Sirui Astra AF 100mm T1.8 1.33x Full-Frame Anamorphic Lens

Sirui Astra AF 100mm T1.8 1.33x Full-Frame Anamorphic Lens

In The Box

• Sirui Astra AF 100mm T1.8 1.33x Full-Frame Anamorphic Lens
• Lens Cap
• Lens Cleaning Cloth
• Carrying Bag

Sirui Astra AF 100mm T1.8 1.33x Full-Frame Anamorphic Lens

The Sirui Astra 100 mm T1.8 1.33× AF lens is the telephoto prime in Sirui’s Astra Series — offering full-frame anamorphic character in a long-reach format. With a constant T1.8 aperture, this lens allows for beautifully shallow depth of field, stylized oval bokeh, and rich cinematic visuals, even in lower light. The 1.33× squeeze gives a widescreen, 2.35:1 aspect ratio when de-squeezed from 16:9, preserving the classic widescreen anamorphic feel.

Thanks to its STM autofocus motor, you get fast, smooth, and quiet focusing, with the flexibility to switch to manual focus via an AF/MF switch. There’s also an AF lock (FN) button, iris lock, and the ability to use either stepped (click) or de-clicked aperture, making it usable both for run-and-gun shooters and film-style workflows.

Built with a rugged aluminum-alloy body and featuring dust, dirt, and raindrop resistance, the Astra 100mm is robust enough for serious production environments. As with other Astra lenses, you can choose between Blue or Neutral flare versions to match your creative vision. The lens uses a 67 mm filter thread, making it compatible with standard cinematic filters.

Key Features

• 1.33× anamorphic squeeze → creates ~2.35:1 cinematic aspect ratio
• Full-frame coverage (44 mm image circle)
• Constant T1.8 aperture (T1.8–T22)
• Autofocus + Manual Focus via STM motor
• AF/MF switch, AF lock (FN), iris lock, and click on/off aperture
• Two flare styles: Blue or Neutral
• Optical construction: 18 elements (5 cylindrical)
• Minimum focus distance: 0.7 m (per Sirui spec)
• Maximum magnification: 1:7.5 (V) / 1:10.0 (H)
• Field of view (Full Frame): ~18.4° V / 27.4° H / 32.3° D
• Filter thread: M67 × 0.75
• Focus ring rotation: 136°
• Diameter: 72 mm outer
• Length: E-mount 135.3 mm / Z-mount 137.3 mm / L-mount 133.2 mm
• Weight: E ~700g, Z ~716g, L ~705g
• Build: Aluminum alloy, weather-resistant (dust, dirt, raindrop)

Best Suitable

• Narrative and independent filmmakers who need a long anamorphic prime
• Portraits, close-ups, and telephoto shots with cinematic compression
• Solo shooters or small crews who benefit from autofocus
• Mirrorless full-frame camera users (E, Z, and L mounts)
• Filmmakers wanting consistent look & control across a 50 / 75 / 100 mm anamorphic set
• Projects that benefit from stylized flares (blue) or more natural flare (neutral)

FAQ – Sirui Astra AF 100mm T1.8 1.33x Full-Frame Anamorphic Lens

Will this lens cover full-frame sensors?

Yes, according to Sirui, the Astra lenses (50/75/100) offer a 44 mm image circle, suitable for full-frame.

What mounts are available for the 100 mm version?

Sirui offers the Astra Series in Sony E, Nikon Z, and L-mount.

Can I switch between autofocus and manual focus?

Yes, the lens has an AF/MF switch.

What is the minimum focusing distance?

For the 100 mm version, it’s 0.7 m (per Sirui spec).

Does the aperture have click?

Yes, you can toggle between stepped (click) and stepless (de-clicked) aperture, and you also have an iris lock.

How heavy is the lens?

Around 700 g (E-mount), 716 g (Z-mount), 705 g (L-mount).

Specifications