TL;DR — Olympus / OM System 25mm f/1.8
The Olympus 25mm f/1.8 remains one of the best value lenses in the Micro Four Thirds system. It’s compact, lightweight, focuses extremely quickly, and delivers excellent image quality wide open.
Sharpness is excellent across the frame, distortion and chromatic aberration are well controlled, and the lens focuses close enough to produce pleasing subject separation despite the smaller sensor.
The original version lacks weather sealing, but the new Mark II adds sealing while keeping the same optics, making it a better match for OM-1 and OM-3 users who shoot in less predictable conditions.
If you want a fast, dependable everyday prime without the size, weight, or cost of the 25mm f/1.2 PRO, this lens still offers one of the strongest price-to-performance ratios in the system.
Who Is the Olympus / OM System 25mm f/1.8 For?
This lens is for photographers who want a fast, dependable everyday prime without adding bulk or weight to their kit. It’s one of those lenses that quietly disappears in use — and that’s exactly why it’s so easy to recommend.
It’s ideal for street, travel, family photography, and general walk-around use, especially on bodies like the OM-1 and OM-3 where balance and responsiveness matter. Autofocus is fast and reliable, making it well suited to candid shooting and everyday moments.
If you value portability, speed, and value over maximum subject separation or premium build, this lens makes a lot of sense. The new Mark II version is particularly appealing if you shoot outdoors and want weather sealing without stepping up to the size and cost of the PRO lenses.
It’s not for photographers chasing ultra-shallow depth of field or those who already own the 25mm f/1.2 PRO and are happy carrying the extra size and weight. But for most Micro Four Thirds users, this remains one of the most sensible and satisfying lenses in the system.
Last Updated January 2026:
📷 Update: OM System 25mm f/1.8 Mark II now available
OM System has recently released the updated 25mm f/1.8 Mark II, and it finally adds weather sealing — one of the biggest omissions from the original version reviewed here. I have also recently reviewed the 17mm 1.8 mark II lens. Optically, it appears to be identical, but the added sealing and refreshed exterior design make it a more future-proof choice for OM-1 or OM-3 users who shoot in unpredictable conditions. I’m using it regularly on my OM Systems OM-3 and used it in my comparison of the OM-3 and Fuji X100VI. In fact this lens and the other 1.8 primes are part of why I love using my OM-3.
I’ll be testing the new version soon along with the O-M3 and will update this article with a full comparison. In the meantime, if you’re torn between the original, the new Mark II, or the f/1.2 PRO, check out my OM-1 review to see which lenses I use most often in the real world.
The Olympus 25mm f/1.8 is a premium fast aperture prime lens from Olympus. It is available in either silver or black. I have the black version and have been using it on my OMD EM1 ii.
🔍 Quick Comparison: Popular 25mm Lenses for Micro Four Thirds
| Lens | Max Aperture | Weight | Weather Sealed | Price (Approx.) |
|---|---|---|---|---|
| Olympus 25mm f/1.8 | f/1.8 | 137g | No (Mark II: Yes) | £250–£300 |
| Panasonic 25mm f/1.4 II | f/1.4 | 205g | Yes | £350–£400 |
| OM System 25mm f/1.2 PRO | f/1.2 | 410g | Yes | £1,000+ |
Olympus 25mm 1.8 Review – Construction and Handling
The Olympus 25mm f1.8 is constructed using high quality plastics. It feels nicely built and not cheap like Canon’s nifty 50 lens. The lens makes for a very light and compact combination even on Olympus’ larger bodes such as the OMD EM1 ii.
I have been out this morning for a Sunday stroll with this combination and it feels so light and compact that I hardly even noticed that I was carrying the camera.
Thankfully Olympus supply this lens with a lens hood although I haven’t used it much but it is certainly right and nice that Olympus saw fit to include a lens hood with this lens.
In terms of construction it feels more solid and better made than the cheaper kit zooms but it is not up to the standards of the Olympus 75mm 1.8 or the pro grade lenses but then this lens is not in the same price category coming in at under £300 on Amazon UK.
Autofocus performance of this lens is nothing short of excellent. It is incredibly quick to focus and silent too. It focuses instantaneously and is very accurate. Whether the scene is front lit, back-lit or when using it in low light the auto focus performance is a s good as any lens in the system. It is noticeably quicker to focus than the Panasonic 25mm 1.4 for instance and as quick as the Olympus 25mm 1.2 Pro. Both of which are more expensive.
Is the Olympus / OM System 25mm f/1.8 Still Worth Buying in 2026?
The short answer is: yes — but context matters. Optically, the original Olympus 25mm f/1.8 and the new OM System 25mm f/1.8 Mark II share essentially the same lens formula. That means the look, sharpness, and overall image quality you care about are unchanged, even years on.
If you’re considering this lens on the second-hand market, it remains one of the best value buys in the Micro Four Thirds system. You still get excellent optics, very fast autofocus, and a light, compact profile that works beautifully on modern bodies like the OM-1 and OM-3.
If you’re buying new in 2026, however, the Mark II version makes more sense. The addition of weather sealing addresses one of the original lens’s biggest weaknesses, and current pricing is close enough that there’s little reason not to choose the updated version.
In short: buy used and save money with the original if condition is good. Buy new and take the Mark II for the added durability and peace of mind.
Olympus 25mm 1.8 Review – Image Quality
The Olympus 25mm 1.8 doesn’t suffer from any noticeable distortion. It is also highly resistant to lens flare, even when pointing it directly at the Sun as I did this morning.
It doesn’t suffer with CA in high contrast situations and in fact having tested it over and over again I am very impressed with the performance of this lens in every aspect.
The lens also focuses incredibly closely at 25cm. Combine this with the f/1.8 aperture and you ave the ability to really throw the background out of focus to create some nice bokeh effects.
The lens is sharp wide open and doesn’t really show much improvement when stopped down further. Again the performance of this lens is excellent.
Olympus 25mm 1.8 Review – Conclusion
Unfortunately, my version of the Panasonic 25mm f/1.4 broke — it simply stopped working one day and never powered on again. It seems the internal electronics or contacts failed after just a few months of use. This was actually my second copy of the lens, and I didn’t have this issue with the first, but it’s still a little concerning and has put me off the lens, which is a real shame. The rendering is beautiful, and in terms of size, it strikes a lovely balance — sitting right between the OM System 25mm f/1.8 and the 25mm f/1.2 PRO.
There are now a lot of choices in the Micro 4/3 system for this focal length. I currently have 3 25mm lenses, the Pana-Leica 25mm 1.4, Olympus 25mm 1.2 Pro and this lens. So which one should you choose?
The performance of all 3 lenses is stellar, however the price points vary so is it worth paying more for the other the lenses.
In terms of optical performance they are all excellent. Only the Panasonic lens suffering slightly with CA. All are sharp wide open. The Olympus 25mm 1.8 is the cheapest option and if you have an Olympus camera I would recommend it if you don’t need weather-sealing and the 1.8 aperture is sufficient for your needs. It is also the lightest of the 3 lenses and makes a great walk around package even with my OMD EM1 ii. It is also small enough to carry in a pocket and light enough to sling in your camera bag as a just in case you need it lens.
Of the 3 lenses I would say it offers the best price/performance ratio and is the one I would recommend to most people. It really is a fantastic little lens and its performance is so close to the 25mm 1.2 optically that unless you really need f/1.2 or weather-sealing then it is hard to justify the additional cost of the Pro lens.
On an Olympus camera I also prefer the handling and auto focus performance to the Pana Leica 1.4.
📌 Frequently Asked Questions
Which 25mm lens is best for Micro Four Thirds?
It depends on what you prioritise. Personally, I enjoy using the OM System 25mm f/1.2 PRO the most — the build quality, handling, and image quality are exceptional. That said, it’s a large and relatively heavy lens, although it balances nicely on the OM-1 Mark II which I currently use it with.
If you prefer something more compact, the Panasonic 25mm f/1.4 II offers a fantastic compromise between image quality and size. However, I recommend reading the article to see the major issue I had with my copy of that lens.
Is the Olympus 25mm f/1.8 weather-sealed?
No, it isn’t. However, OM System has just released a Mark II version of the lens which is weather-sealed. I’ll be testing it soon and will update the article once I’ve had a chance to use it.
Is the Olympus 25mm f/1.8 fast focusing?
Yes — autofocus is very quick and almost completely silent. It performs well for both stills and video use.
Is the Olympus 25mm f/1.8 good in low light?
Yes, it offers solid low-light performance thanks to its f/1.8 aperture. It’s significantly faster than kit zooms or standard zoom lenses — only the much larger and more expensive Panasonic 10–25mm f/1.7 beats it in that regard.