Laowa 25mm f/2.8 2.5-5X 5:1 Ultra-Macro - Pentax K

The Laowa 25mm f/2.8 2.5-5X Ultra Macro for Pentax K-mount is a specialized high-magnification tool designed specifically for "extreme" macro photography. Unlike standard macro lenses that stop at 1:1 (life-size), this lens starts at 2.5x and can reach a staggering 5x magnification. It is a dedicated laboratory and field instrument that does not offer infinity focus; instead, it is engineered entirely to reveal microscopic details—from the individual scales on a butterfly wing to the intricate facets of a snowflake—that are invisible to the naked eye.

A key advantage for Pentaxians is the lens's wide-angle 25mm focal length. In the world of extreme macro, depth of field becomes paper-thin; by using a wider focal length, this lens provides a noticeably deeper plane of focus compared to 100mm or 180mm macro lenses at the same magnification. Housed in a remarkably slim, tapered barrel, it is designed to provide maximum "working room," allowing you to place flashes or LED lights close to your subject without the lens barrel casting a shadow.

Product Features in Detail

Beyond Life-Size Detail
Most macro lenses require expensive bellows or extension tubes to reach even 2x magnification. This lens provides a seamless 2.5x to 5x range built directly into the barrel, allowing you to fill your entire Pentax sensor with a subject smaller than a grain of rice.

The "Lighting-Friendly" Design
At extreme magnifications, the lens is often so close to the subject that it blocks all available light. Laowa solved this with a uniquely narrow front barrel. This "slim-nose" design provides enough clearance for you to angle twin-flashes or fiber-optic lights directly onto your subject.

Superior Chromatic Control
When you magnify a subject by 500%, optical flaws like color fringing become very obvious. The integrated ED element ensures that high-contrast edges—like the legs of an insect or the edges of a crystal—remain sharp and free of distracting purple or green halos.

Tactile Manual Precision
Because depth of field is so critical at these levels, the lens is fully manual. The magnification and focus rings are deeply knurled and weighted, providing the ultra-fine control needed when a 0.1mm turn of the ring can be the difference between a blurry shot and a masterpiece.

Compact Portability
Despite its massive magnification power, the lens is small enough to fit in a jacket pocket. This makes it an incredible tool for field biologists and nature photographers who want to capture microscopic details on the trail without carrying a full laboratory setup.

Smooth Bokeh for Tiny Worlds
The 8-blade diaphragm creates a pleasing, rounded out-of-focus quality. This is particularly important at 2.5x magnification, where you may still have some background visible; the lens ensures those elements melt away into a smooth, non-distracting wash.