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SIRUI 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare)
Product Code: 3267963

SIRUI 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare)

RRP: £689.00 £549.00 Limited stock - selling fast
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The Sirui 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare) offers advanced anamorphic imaging for compact setups. Featuring fast, precise autofocus with an STM stepping motor and eye focus, it ensures sharp focus even in dynamic shots. With a constant 1.33x squeeze for a true 2.35:1 cinematic aspect ratio and a wide T1.8 aperture, it delivers natural neutral flares, hexagonal and elliptical bokeh, and strong low-light performance.

Sirui 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare) Key Features:

  • S35 auto focus anamorphic lens for L-mount cameras
  • Suitable for street, landscape, portrait photography, and more
  • 1.33x constant squeeze ratio for a cinematic look
  • Horizontal field of view equivalent to a 42mm full-frame lens
  • Fast T1.8 aperture for sharp images even in low light
  • Hexagonal elliptical bokeh for a unique look
  • Advanced optical design of 16 elements in 12 groups
  • Includes 1 aspherical and 5 cylindrical lens elements
  • 0.6m minimum focus distance for immersive shooting
  • Rapid autofocus and precise eye focus support
  • STM stepping motor provides fast focus suitable for video
  • Supports autofocus and manual focus to suit your needs
  • Neutral flare suitable for natural and warm shooting
  • Consistent size, shape, and design with lenses in the set
  • Compact size for use with gimbals or professional rigs

Cinematic widescreen in a compact form

Sirui’s 40mm T1.8 1.33X S35 AF lens delivers a cinematic widescreen look with its constant 1.33x squeeze ratio, producing a 2.35:1 aspect ratio in 16:9 recording modes. With a 40mm focal length and a horizontal view equivalent to 42mm on a full-frame lens, it captures expansive views ideal for street, landscape, and portrait photography while maintaining the signature anamorphic depth. Despite its optical performance, it remains compact, measuring just 80mm in diameter and weighing around 614g, making it highly practical for gimbal or handheld work.

Advanced optical design for high-quality imaging

The Sirui 40mm T1.8 1.33X S35 AF lens is designed to produce high-quality images and videos. With a 16-element, 12-group construction, it integrates an aspherical lens to minimise weight and chromatic aberration, alongside five cylindrical elements that control light distribution and maintain accurate anamorphic rendering. With an 11-blade aperture and a fast T1.8 maximum aperture, the lens produces sharp subjects, natural background separation, and cinematic bokeh. When the aperture is fully open, the lens produces a hexagonal, elliptical bokeh. As you stop down to f2.4, the bokeh takes on the signature 1.33x elliptical shape. A 0.6m minimum focus distance further enhances creative framing, enabling immersive shots with strong depth.

Precision autofocus with professional control

Equipped with an STM stepping motor, the Sirui 40mm T1.8 1.33X S35 AF lens achieves rapid and accurate autofocus, supporting eye focus for enhanced stability, even in fast-moving environments. For greater flexibility, AF and MF modes are switchable via dedicated controls, while also offering an on/off switch for stepless aperture to suit your shooting preferences. This ensures both filmmakers and photographers can rely on precise subject tracking while retaining manual focus precision when required.

Designed for consistency across productions

Sirui’s design ensures operational uniformity across the lens set, with standardised 77mm filter threads, aligned gear positions, and consistent colour tones. This allows for quick changes without the need to adjust accessories, whether working with gimbals or matte boxes. The lens also features electronic contacts for EXIF transfer, firmware updates via Type-C, and a robust aluminium alloy body, providing users with reliable performance and practical integration with modern camera systems.

What’s in the box?

  • 1 x Sirui 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare)
  • 1 x Pouch
  • 1 x Strap
  • 1 x Front Lens Cap
  • 1 x Back Lens Cap
  • 1 x Warranty Card

FAQs:

Does the Sirui 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare) cover full-frame sensors?

The Sirui 40mm T1.8 1.33x AF lens is designed for S35/APS-C format coverage with a maximum image circle of 37mm. It can be mounted on full-frame cameras, though some vignetting may occur. This makes it best suited for S35 systems but still adaptable for wider sensor formats if required.

What is the focus throw of the Sirui 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare), and how does it benefit users?

This lens offers a 360° focus throw, providing precise manual control over focus adjustments. The extended rotation is particularly useful for pulling focus in cinematic applications where accuracy is critical. It allows operators to achieve smooth and controlled focus transitions across the entire range.

How does the flare option affect image output?

This version of the lens features a neutral flare, designed to adapt naturally to different light sources without imposing a strong colour cast. It produces warm and realistic highlights that are well-suited for commercial and portrait work. This makes it a strong choice for those seeking cinematic character without stylised blue streaks.

Is the Sirui 40mm T1.8 1.33X S35 AF Lens (L mount, Neutral Flare) compatible with filters?

The Sirui 40mm T1.8 1.33X S35 AF lens has a 77mm threaded filter size. This allows straightforward attachment of ND filters or other accessories without special adaptors. The consistent size across the series also ensures uniformity when swapping between lenses in multi-lens productions.

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Product Specification

Aperture Blades 11
Autofocus Motor STM
Colour Black
Filter Thread [mm] 77
Focal Length ~ Tele [mm] 40.0
Focal Length ~ Wide [mm] 40.0
Included Accessories Pouch, Strap, Front Lens Cap, Back Lens Cap
Lens Elements 16
Lens Groups 12
Lens Mount L-Mount
Max Aperture ~ Tele 1.8
Max Aperture ~ Wide 1.8
MF Switch Yes
Minimum Aperture 22
Minimum Focus Distance [m] 0.60
Sensor Format S35/APS-C
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Your flexible credit options available

Interest Bearing

with a choice of repayment plans over 24 or 36 months 13.9% APR (representative)

Buy now pay later

36 month loan with a six month deferral period, 18.9% APR (representative)

Interest Bearing Finance

This option comprises term loan with a choice of repayment plans over:

  • 24 months
  • 36 months

The balance of the finance agreement is payable directly to Novuna Consumer Finance in equal monthly instalments by monthly direct debit. The direct debit payments will commence at the end of the first month following receipt of your goods. The interest rate charged is 13.9% APR (representative). Late payment and early repayment penalties apply; full details of these will be provided in the loan agreement pack.

For customers based in the Channel Island, please call us to apply for finance

  24 Months  36 Months 
Cash price  £549.00  £549.00
Deposit £0.00 £0.00
Loan Amount £549.00 £549.00
Monthly Instalment 23 x £26.12 35 x £18.52
Final Instalment £26.12 £18.52
Total Amount Repayable £626.88 £666.72
Representative 13.9% APR 13.9% APR

Buy now pay later

The Buy Now Pay Later option comprises a 36 month loan following a six month deferral period.

During the six-month deferral period, it is possible to pay off the loan, either by way of a lump sum or in smaller amounts. If the loan is partially repaid within six months, the remaining interest will be adjusted to reflect the new balance. If the loan is fully repaid within the six-month deferral period, then no interest is payable, however, a £29 early settlement fee is payable in respect of repayments within these six months.

Following the six-month deferral period, Novuna Personal Finance will initiate a monthly direct debit payment for the remaining duration of the loan. Interest will be charged at a rate of 18.9% APR (representative) on outstanding balances (backdated to the first date of the loan). Novuna Personal Finance will send a reminder letter approximately one month before the six-month deferral period is due to elapse.

For customers based in the Channel Island, please call us to apply for finance

  Balance settled in full within the six month deferral period Balance NOT settled in full within the six month deferral period
Cash price £300 £300
Deposit £0 £0
Loan Amount £300 £300
Settlement fee £29 £0
Settlement payment £329 -
Monthly Instalment - 36 x £11.57
Total Amount Repayable £329 £416.52
Representative 18.9% APR 18.9% APR


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Product Code: 3267963-wex Manufacturers Part Number: 40AF133X-LN