Rokinon Cine DS 100mm T3.1 Review: Who It Fits and Who Should Skip It

What stands out

• 100mm focal length on Micro Four Thirds mount
• Minimum focusing distance of 1.0 ft for macro work
• T3.1 to T32 aperture range with 9 diaphragm blades
• Unified gears and dual focusing scales for cinema use
• 15 glass elements in 12 groups for image quality

Who it fits

Key specs explained for this lens

Focal Length: 100mm

This telephoto reach compresses background elements and isolates your subject. It is ideal for portraits or distant details where you cannot get close. On Micro Four Thirds bodies, the crop factor effectively extends this reach. You should consider this length if you need to shoot from a distance without disturbing your subject. Compare it to standard 50mm primes for a tighter field of view.

Maximum Aperture: T3.1

The T-stop indicates actual light transmission rather than just optical diameter. A T3.1 aperture allows for moderate low-light performance while maintaining sharpness. It is suitable for controlled lighting or bright daylight. You will need to manage depth of field carefully at this setting. Compare this to faster T1.5 or T1.8 lenses if you require significant background blur in dim environments.

Minimum Focusing Distance: 1.0 ft.

You can get very close to your subject, which is essential for macro photography. This short distance allows you to capture fine textures and small details with high magnification. It makes the lens versatile for both portraits and close-up work. You should plan your composition to stay within this range for best results. Compare this to standard lenses that often require several feet of distance.

Lens Mount: Micro Four Thirds

This lens is designed specifically for cameras using the Micro Four Thirds mount system. It ensures a secure physical connection and electronic communication if supported. You must verify your camera body uses this mount before purchasing. It is not compatible with Sony E, Canon EF, or Nikon F mounts without adapters. Compare this mount type to ensure it matches your existing camera gear.

Sensor Format: Full Frame

The lens optics are designed to cover a full-frame sensor area. This ensures even illumination and sharpness across the entire image circle. When used on smaller Micro Four Thirds sensors, the corners remain sharp without vignetting. This design choice provides high resolution and better edge performance. Compare this to lenses designed only for APS-C or smaller sensors.

Design and build overview

The Rokinon Cine DS 100mm T3.1 is finished in black. According to the listing, the lens measures 3.2 inches in width and height, with a length of 5.82 inches. It weighs 1.6 pounds. This compact form factor suits handheld use on Micro Four Thirds bodies. The size balances well with smaller mirrorless cameras, allowing for stable shooting without excessive bulk. You can carry it easily during long sessions. The build includes 15 glass elements in 12 groups. This construction helps manage aberrations while keeping the physical profile manageable. The lens features a T-stop range from T3.1 to T32. It uses 9 diaphragm blades for aperture control. The Cine DS line includes unified gears for follow-focus systems. This design choice supports video work where smooth focus pulling is essential. You benefit from consistent handling across different lenses in the series. Dual focusing scales are present. These scales aid precise manual focusing, which is critical for macro work. The minimum focusing distance is 1.0 ft. This close proximity allows for detailed macro shots. The Ultra Multi-Coated glass reduces flare and ghosting. This coating improves image clarity in challenging lighting. The lens is compatible with Olympus, Panasonic, and Blackmagic cameras. It mounts via the Micro Four Thirds mount. The 16.4-degree angle of view provides a narrow perspective. This angle isolates subjects effectively. The design prioritizes function over flash. You get a practical tool for video and stills. The layout supports professional workflows. The weight distribution aids stability. You can trust the build for daily use.

Setup and daily use notes

Setup begins with matching the lens mount to your camera body. This specific listing is for the Micro Four Thirds version, which fits Olympus, Panasonic, and Blackmagic Pocket Cinema Cameras. You simply align the mount marks and twist until it locks. The lens features unified gears along the barrel. This design allows you to attach follow-focus units or gear drives without removing the lens from the camera. It simplifies rigging for video work.

The lens uses a manual focus system. It includes dual focusing scales for precise adjustments. You control aperture and focus entirely by hand. There is no electronic communication with the camera body. This means you must use the camera’s live view or an external monitor to check focus. The 9-blade diaphragm creates a smooth aperture ring click. This helps in maintaining consistent exposure during manual adjustments.

For daily use, the 100mm focal length provides a narrow 16.4-degree angle of view. This compresses background elements, isolating your subject effectively. The minimum focusing distance of 1.0 ft. allows for close-up macro shots. The 15 glass elements in 12 groups help manage aberrations. The Ultra Multi-Coated glass reduces flare and ghosting. You get consistent color matching across the Cine DS line if you use multiple lenses. The compact size and moderate weight make it stable on a tripod or gimbal. It is a practical tool for controlled lighting environments where manual control is preferred.

Before You Buy This Lens

Owning this lens means planning for your camera system. You must ensure your body uses the Micro Four Thirds mount. This listing fits Olympus, Panasonic, and Blackmagic Pocket Cinema Cameras. If you use Sony or Canon bodies, you need a different variation. The lens uses unified gears for follow focus rigs. You may need compatible cage accessories if you plan to mount external focus motors. The lens is built for full-frame sensors but mounts on MFT bodies. This means you get a tighter field of view than on full-frame cameras. Keep the front element clean. The Ultra Multi-Coated glass helps with flare resistance, but dust still affects image quality. Store it in a dry case. This telephoto macro option sits alongside other Rokinon Cine DS lenses. It offers a specific 100mm reach. Check if another focal length better suits your typical shooting distance. This lens is not for wide-angle scenes.

Check before you buy

• Verify your camera uses the Micro Four Thirds mount.
• Check if you need follow focus gear for the unified gears.
• Confirm you want a 100mm telephoto macro reach.
• Ensure you have a compatible camera body for this variation.

The product at a glance

1

Rokinon Cine DS 100mm T3.1 Macro Lens

Best for: Micro Four Thirds manual video macro work

Lens Mount

Micro Four Thirds

Focal Length

100mm

Maximum Aperture

T3.1

Sensor Format

Full Frame

Minimum Focusing Distance

1.0 ft.

Color

Black

View on Amazon: Rokinon Cine DS 100mm T3.1 Macro Lens Affiliate link

This Rokinon Cine DS 100mm T3.1 lens is built for Micro Four Thirds cameras. It offers a 16.4-degree angle of view and a minimum focusing distance of just 1.0 ft. The lens uses 15 glass elements in 12 groups and features a T-stop range from T3.1 to T32. It includes unified gears and dual focusing scales for consistent handling. You get Ultra Multi-Coated glass to manage flare. This telephoto macro option suits videographers needing precise manual control.

Pros

• 100mm focal length with 16.4-degree angle of view
• 1.0 ft minimum focusing distance for macro work
• T3.1 to T32 aperture range with 9 diaphragm blades
• Unified gears and dual focusing scales for cinema use

Cons

• Micro Four Thirds mount limits use to specific camera systems
• 1.6 pounds weight adds bulk to small mirrorless bodies
• T3.1 maximum aperture is slower than many fast primes

Good fit if

• You shoot video on Micro Four Thirds cameras
• You need close-focusing capability for macro shots
• You want unified gear placement for follow focus rigs

Skip if

• You use Sony E, Canon, or Nikon mount cameras
• You need a lightweight lens for travel
• You require autofocus for fast action

Verdict: Rokinon Cine DS 100mm T3.1 fits Micro Four Thirds videographers who need manual focus precision and macro reach. It is not suitable for other mounts or photographers seeking autofocus speed.

Specifications side by side

Frequently asked questions

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