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Capture cinematic widescreen footage with the aid of an autofocus option using the Sirui Nikon Z-mount 40mm T1.8 1.33x S35 AF Anamorphic Lens. This innovative prime lens uses an STM motor for fast, accurate autofocus while offering manual focus for more complicated shots handled by a camera assistant/focus puller. It produces blue flares that are a classic feature of the anamorphic format and has a fast T1.8 maximum aperture lens that is ideal for low-light capture and for creating distinctive bokeh effects.
Capture cinematic widescreen footage with the aid of an autofocus option using the Sirui Nikon Z-mount 40mm T1.8 1.33x S35 AF Anamorphic Lens. This innovative prime lens uses an STM motor for fast, accurate autofocus while offering manual focus for more complicated shots handled by a camera assistant/focus puller. It produces blue flares that are a classic feature of the anamorphic format and has a fast T1.8 maximum aperture lens that is ideal for low-light capture and for creating distinctive bokeh effects.
Super 35 Coverage
This anamorphic prime lens has a 1.33x squeeze factor.
It produces a widescreen 2.35:1 aspect ratio when shooting in a 16:9 mode.
Manual and Autofocus
The autofocus feature now lets you capture anamorphic footage as quickly as when using spherical lenses.
Select manual or autofocus using the switch on the lens.
Use the AFL button to lock the autofocus or create a custom setting.
High Optical Performance
One aspherical and five cylindrical elements contribute to the high optical quality of this lens.
Focus breathing and chromatic aberration are well controlled.
Supports EXIF metadata transfer and has a USB-C port for firmware upgrading.
Ideal for Low-Light Shooting
The maximum T1.8 aperture enables you to capture low-light scenes using lower camera ISO settings.
Choose between stepped and stepless aperture settings for smooth exposure adjustments.
Sharpness and optical quality are maintained even in night scenes.
Flares and Distinctive Bokeh
Shoot with a wide-open aperture to create a distinctive hexagonal bokeh.
Stop down to get an oval bokeh that is typical of the anamorphic look.
Create notable blue flares for an intriguing, classic sci-fi look.
All Around Prime
This all-around 40mm lens is ideal for portraits, landscapes, street scenes, and establishing shots.
Horizontally equivalent to 42mm in full-frame format.
Compact Cine-Style Form
This prime lens features a compact, lightweight design suitable for handheld and gimbal work.
Cine-style features include an 80mm front outside diameter, standard 0.8 MOD gears, and wide 360° focus rotation.
Sirui 40mm T1.8 Anamorphic AF Specs
Key Specs
Focal Length
40mm
Maximum Aperture
T1.8
Lens Mount
Nikon Z
Lens Format Coverage
Super35/APS-C (37 mm Image Circle)
Filter Thread
77 mm x 0.75
Image Stabilization
No
Electronic Communication
Yes
Focal Length
40mm
Maximum Aperture
T1.8
Minimum Aperture
T22
Lens Mount
Nikon Z
Horizontal Squeeze (Anamorphic)
1.33x
Flare Color
Blue
Lens Format Coverage
Super35/APS-C (37 mm Image Circle)
Angle of View
Super 35 Horizontal: 55° Vertical: 25.4°
Optical Design
16 Elements in 12 Groups
Filter Thread
77 mm x 0.75
Minimum Focus Distance
1.97' / 60.05 cm
Aperture/Iris Blades
11
Image Stabilization
No
Gear Standard
0.8 MOD
Gear Rotation
Focus: 360°
Electronic Communication
Yes
Camera Connection
Flat Contacts (EXIF) Data
Diameter
Front: 3.1" / 80 mm
Length
Not Specified by Manufacturer
Weight
1.4 lb / 614 g
Packaging Info
Package Weight
3.055 lb
Box Dimensions (LxWxH)
9.2 x 6.4 x 6"
Sirui 40mm T1.8 Anamorphic AF Reviews
Poor build quality
By Mike
Rated 2 out of 5
Date: 2026-03-29
The back of the lens from the aperture ring to the mount became loose, so the lens can no longer mount solidly to the camera. This also causes the plane of focus to shift as the lens wiggles.
The autofocus works well enough (except for the shifting plane of focus). The image quality is decent, especially for an anamorphic lens in this price range. I would have rated it 4-stars if not for the poor build quality.
Good not great
By Robert
Rated 4 out of 5
Date: 2025-05-12
I use this on a sony FX30. This is one of the first anamorphic AF systems- I am sure it ill get better but it is lacking now. AF does not lock on the subject- it will hunt around even with a static subject.
I found myself shooting in MF - kind of defeats the reason I bought this lens.
Image quality is good enough.
See any errors on this page?
When mounted on a Fujifilm X body are you be able ...
When mounted on a Fujifilm X body are you be able to see both "Body" and "Lens" firmware versions?
Asked by: Gary
Only native Fuji lenses will display their firmware version in the camera menu. Third-party lenses, such as the Sirui 40mm T1.8 1.33x S35 AF Anamorphic Lens (FUJIFILM X, Neutral Flares), will not show firmware information in the camera’s menu.
Answered by: Chris H
Date published: 2025-07-05
On an APS-C camera, such as the Sony FX30, what ...
On an APS-C camera, such as the Sony FX30, what would be the equivalent focal length of this 40mm Sirui Anamorphic Lens?
Asked by: Craig
The Sirui 40 mm T1.8 1.33x S35 AF Anamorphic Lens (Sony E, Neutral Flares) would have a 60 mm view on the APS-C sensor of the Sony FX30.
Answered by: Chris H
Date published: 2025-09-01
I am not seeing Nikon Full Frame cameras showing ...
I am not seeing Nikon Full Frame cameras showing up as "compatible" to this lens. I have cameras like Z6III. Why is that?
Asked by: Taka
The Sirui 40mm T1.8 1.33x S35 AF Anamorphic Lens (Sony E, Blue Flares) is an S35 lens and will not support a full-frame camera. However, most cameras have APS-C or S35 modes, and if you use your camera in crop sensor mode, the lens will work. Also, make sure to purchase the Z-mount lens model. See below:
Sirui 40mm T1.8 1.33x S35 AF Anamorphic Lens (Nikon Z, Blue Flares), BH # SI40AF133XZB
Answered by: Elliot A
Date published: 2025-11-03
Can this lens (in any of its formats) be adapted ...
Can this lens (in any of its formats) be adapted to a Canon RF camera?
Asked by: Craig
No, unfortunately, the Sirui 40 mm T1.8 1.33x S35 AF Anamorphic Lens in Leica L, Sony E, Nikon Z, FUJIFILM X, or Micro Four Thirds does not adapt to or have an adapter for connecting to an RF-mount camera.
Answered by: Elliot
Date published: 2025-06-12
The angle of view specs for the MFT version are ...
The angle of view specs for the MFT version are the same as the E-mount version. Is the MFT crop factor taken into account here?
Asked by: David
When using the Sirui 40mm T1.8 1.33x S35 AF Anamorphic Lens (Micro Four Thirds, Neutral Flares) and all other lenses, the focal length of a lens does not change when used on a different system; it is the field of view compared to a full frame that changes. Crop factor compared to 35mm equivalent is only relevant when comparing to full frame.
Answered by: Elliot
Date published: 2025-09-01
Is this compatible with the Z-Mount Red Komodo X?
Is this compatible with the Z-Mount Red Komodo X?
Asked by: Daniel
The actual answer is "not yet" - Sirui has not released the appropriate firmware for this to work on the Komodo-X Z-mount (their response to me). The lens will mount, but will have no power and will not be recognized by the KX. Without power, the iris is stuck at f/22, cannot be adjusted, and the lens cannot even be manually focused.
Answered by: Ron
Date published: 2025-07-12
Can you change the mount like you can do on some ...
Can you change the mount like you can do on some of the Siri?
Asked by: Paul
The mount of the Sirui 40mm T1.8 1.33x S35 AF Anamorphic Lens (Leica L, Blue Flares) cannot be changed or swapped.
