OM System E-M10 IV + Olympus OM 50mm f/1.4: Full Circle
There is something pointed about mounting a 1970s Olympus OM-System 50mm f/1.4 lens onto an OM System digital body four decades after the original system was discontinued. The Olympus OM mount, discontinued in the 1980s when Olympus moved to autofocus, left behind a generation of lenses that are available cheaply on the secondary market and adapt to Micro Four Thirds via a $20 OM-to-MFT adapter without optical compromise. On the E-M10 IV, the company’s most accessible current body, the old glass completes a circle that the company’s rebranding as OM System seems designed to acknowledge.
The OM 50mm f/1.4 on Micro Four Thirds delivers a 100mm equivalent — a proper short telephoto portrait length. At f/1.4, the depth of field on MFT is equivalent to approximately f/2.8 on full frame, which provides genuine subject isolation without the extreme depth-of-field sensitivity that creates focus anxiety at shorter working distances. The rendering is warm and smooth by contemporary standards: Olympus OM glass from this era was designed by engineers who treated optical character as a feature rather than a tolerance failure, and the 50mm f/1.4 specifically was a flagship lens that received corresponding attention.
The E-M10 IV’s five-axis in-body image stabilization is exceptional for its price point. Applied to a manual focus 100mm equivalent lens — an application where stabilization is particularly valuable, since the photographer is managing focus independently of camera motion compensation — the IBIS allows handheld shooting at shutter speeds that the physics of 100mm equivalent would otherwise prohibit. Portrait-distance shots at 1/30s are achievable with acceptable success rates. This changes the practical capability of the combination substantially.
Focus peaking in the E-M10 IV’s EVF is reliable, and the MagnifyAssist function provides the confirmation precision needed for accurate f/1.4 work. The E-M10 IV is among the more pleasant cameras to operate for manual focus work in this price tier: the EVF resolution is adequate, the magnification assist activates smoothly, and the peaking color can be selected to contrast with the scene being photographed.
The used E-M10 IV body trades in the $400 range. The OM 50mm f/1.4, depending on condition, is $50–$100. The adapter is $20. Under $550 for a complete portrait kit with 100mm equivalent reach, genuine subject isolation at f/1.4, and five-axis IBIS. For photographers who understand what they are trading — autofocus, primarily — the value proposition is difficult to find a better counter-argument against.