7artisans Photoelectric 4mm T2.8 Circular Fisheye Lens
The 7artisans 4mm f/2.8 Circular Fisheye is a 4mm f/2.8 lens designed for Micro Four Thirds mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
7artisans Photoelectric 4mm T2.8 Circular Fisheye Lens
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Lens Overview — 7artisans 4mm f/2.8 Circular Fisheye
Key Features — 7artisans 4mm f/2.8 Circular Fisheye
4mm Circular Fisheye: Fixed 4mm focal length produces a full circular image projection with an extreme wide-angle field of view on Micro Four Thirds sensors.
T2.8 Maximum Aperture: A T2.8 maximum aperture (measured in transmission) keeps the lens usable in moderate to low-light conditions for a specialty fisheye design.
Micro Four Thirds Mount: Natively compatible with the broad range of MFT mirrorless bodies from Olympus, OM System, Panasonic, and others.
Manual Focus Design: Direct tactile control over focus distance with no autofocus system, suited to deliberate, creative shooting workflows.
Lightweight 201g Build: At just 201 grams, the lens adds minimal payload, making it practical for travel, drone-adjacent rigs, or compact camera setups.
Prime Optical Design: Fixed focal length construction means the optics are purpose-built for the fisheye focal length rather than adapted from a zoom design.
Lens Specifications — 7artisans 4mm f/2.8 Circular Fisheye
| Spec | Detail |
|---|---|
| Use Cases | Astrophotography, Travel, Video / Cinematography, Creative Effects |
| Lens Type | Fisheye |
| Format | Micro Four Thirds (MFT) |
| Zoom/Prime | Prime |
| Focal Length | 4mm |
| Maximum Aperture | f/2.8 |
| Camera System | Mirrorless |
| Lens Mount | Micro Four Thirds |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Weight | 201g |
Description — 7artisans 4mm f/2.8 Circular Fisheye
The 7artisans Photoelectric 4mm T2.8 Circular Fisheye Lens is a prime, manual focus fisheye lens built for Micro Four Thirds mirrorless cameras. Its fixed 4mm focal length places it squarely in the wide angle category, delivering the distinctive circular fisheye projection that makes this type of lens a unique creative instrument. The T2.8 maximum aperture provides a bright enough opening to work across varied lighting conditions.
Weighing in at just 201 grams, this lens is impressively light, keeping your overall kit weight down whether you are shooting handheld or mounting to a compact rig. There is no autofocus — focus is entirely manual, which suits deliberate, considered shooting styles and gives you direct control without electronic dependence. The lens has no image stabilization and no filter thread, so shooters should plan accordingly.
Compatible with the Micro Four Thirds (MFT) lens mount, it slots natively into the broad ecosystem of MFT-system mirrorless bodies, making it an accessible specialty option for photographers already invested in that system.
Pros — 7artisans 4mm f/2.8 Circular Fisheye
- ✓Lightweight at just 201g, making it easy to carry and suitable for weight-sensitive setups
- ✓T2.8 maximum aperture provides a reasonably bright opening for a specialty fisheye prime
- ✓Dedicated Micro Four Thirds mount ensures direct, native compatibility with MFT mirrorless systems
Cons — 7artisans 4mm f/2.8 Circular Fisheye
- ✗Manual focus only — no autofocus support for fast-moving or spontaneous shooting situations
- ✗No image stabilization, which can be a challenge in handheld low-light use
- ✗No filter thread means standard screw-on filters cannot be attached
Videos — 7artisans 4mm f/2.8 Circular Fisheye
7artisans 7.5mm F2.8 Fisheye Mark II Review — Arthur R
Frequently Asked Questions — 7artisans 4mm f/2.8 Circular Fisheye
What camera mount does this lens fit?+
This lens is designed for the Micro Four Thirds (MFT) lens mount, making it compatible with MFT-system mirrorless cameras. It is listed under the Micro Four Thirds (MFT) lens format in the specifications.
Does this lens have autofocus?+
No. The lens is manual focus only, with no autofocus capability. All focus adjustments must be made by hand using the focus ring.
How much does the lens weigh?+
The lens weighs 201 grams, making it quite compact and lightweight for its type. This can be beneficial when used on lightweight mirrorless bodies or in situations where minimizing weight is important.
Can I attach filters to this lens?+
No. The specifications indicate that the filter thread size is null, meaning this lens does not have a standard filter thread for attaching screw-on filters.
Does this lens have image stabilization?+
No. The lens has no built-in image stabilization. Any stabilization would need to come from in-body stabilization if your camera body supports it.
Is this a zoom or prime lens?+
This is a prime lens with a fixed focal length of 4mm. It does not zoom, and both the minimum and maximum focal length values in the specifications are 4mm.