way to add telephoto reach to the A6400 for sports, wildlife, and events. It is light and stabilized. The slow aperture and softer long end mean it is best in good light, so serious telephoto shooters will want the sharper 70-350mm G instead.
- Affordable telephoto reach
- Optical stabilization
- Light and compact
Pros
- Cheap way to add reach
- Stabilized for handheld
- Small for a telephoto
Cons
- Slow variable aperture
- Softer at the long end
Frequently Asked Questions
The Sigma 18-50mm f/2.8 DC DN is the best first upgrade, replacing the kit lens with a bright, sharp zoom in a compact body. For one lens that covers more range, the Tamron 17-70mm f/2.8 is the versatile choice.
The kit lens is convenient but dim and soft, and it is the main thing holding the A6400 back. Even an affordable upgrade like the Sigma 18-50mm or a bright prime makes a noticeable difference.
Yes, full-frame FE lenses mount and work fully with a 1.5x crop to the field of view. They can be larger than needed, but they are useful if you plan to move to full frame later.
The wide, bright Sony E 15mm f/1.4 G is excellent for vlogging thanks to its field of view and minimal focus breathing. The stabilized Sigma 16mm f/1.4 is a strong value alternative.
Our Verdict
The Sigma 18-50mm f/2.8 DC DN is our top pick for the A6400 thanks to its bright aperture, sharpness, and value, while the Tamron 17-70mm f/2.8 is the runner up and the best single stabilized lens for travel.