OM SYSTEM 40-150mm f/4 M.Zuiko Digital ED PRO Lens for MFT (Micro Four Thirds), Black {62}

OM System's 40-150mm f/4 PRO: 300mm reach under a pound

At 382g and 99mm long, this is the lightest fixed-aperture telephoto zoom reaching a 300mm equivalent in the Micro Four Thirds system. That weight matters when you're carrying a full kit across a trail or working a multi-day event. The constant f/4 aperture stays consistent through the entire zoom range, and the 15-element, 9-group optical formula draws on HR, Super ED, ED, and aspherical glass to control chromatic and spherical aberrations across the frame. ZERO coating handles ghosting and flare suppression, and a fluorine front element coating keeps field cleanups fast.

The IP53 weather seal rating covers both splash and dust resistance, and the lens operates down to 14°F / -10°C, so cold-weather fieldwork doesn't require rethinking your kit. Inner zoom construction keeps the barrel length fixed at 99mm regardless of focal length, which matters for balance on smaller MFT bodies. Minimum focus distance sits at 70cm across the full zoom range, giving a 0.41x magnification equivalent that opens up close-focus work on flowers, insects, and other small subjects. Cameras with Focus Stacking support can use this lens to build extended depth-of-field composites in the field. For a PRO-grade telephoto zoom that fits in a jacket pocket, the value proposition here is hard to argue with.

Who It's For

Hikers and nature photographers who log serious mileage will notice that 382g versus a full-frame 100-400mm immediately. Bird and wildlife shooters get 300mm equivalent reach with a constant f/4 and edge-to-edge sharpness that holds up to high-resolution bodies running 50MP High Res Shot mode. Travel photographers benefit from the inner zoom barrel, which stays pocketed without extending, and the IP53 rating covers tropical downpours and dusty markets alike. Macro-inclined shooters working in the field gain a 70cm minimum focus distance across the entire zoom range, making this a two-role lens on any single outing.

Key Features

• 40-150mm focal length with 80-300mm equivalent reach on Micro Four Thirds
• Constant f/4 aperture throughout entire zoom range
• 382g weight, 99mm length with inner zoom construction
• 15-element, 9-group optical design with HR, Super ED, ED, aspherical glass
• IP53 weather sealing, operates to 14°F / -10°C
• 70cm minimum focus distance, 0.41x macro magnification equivalent
• ZERO and fluorine coatings eliminate ghosting, flare, and water streaking

FAQ

What makes this lens so light compared to other 300mm equivalent telephoto zooms?

The 40-150mm weighs 382g with an inner zoom design that keeps the barrel at 99mm regardless of focal length. That combination of fixed f/4 aperture, compact optics, and retractable construction gives you 300mm equivalent reach without the weight penalty of traditional telephoto designs.

Does the f/4 aperture stay constant across the entire 40-150mm range?

Yes. The constant f/4 maximum aperture holds from 40mm through 150mm, so you maintain consistent light transmission and depth-of-field control whether you're at the wide or tele end of the zoom.

Can I use this lens for close-focus work like macro photography?

The 70cm minimum focus distance across the entire zoom range gives you 0.41x magnification equivalent, opening up macro work on small subjects. If your camera supports Focus Stacking, you can build extended depth-of-field composites with this lens.

What's the weather sealing rating and how cold can I shoot?

IP53 rating covers splash and dust resistance. The lens operates down to 14°F / -10°C, so cold-weather shooting is fully supported without rethinking your kit.

How does the fluorine coating help in the field?

The fluorine front element coating sheds water and moisture quickly with one wipe, eliminating streaks and water droplets so you get back to shooting faster instead of dealing with prolonged cleanups.

What glass types are in the optical formula?

The 15-element, 9-group design uses HR, Super ED, ED, and aspherical elements to control chromatic and spherical aberrations. ZERO coating handles ghosting and flare suppression across the frame.

Will this lens work on all Micro Four Thirds mirrorless cameras?

Yes, it's compatible with any camera using the Micro Four Thirds mount, including OM System, Panasonic, and Blackmagic models.