SG-Image’s AF 25mm f/1.8 lens goes on sale for Micro Four Thirds

SG-Image’s AF 25mm f/1.8 for Micro Four Thirds moved from rumor to something buyers could actually order on July 3, with listings now live through SG-Image’s own store and major marketplaces including Amazon, eBay, AliExpress, and Amazon Japan. For MFT shooters, that makes this a practical arrival rather than a spec-sheet tease: it drops into the system’s classic normal-lens slot, the kind of focal length people reach for when they want one compact prime that can handle street, documentary, casual portraits, and everyday shooting.

The lens is aimed squarely at that use case. Earlier published specifications put it at a 7-element, 5-group design with three high-refractive-index elements, a 9-blade aperture, a minimum focusing distance of 0.3 meters, a 52mm filter thread, and an estimated weight of about 145 grams. One report described it as about 31mm long, which would put it among the slimmest 25mm f/1.8 lenses in its class if that figure holds up in retail hands. SG-Image’s own product page says the lens uses an STM stepping motor, reinforcing the pitch that this is meant to be a small autofocus everyday lens, not a premium showcase optic.

That positioning matters because Micro Four Thirds has long leaned on compact primes to keep the system appealing. A 25mm lens on MFT gives a normal field of view, so the lens lands in the same practical category as the affordable walkaround options that have kept the format attractive for travelers, street shooters, and anyone who wants to carry less glass without giving up autofocus. SG-Image is not trying to redefine the focal length; it is trying to add another budget-minded entry in a segment where size, weight, and price often matter as much as image quality on paper.

The company’s wider lens lineup suggests this is part of a broader push, not a one-off experiment. SG-Image already sells autofocus and manual lenses across multiple mounts, including full-frame and APS-C products, and it had already used the 25mm f/1.8 design in other formats before bringing the Micro Four Thirds version to market. That makes the new model look less like a dead-end variant and more like SG-Image widening distribution across mount ecosystems that still reward small, affordable primes.

For Micro Four Thirds buyers, that is the real call here. The AF 25mm f/1.8 does not compete by being the biggest headline in the room. It competes by being small, familiar, and easy to justify, which is exactly the kind of lens that can end up on a camera far more often than the flashier options sitting beside it.