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Yongnuo YN 42.5mm f/1.7 M II Lens

The Yongnuo YN 42.5mm f/1.7 M II is a 42.5mm f/1.7 lens designed for Micro Four Thirds mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Yongnuo YN 42.5mm f/1.7 M II Lens

Yongnuo YN 42.5mm f/1.7 M II Lens

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Lens Overview — Yongnuo YN 42.5mm f/1.7 M II

The Yongnuo YN 42.5mm f/1.7 M II is a prime lens built for Micro Four Thirds mirrorless cameras, offering a fixed 42.5mm focal length and a wide maximum aperture of f/1.7. Designed around the Micro Four Thirds lens format and mount, it fits seamlessly into the MFT mirrorless ecosystem and supports both autofocus and manual focus operation. At just 146g, this lens is notably lightweight, making it a practical everyday carry option for photographers who value a compact kit without sacrificing a fast aperture.

The f/1.7 maximum aperture opens the door to shooting in lower-light conditions and gives photographers control over depth of field for more subject-isolating images. A 52mm filter thread provides compatibility with a wide range of standard filters, from UV protection to circular polarizers. The lens is categorized in the standard focal length range, making it a versatile choice for general shooting including portraits, street photography, and everyday subjects.

Image stabilization is listed as none in the specifications, so users will need to rely on in-body stabilization if their camera body provides it. The combination of autofocus capability, a fast aperture, and a featherweight build positions this lens as an accessible and practical prime for MFT shooters.

Key Features — Yongnuo YN 42.5mm f/1.7 M II

42.5mm Prime Focal Length: Equivalent to an 85mm field of view on full-frame, making it well-suited for portraits and street photography on MFT bodies.

f/1.7 Maximum Aperture: Wide aperture allows for shooting in low-light conditions and enables shallow depth of field for subject separation.

Micro Four Thirds Mount: Native MFT mount ensures full electronic communication with compatible Olympus and Panasonic mirrorless bodies.

Autofocus Support: Built-in autofocus motor enables reliable subject tracking and fast acquisition without requiring an adapter.

Manual Focus Option: Switchable manual focus control gives photographers direct, hands-on focus adjustment when precision is needed.

146g Lightweight Build: Compact and featherweight construction keeps the overall kit portable for everyday and travel use.

Lens Specifications — Yongnuo YN 42.5mm f/1.7 M II

Yongnuo YN 42.5mm f/1.7 M II full specifications
SpecDetail
Use CasesTravel
Lens TypePrime
FormatMicro Four Thirds (MFT)
Zoom/PrimePrime
Focal Length42.5mm
Maximum Aperturef/1.7
Camera SystemMirrorless
Lens MountMicro Four Thirds
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationNone
Filter Thread52mm

Description — Yongnuo YN 42.5mm f/1.7 M II

The Yongnuo YN 42.5mm f/1.7 M II is a prime lens designed exclusively for Micro Four Thirds mirrorless cameras, featuring a 42.5mm fixed focal length and a fast f/1.7 maximum aperture. Its wide aperture makes it well-suited for photographers looking to shoot in lower-light situations or achieve a shallower depth of field for subject isolation. Weighing just 146g, the lens is impressively compact and lightweight without compromising on aperture speed, making it a practical choice for everyday use, travel, or street photography.

Both autofocus and manual focus are supported, providing flexible control depending on your shooting style or subject. The 52mm filter thread is a standard size, giving easy access to a wide variety of filter types. Image stabilization is not included, so photographers shooting handheld in low light should factor in whether their camera body offers stabilization support. Designed in the standard focal length range, this prime covers a versatile middle ground that suits portraiture, general subjects, and close-up work alike.

Pros — Yongnuo YN 42.5mm f/1.7 M II

  • ✓Wide maximum aperture of f/1.7 enables shooting in challenging light and shallow depth-of-field control
  • ✓Very lightweight at just 146g, keeping the overall kit compact and travel-friendly
  • ✓Supports both autofocus and manual focus, giving shooters flexible control options

Cons — Yongnuo YN 42.5mm f/1.7 M II

  • ✗No image stabilization is present, requiring reliance on in-body stabilization where available
  • ✗Fixed 42.5mm focal length offers no zoom flexibility for framing adjustments
  • ✗As a third-party lens, long-term autofocus compatibility with future MFT bodies is not guaranteed

Videos — Yongnuo YN 42.5mm f/1.7 M II

Yongnuo 42.5mm f1.7 Mark II, finally a good lens? - RED35 Review — Jimmy Cheng (RED35)

Resources & Downloads — Yongnuo YN 42.5mm f/1.7 M II

Manuals & Guides

Frequently Asked Questions — Yongnuo YN 42.5mm f/1.7 M II

What camera mount does the Yongnuo YN 42.5mm f/1.7 M II use?+
This lens uses the Micro Four Thirds mount, making it compatible with MFT-system mirrorless cameras. It is designed specifically for the Micro Four Thirds lens format.
Does this lens have image stabilization?+
No. The specifications list image stabilization as none. If optical stabilization is important to your shooting, you would need to rely on in-body image stabilization if your camera body supports it.
What is the maximum aperture of this lens?+
The maximum aperture is f/1.7, which allows for shooting in lower-light environments and gives photographers the ability to achieve a shallower depth of field for subject separation.
Does this lens support autofocus?+
Yes. The lens supports both autofocus and manual focus modes. The focus type is listed as both auto and manual in the specifications.
What filter size does this lens use?+
The Yongnuo YN 42.5mm f/1.7 M II has a 52mm filter thread, which is a common size with wide availability across most filter brands and types.
How heavy is this lens?+
The lens weighs 146g, making it one of the lighter prime options for Micro Four Thirds systems and well-suited for photographers who prioritize a compact and portable setup.

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