Olympus mju / Infinity Stylus
Olympus · Fixed lens · 24×36mm on 35mm film, hinged back · 1991
Also known as: Olympus mju · Olympus mju-1 · Olympus mju I · Olympus Stylus · Olympus Infinity Stylus · オリンパス μ[mju:] · オリンパス ミュー
Variants & identification
| Variant | Mount | Years | Serial ranges | Production |
|---|---|---|---|---|
| μ[mju:] / ∞ Stylus (March 1991) | 35mm compact | 1991 | — | Over 5,000,000 as a single model — Olympus's own product history, which uses the word for units produced rather than units sold |
| μ[mju:] LIMITED (April 1991) | 35mm compact | 1991–1991 | — | 50,000 worldwide — a limited production stated by Olympus, at ¥50,000 |
| μ[mju:] QUARTZ DATE / ∞ Stylus Deluxe | 35mm compact | — | — | No separate figure published |
| μ[mju:] PANORAMA (July 1992) | 35mm compact | 1992 | — | No figure published |
- There is a manufacturer's design account for this camera and the English literature does not use it. Olympus published a development-team interview in its own house magazine, VisionAge No. 15 (1991), headed "The μ[mju:]-1 Story: 'We broke all the rules...'" and conducted at the Utsugi Technology Research Institute. It names six people — Tatsuya Suzuki as development team supervisor, Yoshinori Katsuyama as industrial design leader, Akinori Mitsuse on industrial design, Kazunori Mizogami leading electronics, Shunji Matsutani on mechanical engineering and Akira Watanabe on electronics. Maitani is not among them. Katsuyama's own framing is lineage rather than authorship: the μ's "design follows a trend that can be traced back to the Olympus XA". The team also states that the first prototype came out too thick and that shrinking it forced a redesign of virtually every component, taking two years.
- The same interview is the closest thing to a primary source on the lens, and it does not give a formula. What it gives is a parentage: "The lens is similar in design to the one used in the AF-10 Super", with the μ's contribution being a new mounting process and a new silicone adhesive to seat the elements precisely. That is Olympus saying where the optic came from without saying what is inside it, which is a different and better-founded statement than the element counts that circulate.
- The lens construction cannot be settled from a manufacturer document, and it is worth being exact about why. Olympus's online press-release archive begins in 1996, so no 1991 specification sheet is available; the company's product-history page for the camera gives the price, the autofocus and the production figure but not the optical formula. Every secondary source consulted — 135compact.com, camera-wiki, Jim Grey, Analog.Cafe — gives three elements in three groups, a triplet, and none of them says where it got the number. The competing figure a reader will meet is four elements in four groups, and that one is documented: it is the mju-II's, stated as 4群4枚 with an aspherical element in Olympus's press release of February 1998. The two cameras are six years and one lens apart, and the figures should not be swapped between them.
- Olympus's own series figures come in three shapes and count three different things. The February 1998 press release for the μ-II LIMITED states that the μ series was introduced in 1991 and reached 10 million cumulative sales in February 1998. The company's product-history page for the series says cumulative production passed 25 million, with no date and with the digital cameras included. The product page for this camera says over five million produced as a single model. None of these contradicts another, but they are sales, production and single-model production respectively, and they are routinely quoted as if interchangeable.
- Assembly moved. 135compact.com records that the camera was first built in Japan and later assembled in China from Japanese parts, and Dmitri at Analog.Cafe reports the same split from handling a dozen or so of them, with the earlier, lower serial numbers Japanese-built. He reports no difference in quality or reliability between the two, and no price difference in the used market. No serial range has been published that would let a buyer date the change, and this project has not seen one.
- The μ LIMITED's 50,000 is stated by Olympus as a limited production quantity, not an estimate, and it sits oddly beside the μ-II LIMITED seven years later, whose 65,000 was split 5,000 domestic and 60,000 export. Olympus published that split; it published no such breakdown for the 1991 edition.
- The camera has no documented end date. Olympus's product history gives launch months and never discontinuations; the μ-II arrived in March 1997 and is usually treated as the moment the original stopped, but no source consulted here states when the last one was built. `years.last` is therefore unset.
How to tell them apart
- The clamshell. A curved barrier slides back over the lens and the flash in one movement, and opening it powers the camera on — no cap, no separate switch
- A thumb bump on the back right that shapes the grip; the whole body is 170 g without a battery
- The lens moves out about 3 mm when the cover opens, and no further — there is no zoom and no telescoping barrel
- One CR123A, a mid-roll rewind pin under the lens, and a film window in the door
- Flash defaults to auto at every power-on, and reaching flash-off takes two presses
μ[mju:] / ∞ Stylus (March 1991):
- Plain black shell; the sliding barrier covers the lens and the flash together
- One large round release, an LCD, and two buttons for flash mode and self-timer
μ[mju:] LIMITED (April 1991):
- Polished metallic silver-black finish in place of the plain black
μ[mju:] QUARTZ DATE / ∞ Stylus Deluxe:
- Two extra buttons on the top plate for setting the date, and imprinting on every frame
- The American Deluxe adds gold-coloured trim the plain camera does not have
μ[mju:] PANORAMA (July 1992):
- An external switch that masks the frame to panorama format part-way through a roll
- μ[mju:] / ∞ Stylus (March 1991): The camera itself, sold as μ[mju:] everywhere except the United States, where it is the ∞ Stylus. The retrospective name mju I was applied only once later models made the series need one.
- μ[mju:] LIMITED (April 1991): Announced a month after the camera it is based on, which is unusual for a commemorative edition and suggests it was planned alongside rather than in response to sales. The 50,000 is one of only two hard quantities anywhere in this family, and it comes from Olympus.
- μ[mju:] QUARTZ DATE / ∞ Stylus Deluxe: A date back rather than a different camera. Olympus's own product history does not list it separately, which is why it has no dates here; the naming differs by market in the same way the base camera's does.
- μ[mju:] PANORAMA (July 1992): Olympus describes the mechanism as its own achievement rather than a masking gimmick: small strong magnets let the switch work mid-roll without changing the body's size or shape. Same ¥37,000 price as the standard camera.
Specifications
- Format
- 24×36mm on 35mm film, hinged back
- Finder
- Direct-vision finder with a central autofocus target and faint close-range parallax brackets; a green lamp for focus confirmation, blinking when focus fails, and an orange lamp for low light · no rangefinder image
- Shutter
- programmed electronic shutter · 1/15 – 1/500 · self-timer
- Film advance
- motorised loading, advance and rewind, with mid-roll rewind
- Back
- hinged; date imprinting on the QUARTZ DATE / Deluxe versions only
- Meter
- Programmed automatic exposure. DX film speed setting ISO 50–3200. Four flash modes — auto, auto with red-eye reduction, off, and fill — with a guide number of about 12 in metres at ISO 100.
- Designed by
- Suzuki Tatsuya — development team supervisor, named as such by Olympus in the μ[mju:]-1 development-team interview it published in VisionAge No. 15 (1991) · Katsuyama Yoshinori — industrial design leader, per the same Olympus interview · Mitsuse Akinori — industrial design; in the same interview he is the one who describes drawing the body to please himself and to stop it looking like a picture-taking machine · Mizogami Kazunori — electronic design leader, per the same Olympus interview · Matsutani Shunji — mechanical engineering, per the same Olympus interview · Watanabe Akira — electronic engineering, per the same Olympus interview · Maitani Yoshihisa (米谷美久) — Credited with the design in most English accounts, and not a member of the development team Olympus itself named; by March 1991 he had been an Olympus director for seven years and head of the First Business Division for one — see the disputed block
- Weight
- 170 g
- Dimensions
- 117 × 63 × 37 (135compact.com) mm
- Country
- Japan; later batches assembled in China from Japanese parts
- Original price
- ¥37,000 at launch in March 1991, and ¥37,000 again for the PANORAMA of July 1992; the μ LIMITED of April 1991 was ¥50,000. All three prices are from Olympus's own product history. (today ¥43,000)
No magnification figure is published in any source consulted here. Reviewers describe the eye relief as usable with spectacles and the eyepiece as small.
Where sources disagree
- Design credit
- Maitani Yoshihisa designed it: 135compact.com calls the mju a new design by Maitani, chief camera designer at Olympus since the 1950s, inheriting the round shape and sliding cover from his XA
- Maitani influenced it: Casual Photophile says his influence can be seen in the later mju and Stylus ranges as futuristic derivatives of the XA, which credits lineage rather than authorship
- Suzuki Tatsuya led it: Olympus's own house magazine VisionAge No. 15 (1991) presents him as development team supervisor of the μ[mju:]-1 itself, alongside Katsuyama and Mitsuse on industrial design
Better supported: The Olympus development-team interview
One of these three is a manufacturer document about this camera and the other two are not. VisionAge No. 15 is Olympus's own magazine, published in 1991, interviewing the μ[mju:]-1 team at the Utsugi Technology Research Institute; it names Suzuki as development supervisor, Katsuyama as industrial design leader and Mitsuse as the industrial designer who describes drawing the body, and it does not mention Maitani at all. The Suzuki name had been circulating on weaker evidence — pen-and-tell's translation of a 1993 Mark Schreiber piece for Time, where he is Assistant General Manager for product development and is discussing the mju zoom — and the coincidence is worth flagging rather than resting on, but the 1991 interview does not depend on the 1993 one. Against it, Maitani's own biography in Japanese Wikipedia, sourced to Asahi Shimbun of 11 April 1992 and Yomiuri Shimbun of 3 October 2009, has him a director from 1984, head of the First Business Division from 1990, managing director from 1992: in March 1991 he was running a division from the board, not drawing a compact. What survives on all three accounts is the lineage, and Olympus's own designer states it — the μ's design "follows a trend that can be traced back to the Olympus XA". Inherited shape is not authorship.
- Autofocus resolution
- 100 steps (Olympus's product-history page for the camera; and the μ[mju:]-1 advertisement inside VisionAge No. 15, which calls it "a new, incredibly accurate, 100-step autofocus system")
- 200 steps (Olympus's own development team in the VisionAge No. 15 interview: an AF system that "measures the distance to the subject in 200 steps", adopted because a 35 cm minimum shooting distance needs more precision than long-range focusing)
Better supported: Unresolved — both are Olympus
This is not a manufacturer against an enthusiast; it is one Olympus publication against another, and in the 1991 case against itself, since the interview and the advertisement sit in the same issue. The two are reconcilable if the engineers are counting measurement steps and the marketing is counting focus positions the lens is driven to, which is a real distinction in an active-infrared system — but no Olympus text says so. The figure repeated everywhere since is the marketing one.
- Series totals: what each figure counts
- 10 million cumulative sales by February 1998 (Olympus press release, 12 February 1998, 累計販売台数1,000万台)
- Over 25 million cumulative production for the series (Olympus product history, series page, undated and including the digital cameras)
- Over 20 million copies sold, production ceasing in 2004 (Analog.Cafe)
Better supported: The 1998 press release, for anything about the film era
These are not rival counts of the same thing, and treating them as rivals is the mistake to avoid. One is dated sales of film cameras, one is undated production across film and digital, one is a secondary paraphrase. The dated manufacturer figure is the only one that supports an inference about the film models.
What reviewers say
- Dmitri (Analog.Cafe) (blog) — Sharp in the centre with a clear loss of detail in the corners, minimal flare, and more subject separation than an f/3.5 lens has any right to give. His practical warnings are about wear rather than design: the plastic shell scuffs more than its rivals do, the release loses sensitivity on used bodies, and stripped transport gears are a fatal fault worth testing for with a junk roll before buying.
- Jim Grey (Down the Road) (blog) — Long-term use rather than a test: a three-element triplet in a camera he reaches for more than almost anything else he owns, and one he expects to miss when it dies, because at current prices replacing it is not sensible and the electronics cannot be repaired.
- Josh Solomon (Casual Photophile) (blog) — "A good camera, but does it live up to the hype?" The f/3.5 is incredibly sharp stopped down and renders like a Cooke triplet wide open, in a body as long as an iPhone 5 — but the lens must extend fully for every shot, so there is lag, and the flash resets to on every time the door closes.
History
The mju went on sale in March 1991 at ¥37,000, and the thing it introduced was not a lens or a metering system but a shape. A curved shell with a barrier that slides back over the lens and the flash together, opening the camera as it opens, so there is no cap to lose, no switch to find and nothing sticking out to catch on a pocket. Olympus’s own product history describes an ergonomic body meant to sit in one hand, and records that the camera passed five million built as a single model. For a segment where the usual answer to how many is silence, that sentence is the most valuable thing on the page.
There are four things to tell apart. The plain camera, black, sold as μ[mju:] outside the United States and as the ∞ Stylus inside it. The μ LIMITED of April 1991, a polished metallic silver-black finish limited by Olympus to 50,000 worldwide and priced at ¥50,000 — a month after the camera it commemorates, which is early enough to suggest it was planned rather than earned. The QUARTZ DATE, which is the same camera with a date back, and which in America gains gold trim and the name Deluxe. And the PANORAMA of July 1992, whose switch masks the frame part-way through a roll using small magnets, a mechanism Olympus was proud enough of to describe on its own terms.
What the camera cannot tell a reader is what is inside the lens. Olympus’s online press archive starts in 1996, so the 1991 specification sheet is not there, and the company’s history page for the model gives the price and a hundred-step autofocus and the production figure and stops. Every secondary source says three elements in three groups — a triplet — and not one of them says where the number came from. The figure that circulates against it, four elements in four groups, belongs to the mju-II: Olympus stated it directly, with an aspherical element, in the release of February 1998. Two cameras, six years and one redesign apart, and the counts should not migrate between them.
The design credit is the question the English literature has been getting wrong, and it turns out to be answerable. Nearly every English source calls the mju a Maitani design, an evolution of his XA, and 135compact.com says so explicitly; Casual Photophile is more careful and credits influence rather than authorship. Meanwhile Maitani’s own biography, sourced to two Japanese newspapers, has him a company director from 1984 and head of the First Business Division from 1990 — in March 1991 he was running a division from the board. Olympus, though, published a development-team interview about this exact camera at the time, in its own magazine VisionAge, and nobody quotes it. The team is six people at the Utsugi Technology Research Institute: Tatsuya Suzuki supervising development, Yoshinori Katsuyama leading industrial design, Akinori Mitsuse drawing the body, Kazunori Mizogami on electronics, Shunji Matsutani on mechanics, Akira Watanabe on electronics. Maitani is not in the room. Mitsuse’s account of what he was doing is disarming — he designed it to please himself, because he is a consumer too, and because “boxy, mechanical-looking cameras are not for everyone” — and Katsuyama gives the XA its proper due as a trend the camera follows rather than a design it inherits. That is authorship on one side and lineage on the other, stated by the manufacturer, in 1991.
The same interview quietly complicates two numbers. Olympus’s product-history page and the advertisement in that very issue both say the autofocus works in 100 steps; the engineer being interviewed a few pages earlier says 200, and explains why — a 35 cm close-focus limit needs more precision than distance work does. And on the lens, where every secondary source asserts three elements in three groups without saying how it knows, Olympus says something narrower and more useful: the optic is similar in design to the one in the AF-10 Super, re-mounted with a new process and a new silicone adhesive to seat the elements precisely. A parentage instead of a formula. It is still not an element count, but it is the only thing about this lens that came from the company that built it.
Three smaller things stay unsettled. The camera has no published end date — the μ-II arrived in March 1997 and is treated as the successor, but nobody says when the last mju was built. Assembly moved from Japan to China at some point, reported by 135compact.com and independently observed by a reviewer who has handled dozens and found the change tracks the serial number, but no range has been published that would let a buyer date a body. And the series figures — 10 million cumulative sales by February 1998, over 25 million cumulative production across film and digital, 20 million in a secondary paraphrase — are three measurements of three different things that get quoted as if they were one.
This history is AI-written, from the sources listed at the foot of the page. Where the record is silent it says so rather than filling the gap — but no human wrote these sentences.
Example photos
Sample photo wanted — shot with a Olympus mju / Infinity Stylus? We'd love to feature it (with credit).
Live listings
Asking price, USD: a median of $260 across 20 fixed-price listings on 2026-09-11 (middle half $210–$300). Tracked since 2026-09-06, 2 days: unchanged from $260.
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Asking prices from the listings scanned, not sales; junk-flagged rows and auction lots excluded; other currencies are not converted.
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