Buy the M.Zuiko 45mm f/1.8 if you want a tiny, inexpensive-to-carry 90mm-equivalent prime and usually photograph in adequate light. Choose the 45mm f/1.2 PRO if portraits, available-light work, weather exposure, or maximum subject separation justify carrying a lens that is about 3.5 times heavier. Both lenses produce the same basic perspective and framing. The decision is mainly about aperture, handling, protection, and portability rather than focal length.
The short answer
Both lenses are 45mm Micro Four Thirds primes. On a Micro Four Thirds camera, each gives the angle of view associated with a 90mm lens on a 35mm-format camera, and both list a 27-degree angle of view. At ordinary portrait distances, your composition will look very similar with either lens.
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The less expensive-to-carry option is the 45mm f/1.8. It weighs 116g, measures 56 × 46mm, and uses 37mm filters. It is easy to leave on a small body, pack as a second lens, or carry all day without building your kit around it.
The 45mm f/1.2 PRO is a specialist choice. Its one-stop-wider aperture can reduce ISO or permit a faster shutter in dim light, while also producing more separation at the same focus distance. In return, the lens weighs 410g without its hood and cap, measures 70 × 84.9mm, uses 62mm filters, and costs more to transport and support. OM SYSTEM describes it as splashproof and dustproof and adds controls that the smaller lens does not have.
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What is the same about the two lenses?
Identical focal length and portrait perspective
A 45mm focal length on Micro Four Thirds gives a 90mm-equivalent field of view. That is a useful portrait range: it is tighter than a normal lens, but not so long that you must stand far away for a head-and-shoulders frame. Changing from one lens to the other does not change that basic perspective. Your camera position, subject distance, and background geometry remain the controlling factors.
Similar working distance
Both official specifications and the PRO manual list a 0.5m minimum focusing distance. That is close enough for head-and-shoulders portraits and details, but neither lens is a dedicated macro optic. A US product page has displayed a conflicting 0.2m figure; because the measurement convention is not resolved here, 0.5m is the defensible figure to use when planning a shot.
Micro Four Thirds compatibility
These are native Micro Four Thirds lenses. The 90mm-equivalent description already accounts for the format’s angle of view; it does not mean either lens physically changes focal length. Check that your camera body accepts Micro Four Thirds lenses and that its firmware and autofocus modes support the functions you intend to use.
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Why f/1.2 matters compared with f/1.8
One stop for exposure
f/1.2 is one stop faster than f/1.8. At the same shutter speed, the PRO can admit about twice as much light as the f/1.8. In practical terms, a photographer can use a shutter speed twice as fast, lower ISO by one stop, or divide the benefit between the two. That can be useful when a subject is moving, when indoor light is weak, or when you want to keep ISO under control.
The advantage is not automatic. If you already shoot at a comfortable shutter speed and your camera is at a clean ISO, the extra light may have little visible value. Conversely, if you mostly stop both lenses down to f/2.8 or smaller, the PRO’s maximum-aperture advantage is not being used.
Depth of field and subject separation
At the same distance and framing, opening to f/1.2 produces a shallower depth of field than f/1.8. The difference is most visible in a close portrait: the focused eye can remain sharp while the background melts more strongly. The wider aperture also gives you more control over how much of a face remains within the zone of sharpness, so careful focus placement becomes more important.
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Mirrorless Comparison’s side-by-side testing reported stronger subject separation and smoother transitions from the PRO at f/1.2. The reviewer said bokeh differences were not significant when both lenses were used at f/1.8. Treat those observations as one reviewer’s results on an Olympus E-M1, not as a universal laboratory ranking.
Size, weight, and the cost of carrying the lens
| Specification | 45mm f/1.8 | 45mm f/1.2 PRO |
|---|---|---|
| Focal length / 35mm equivalent | 45mm / 90mm | 45mm / 90mm |
| Maximum aperture | f/1.8 | f/1.2 |
| Weight | 116g | 410g, excluding hood and cap |
| Dimensions | 56 × 46mm | 70 × 84.9mm |
| Filter thread | 37mm | 62mm |
| Minimum focus distance | 0.5m | 0.5m |
| Maximum magnification | 0.11× actual, 0.22× in 35mm-equivalent terms | Not stated in the supplied specifications |
The PRO weighs roughly 3.5 times as much as the bare f/1.8 lens. That difference affects more than a scale reading. A small camera with the f/1.8 can remain comfortable on a neck strap, fit in a compact pouch, and leave room for another lens. The PRO creates a more front-heavy setup on a small body and occupies substantially more space in a shoulder bag.
Neither lens’s current transaction price was established here, so a current dollar figure or fixed price ratio would be misleading. Compare live prices in your region before buying, and include the cost of any 37mm or 62mm filters you actually need. The practical value question is clearer than the unverified price question: you are paying for a wider aperture, controls, and protection, not a different focal length.
Weather protection and physical handling
PRO construction
OM SYSTEM describes the 45mm f/1.2 PRO as splashproof and dustproof. That is useful when working in light rain, dusty locations, or changing outdoor conditions with a compatible protected camera body. It is not a claim that the lens is waterproof or safe to submerge. Weather protection only works as a system when the camera, lens mount, and other openings are also appropriately protected.
f/1.8 simplicity
An independent comparison lists the 45mm f/1.8 as having no weather sealing. Treat it as a fair-weather or controlled-environment lens unless your camera maker gives more specific guidance for your exact combination. A compact lens can still be the better choice when the assignment lets you avoid bad weather altogether.
Controls that change the shooting experience
The PRO includes a focus clutch, a programmable lens button, and a hood in the box according to OM SYSTEM’s product information. The focus clutch lets you switch between autofocus and a manual-focus operation by moving the focus ring, while the programmable button can be assigned through a compatible camera body. Those controls are valuable when you repeatedly switch modes during a session.
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The f/1.8 is intentionally simpler: its portability and basic focus ring are the main handling benefits. Fewer controls mean less to configure and less hardware to carry, but also fewer ways to change focus behavior without reaching for the camera body.
Sharpness, rendering, and flare: what the comparison actually found
Wide-open performance
In Mirrorless Comparison’s side-by-side test on an Olympus E-M1, the PRO was sharper at the widest aperture settings. The same review found the two lenses nearly indistinguishable for sharpness at f/2.8 and smaller. This makes the distinction most relevant to photographers who deliberately work near maximum aperture, rather than to someone who routinely uses f/4 or f/5.6.
A reviewer’s result should not be treated as a guarantee for every camera, subject, focusing distance, or copy of a lens. Sensor resolution, focus accuracy, processing, and the subject’s texture all influence perceived sharpness. Use the finding as a decision aid: the PRO has more evidence in its favor when wide-open detail is central to your work, while the cheaper lens can deliver comparable stopped-down results in that test.
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The PRO’s f/1.2 setting gives it a physical aperture advantage, and the review reported smoother transitions and stronger separation there. If both lenses are set to f/1.8, the reported bokeh difference was not significant. Therefore, buying the PRO solely for a different look at f/1.8 is hard to justify; buying it to use f/1.2 regularly is a more coherent reason.
Flare and backlighting
The reviewer observed flare or ghosting from both lenses when pointed toward the sun despite their coatings. A hood can help with stray light from outside the frame, but it cannot eliminate every artifact from a bright source in or near the composition. If you shoot backlit portraits, keep the sun’s position, the hood, and a slight change in camera angle in your plan.
Autofocus behavior and camera-body dependence
On the Olympus OM-D E-M1 used in the comparison, both lenses focused quickly and quietly in single autofocus and continuous autofocus. Performance deteriorated in low-contrast or poor light, which the reviewer attributed mainly to the camera’s autofocus system. This is a body-specific observation, not a promise that every Micro Four Thirds camera will behave identically.
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For people photography, test the lens on your own body if possible. Confirm that face and eye detection can acquire the subject at your intended aperture, that continuous autofocus tracks movement acceptably, and that the focus-clutch behavior matches your manual-focus habits. A faster aperture cannot compensate for a camera that struggles to identify a low-contrast subject.
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Which lens fits your shooting pattern?
Choose the 45mm f/1.8 when portability is the priority
- You walk, travel, or attend events where a 116g lens is easier to keep with you.
- You mostly photograph in daylight or other adequately lit spaces.
- You normally stop down and would rarely use f/1.2.
- You want a small 90mm-equivalent prime for occasional portraits rather than a primary professional tool.
- Your camera body is small and you prefer a balanced, unobtrusive setup.
- Your lens budget is limited and current prices make the PRO’s premium difficult to justify.
The f/1.8’s 0.11× actual maximum magnification is also useful for details that are larger than a macro subject, such as a face, hands, or a small object, while retaining a compact kit.
Choose the 45mm f/1.2 PRO when the aperture earns its weight
- You regularly photograph portraits at or near maximum aperture.
- You work in available light and need the extra stop for shutter speed or ISO.
- You want the strongest separation the pair can provide at the same working distance.
- You shoot outdoors in conditions where splashproof and dustproof construction is relevant.
- You will use the focus clutch and programmable button often enough to improve your workflow.
- You earn money from portrait sessions or otherwise value wide-open rendering more than minimum carry weight.
The PRO is a poor fit if it will spend most of its life stopped down in a bag. Its extra mass and volume are easiest to justify when its defining features are active during real assignments.
A practical buying and setup checklist
- Identify your usual aperture. Review recent portraits and note whether you commonly shoot at f/1.8, f/2, or wider. If you rarely work near that range, the PRO’s central advantage is reduced.
- Set a minimum shutter speed for people. Decide whether the extra stop would let you use a faster shutter for hand movement, expressions, or children. If your existing shutter speed is already sufficient, prioritize portability.
- Check your carrying system. Mount each lens on your camera, if possible, and assess front weight, strap comfort, and whether the combination fits your bag.
- Plan for the weather you actually face. The PRO’s splashproof and dustproof description is relevant only when paired with a compatible protected body. Do not treat it as waterproofing.
- Confirm filter and hood needs. The f/1.8 takes 37mm filters; the PRO takes 62mm filters and includes a hood. Buy a filter only for a specific use, such as controlling reflections or protecting the front element in a defined environment.
- Test autofocus on your body. Check face and eye detection, continuous tracking, and low-light acquisition with the subjects you photograph. The published AF comparison was made on one E-M1 body.
- Practice focus at f/1.2. Use a single eye target or an appropriate eye-detection mode and inspect results at high magnification. The thinner depth of field makes small focus errors more visible.
- Test backlighting. Photograph a bright source near the frame edge and in the frame so you know how flare affects your preferred composition.
Common buying mistakes
Choosing by focal length alone
Because both lenses are 45mm and 90mm-equivalent, the focal-length label cannot decide this comparison. The meaningful differences are aperture, size, protection, controls, and wide-open rendering.
Assuming the PRO is always sharper
The cited comparison favored the PRO at the widest settings but found nearly indistinguishable sharpness at f/2.8 and smaller. If your technique and lighting lead you to stop down, the smaller lens may deliver the practical result you want.
Confusing weather resistance with waterproofing
Splashproof and dustproof construction can improve resilience, but it does not authorize submersion or careless exposure. Keep the body and all connected parts within their stated limits.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Ignoring the hidden cost of size
A heavier lens can make you leave the camera at home, change your support requirements, or carry fewer lenses. A theoretically better portrait lens is not better for a session in which it is uncomfortable enough to avoid using.
Using maximum aperture for every portrait
f/1.2 creates a narrow focus zone. For groups, moving subjects, or portraits where both eyes must be sharp, stopping down can produce more reliable results. The PRO’s value is the option to open up when the scene and your creative intent call for it, not an obligation to do so.
Decision guide by scenario
| Scenario | More practical choice | Reason |
|---|---|---|
| Travel portraits with a small camera | 45mm f/1.8 | 116g body-friendly package and minimal bag space |
| Indoor portrait session with limited light | 45mm f/1.2 PRO | One-stop advantage for shutter speed or ISO |
| Mostly daylight and frequent stopping down | 45mm f/1.8 | The cited comparison found similar sharpness at f/2.8 and smaller |
| Outdoor work in changing weather | 45mm f/1.2 PRO | OM SYSTEM describes splashproof and dustproof construction |
| Professional portrait workflow using manual focus often | 45mm f/1.2 PRO | Focus clutch and programmable button add control |
| Occasional portraits on a limited budget | 45mm f/1.8 | Lower carrying burden and no need to pay for unused features |
Final recommendation
The 45mm f/1.8 is the sensible default for most Micro Four Thirds owners who want a compact portrait prime. It gives the same 90mm-equivalent framing, focuses as close as the PRO according to the stated specifications, and is light enough to carry routinely. It is especially compelling when your portraits are made in good light or at stopped-down apertures.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The 45mm f/1.2 PRO is the purposeful upgrade for photographers who will repeatedly exploit f/1.2, need an extra stop in available light, want maximum separation at wide aperture, or work where splashproof and dustproof construction and faster on-lens control matter. Its 410g weight, larger 70 × 84.9mm body, and 62mm filters are real trade-offs, not footnotes.
Choose based on the shots you actually make: buy the small lens when carrying it everywhere will produce more photographs, and buy the PRO when its aperture and handling features solve a recurring problem.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
