Panasonic G 20mm F1.7 ASPH Lens Review

The Panasonic G 20mm F1.7 ASPH Lens is a compact and lightweight prime lens designed for Micro Four Thirds cameras. With its wide maximum aperture of f/1.7, this lens offers excellent low-light performance and allows for creative depth of field control.

The lens construction consists of seven elements in five groups, including two aspherical elements that effectively reduce spherical and chromatic aberrations, resulting in sharp and high-contrast images.

Key Specs

  • Focal Length: 20mm
  • 35mm Equivalent Focal Length: 40mm
  • Maximum Aperture: f/1.7
  • Minimum Aperture: f/16
  • Lens Mount: Micro Four Thirds
  • Format Compatibility: Micro Four Thirds
  • Angle of View: 57 degrees
  • Minimum Focus Distance: 0.2m / 0.66ft
  • Maximum Magnification: 0.13x
  • Lens Elements: 7
  • Lens Groups: 5
  • Diaphragm Blades: 7
  • Image Stabilization: No (Compatible with in-body stabilization)
  • Autofocus: Yes
  • Filter Thread Size: 46mm
  • Dimensions (DxL): Approx. 63.5 x 25.5mm / 2.5 x 1.0in
  • Weight: Approx. 87g / 3.1oz


In a wide range of shooting conditions, the Panasonic G 20mm F1.7 ASPH Lens produces exceptional results. Because of the large maximum aperture, the camera is capable of high shutter speeds, which makes it an excellent choice for capturing moving scenes with clear details.

Even when utilized with the aperture wide open at f/1.7, the lens maintains an exceptional level of sharpness, and the image quality is dependably superb over the entirety of the frame. Because of its circular seven-blade aperture design, it is capable of producing vivid colors and has a depiction of out-of-focus areas that is attractive to the eye.

Autofocus System

The autofocus (AF) mechanism of the lens is designed to operate at a fast speed, allowing for precise and speedy focusing. Since the AF motor has a quiet operation, it is ideal for use in applications involving both photography and video. The lens makes use of a technique called Depth From Defocus (DFD) developed by Panasonic.

This technology determines the distance to the subject by comparing two areas that are out of focus. This results in an autofocus performance that is both quick and precise, even when dealing with adverse lighting situations or subjects that are moving in an unpredictable manner.

Vibration Reduction

Although it does not have optical image stabilization (OIS) built-in, the Panasonic G 20mm F1.7 ASPH Lens is compatible with the in-body image stabilization (IBIS) systems that are available in many Micro Four Thirds cameras.

This makes it possible to effectively reduce camera shaking, which is especially helpful when shooting handheld in low-light conditions or while utilizing shorter shutter speeds. As a consequence of the combination of the large aperture of the lens and the IBIS of the camera, clear and blur-free photos are produced, reducing the necessity for the use of a tripod in many different situations.

Build Quality

The lens is created with high-quality materials, which ensures that it will be long-lasting and durable. It features a sturdy mount made of metal that ensures a safe connection to the main body of the camera.

The entire build quality instills a sense of assurance, and the lens has a solid weight to it when held. Because of its small size and low weight, it has a very portable design, which enables photographers to carry it about for extended periods of time without experiencing any discomfort.

Handling and Ergonomics

The ergonomics and ease of usage of the Panasonic G 20mm F1.7 ASPH Lens were taken into consideration during the design process. It boasts a manual focus ring that is both smooth and accurate, allowing for quick changes that are also quite precise.

Both manual focusing and zone focusing strategies benefit from the lens barrel’s inclusion of a distance scale and a depth of field scale. These scales provide valuable reference points for the respective procedures. In addition, the lens possesses a separate aperture ring that enables the user to exercise direct control over the lens’s aperture settings.

Image Stabilization

A built-in optical image stabilization system is not included with the Panasonic G 20mm F1.7 ASPH Lens. This was already discussed previously. On the other hand, it is only capable of providing reliable image stabilization when coupled with a suitable camera body that possesses IBIS.

The combination of lens and camera stabilization helps to correct for camera shake, which ultimately results in clearer photos. This is especially beneficial when shooting in low-light circumstances or when utilizing slower shutter speeds.

Shooting Experience

Because of its little size and lightweight construction, the Panasonic G 20mm F1.7 ASPH Lens creates a shooting experience that is both satisfying and enjoyable. It has a good balance when attached to Micro Four Thirds cameras, which makes shooting handheld more comfortable.

The large maximum aperture of f/1.7 provides creative adjustment of depth of focus, allowing photographers to generate lovely background blur while isolating subjects in their photographs. Due to the lens’ exceptional performance in low light, it may be used for a variety of genres of photography, such as portraiture, street photography, and even shooting in interior environments.

Image Quality

The image quality produced by the lens is remarkable over the entirety of its aperture range. Even when shooting with the aperture wide open at f/1.7, the lens maintains great clarity in the middle of the frame and has exceptional performance all the way to the frame’s edges.

Sharpness can be improved even more by closing the aperture, and it reaches its maximum level somewhere between f/4 and f/8. The lens has good control over chromatic aberrations and produces just a small amount of distortion overall. The colors are vivid and precisely represented, and the contrast as well as the micro-contrast, are attractive, giving the photos a sense of depth.

Teleconverter Compatibility

Unfortunately, the Panasonic G 20mm F1.7 ASPH Lens is not officially compatible with any teleconverters. However, it is possible to adapt the lens to a variety of mounts or connect teleconverters by making use of adapters that are sold by third-party manufacturers.

It is essential to be aware that employing teleconverters may have an effect on the image quality, the speed of the autofocus, and the general performance of the camera; thus, careful evaluation and testing are required.

Comparison with Competitors

In contrast to other lenses in its class, the Panasonic G 20mm F1.7 ASPH Lens distinguishes out thanks to its little form factor, lightweight construction, and outstanding optical performance. When photographing in low light or trying to achieve a shallow depth of focus, its wide maximum aperture of f/1.7 is extremely useful. The focusing function of the lens is quick and precise, which ensures that it will operate reliably in a variety of different shooting scenarios.

The Panasonic G 20mm F1.7 ASPH Lens compensates for the absence of a built-in optical image stabilization system by being compatible with the in-body image stabilization systems available in many Micro Four Thirds cameras. While other lenses in this focal length range may feature built-in optical image stabilization, the Panasonic G 20mm F1.7 ASPH Lens does not.


Focal Length20mm
35mm Equivalent Focal Length40mm
Maximum Aperturef/1.7
Minimum Aperturef/16
Lens MountMicro Four Thirds
Format CompatibilityMicro Four Thirds
Angle of View57 degrees
Minimum Focus Distance0.2m / 0.66ft
Maximum Magnification0.13x
Lens Elements7
Lens Groups5
Diaphragm Blades7
Image StabilizationNo (Compatible with in-body stabilization)
Filter Thread Size46mm
Dimensions (DxL)Approx. 63.5 x 25.5mm / 2.5 x 1.0in
WeightApprox. 87g / 3.1oz

Pros and Cons


  • Design that is both condensed and lightweight.
  • Largest possible aperture, allowing for exceptional performance in low light as well as creative flexibility over the depth of focus.
  • Exceptional picture quality, with excellent crispness and almost little distortion.
  • Performance in autofocus that is prompt and precise
  • Compatibility with in-body image stabilization systems Ergonomic design and user-friendly handling


  • Absence of an optical picture stabilization system integrated in
  • Insufficient compatibility with teleconverters
  • When used wide open with an aperture of f/1.7, there is a possibility of exhibiting some vignetting.

Price and Availability

The Panasonic G 20mm F1.7 ASPH Lens has pricing that is comparable to other products in its category and provides great value considering its capabilities.

As a result of its widespread availability at authorized merchants as well as online platforms, it is exceptionally convenient for photographers and videographers to use.


The Panasonic G 20mm F1.7 ASPH Lens is an excellent prime lens for Micro Four Thirds cameras. It provides outstanding performance in a design that is both compact and lightweight, making it an ideal accessory for traveling photographers. It is a fantastic choice for a broad variety of photographic styles because to its large maximum aperture, which, when paired with its high picture quality and quick focusing, makes it a very adaptable camera.

Even though the lens does not have optical image stabilization built in, it is compatible with in-body image stabilization systems, which eliminates the possibility of blurry photos and ensures images that are clear and distinct. The Panasonic G 20mm F1.7 ASPH Lens is a wonderful addition to any Micro Four Thirds camera kit because of its sturdy build quality, user-friendly handling, and reasonable price point. This lens gives photographers the ability to produce breathtaking photos with ease while maintaining full creative control.

Panasonic G 20mm F1.7 ASPH Lens FAQs

Q. Is the Panasonic G 20mm F1.7 ASPH Lens compatible with all Micro Four Thirds cameras?
A. Yes, the Panasonic G 20mm F1.7 ASPH Lens is designed for Micro Four Thirds cameras and is compatible with all cameras that use this lens mount.
Q. Does the lens have built-in optical image stabilization?
A. No, the Panasonic G 20mm F1.7 ASPH Lens does not have built-in optical image stabilization. However, it is compatible with the in-body image stabilization (IBIS) systems found in many Micro Four Thirds cameras.
Q. Can I use this lens for portraits and low-light photography?
A. Absolutely! The lens’s wide maximum aperture of f/1.7 makes it well-suited for portrait photography, allowing you to achieve a shallow depth of field and beautifully blurred backgrounds. Its wide aperture also enhances its low-light performance, making it ideal for capturing images in challenging lighting conditions.
Q. Does the lens support manual focus?
A. Yes, the Panasonic G 20mm F1.7 ASPH Lens supports manual focus. It features a smooth and precise manual focus ring, enabling photographers to make precise adjustments when desired.
Q. What accessories are included with the lens?
A. When you purchase the Panasonic G 20mm F1.7 ASPH Lens, it typically comes with lens caps (front and rear) to protect the lens elements. Additionally, some retailers may offer lens hoods and carrying cases as part of a package deal, but it’s best to check with the specific retailer or package contents to confirm the included accessories.

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