SIRUI Aurora 35mm vs 85mm: Which Full-Frame Lens Should You Buy?

Choosing a SIRUI full-frame lens is no longer simply a matter of deciding which focal length you prefer.

SIRUI now offers conventional autofocus lenses for photography and hybrid shooting alongside specialized anamorphic lenses designed for cinematic production. These products may share the same brand and full-frame coverage, but they are built for very different workflows.

For this guide, we selected five options that illustrate those differences: the SIRUI Aurora 35mm F1.4, Aurora 85mm F1.4, Saturn 35mm T2.9 1.6x, Astra 50mm T1.8 1.33x and Venus 50mm T2.9 1.6x.

The Aurora lenses are the most straightforward choices for photographers. The Saturn emphasizes lightweight manual-focus anamorphic filmmaking. The Astra combines anamorphic capture with autofocus, while the Venus is aimed at a more traditional manual-focus cinema workflow.

Review note: Blog60s has not conducted hands-on optical, autofocus, flare, distortion, focus-breathing or long-term durability testing of all five lenses in this guide. This article is based on current manufacturer specifications and official product information. Manufacturer performance claims should not be interpreted as independent Blog60s test results.

Prices, mounts and product availability can change, so always verify the exact configuration before purchasing.

Quick Comparison: 5 SIRUI Full-Frame Lenses

Lens	Type	Aperture	Focus	Best For
Aurora 35mm	Spherical	F1.4	AF/MF	Street, travel, everyday
Aurora 85mm	Spherical	F1.4	AF/MF	Portraits
Saturn 35mm	1.6x Anamorphic	T2.9	Manual	Lightweight filmmaking
Astra 50mm	1.33x Anamorphic	T1.8	AF/MF	AF anamorphic filmmaking
Venus 50mm	1.6x Anamorphic	T2.9	Manual	Traditional cinema workflow

The biggest difference is not simply focal length.

The first decision should be whether you need a conventional spherical photography lens or an anamorphic cinema lens. After that, consider focal length, autofocus, aperture, size and production workflow.

1. SIRUI Aurora 35mm F1.4 — Best for Everyday Photography

The Aurora 35mm F1.4 is the most versatile conventional photography lens in this group.

Its 35mm focal length provides a moderately wide field of view on a full-frame camera, making it suitable for street photography, travel, environmental portraits, documentary work and everyday video.

SIRUI uses a 16-element, 11-group optical construction with 13 aperture blades. The lens combines a fast F1.4 maximum aperture with autofocus and manual-focus operation.

A built-in STM motor handles autofocus. SIRUI also provides an AF/MF switch, customizable FN button, iris lock and click/de-click aperture control.

Minimum focusing distance is 0.35m, while maximum magnification is listed at 0.14x.

The 62mm filter thread is also reasonably compact for an F1.4 full-frame prime.

Weight depends slightly on mount, with SIRUI listing approximately 490g for E mount and X mount and 495g for L mount.

For photographers who want one fast prime without moving into a specialized cinema workflow, the Aurora 35mm is the most natural starting point in this group.

Aurora 35mm Pros

• Versatile 35mm focal length
• Fast F1.4 aperture
• Autofocus and manual focus
• STM focus motor
• 13-blade aperture
• 0.35m minimum focus
• Click/de-click aperture control
• 62mm filter thread
• USB-C firmware updates
• Relatively lightweight design

Aurora 35mm Cons

• Not an anamorphic lens
• 35mm may be wider than some portrait photographers prefer
• No optical stabilization listed
• Autofocus performance can depend on camera body and firmware

Best suited for: street photography, travel, environmental portraits, documentary work, everyday photography and hybrid photo/video creators.

For a deeper look at this lens, read our SIRUI Aurora 35mm F1.4 Review.

2. SIRUI Aurora 85mm F1.4 — Best for Portrait Photography

The Aurora 85mm F1.4 follows the same general philosophy as the 35mm but moves into classic portrait territory.

An 85mm focal length provides tighter framing and greater working distance than 35mm on a full-frame camera. Combined with the F1.4 maximum aperture, that makes it particularly relevant for portraits, weddings and subject-isolation photography.

Its optical construction consists of 14 elements in 9 groups, including one aspherical element, two ED elements and three HRI elements according to SIRUI.

The lens uses a 15-blade aperture, more than the 13 blades in the Aurora 35mm.

Autofocus and manual focus are supported, with an STM-based autofocus system. The lens also provides an AFL/custom-function button, AF/MF switch and click/de-click aperture control.

Minimum focusing distance is 0.85m and maximum magnification is 0.1152x.

The E-mount version weighs approximately 540g, while SIRUI lists the X and L versions at about 550g.

Aurora 85mm Pros

• Classic 85mm portrait focal length
• Fast F1.4 aperture
• Autofocus and manual focus
• 15 aperture blades
• 67mm filter thread
• Customizable lens controls
• USB-C firmware support
• Full-frame coverage
• Relatively manageable weight for an 85mm F1.4

Aurora 85mm Cons

• Less convenient in small rooms than a 35mm lens
• 0.85m minimum focusing distance
• Not intended for macro photography
• Not anamorphic
• Less versatile for general walk-around photography than 35mm

Best suited for: portraits, weddings, events, subject isolation and photographers who want a fast short-telephoto prime.

If you are deciding between the two Aurora primes, see our SIRUI Aurora 85mm F1.4 Review and SIRUI Aurora 35mm vs 85mm comparison.

3. SIRUI Saturn 35mm T2.9 1.6x — Best Lightweight Anamorphic Option

The Saturn 35mm is where this guide moves from conventional photography into dedicated anamorphic filmmaking.

It is a full-frame 1.6x anamorphic lens with a T2.9 maximum aperture.

Instead of capturing an ordinary spherical image, the anamorphic optical system compresses a wider horizontal field of view onto the sensor. The image is then de-squeezed during monitoring or post-production.

SIRUI specifies a constant 1.6x squeeze ratio, a T2.9–T16 aperture range and a 10-blade iris.

The Saturn is manual focus rather than autofocus.

Its 35mm version has a minimum focusing distance of 0.9m and a 58mm filter thread.

One of the Saturn series' defining characteristics is its use of a carbon-fiber front barrel. This helps keep the lens relatively compact and lightweight compared with many traditional full-frame anamorphic cinema lenses.

SIRUI also specifies anamorphic characteristics including oval bokeh and horizontal streak effects. Those are manufacturer-described optical characteristics rather than independently tested Blog60s findings.

Saturn 35mm Pros

• Full-frame coverage
• Constant 1.6x anamorphic squeeze
• Carbon-fiber construction
• Compact cinema-oriented design
• T2.9 maximum aperture
• 10-blade iris
• 58mm filter thread
• Suitable for handheld and gimbal filmmaking
• Stronger anamorphic workflow than conventional spherical lenses

Saturn 35mm Cons

• Manual focus only
• 0.9m minimum focusing distance
• Requires anamorphic monitoring or post-production
• Less convenient for ordinary photography
• Not as fast as the T1.8 Astra

Best suited for: filmmakers wanting a relatively compact full-frame 1.6x anamorphic lens and who are comfortable working with manual focus.

4. SIRUI Astra 50mm T1.8 1.33x — Best for Autofocus Anamorphic Filmmaking

The Astra 50mm takes a different approach to anamorphic filmmaking.

It combines a 1.33x full-frame anamorphic design with autofocus, making it particularly interesting for solo creators and small production teams.

The 50mm model has a fast T1.8 maximum aperture and supports both autofocus and manual focusing.

SIRUI's current Astra lineup uses a constant 1.33x squeeze ratio. When footage is appropriately de-squeezed, the system is designed around widescreen cinematic capture.

The company specifically positions the 1.33x design for obtaining a roughly 2.4:1 widescreen image from common 16:9 acquisition without relying solely on a simple crop.

The Astra also provides modern electronic controls, making it substantially different from traditional manual-focus cinema lenses.

SIRUI's current specifications for the 50mm include a minimum focusing distance of approximately 0.5m.

The combination of T1.8, autofocus and full-frame anamorphic coverage makes the Astra one of the more technologically unusual lenses in this five-model group.

Astra 50mm Pros

• Full-frame anamorphic coverage
• Constant 1.33x squeeze
• Autofocus and manual focus
• Fast T1.8 aperture
• 0.5m minimum focus
• Designed for modern mirrorless filmmaking
• Useful for solo creators
• Anamorphic look without requiring manual focus at all times

Astra 50mm Cons

• More expensive than the Aurora lenses
• Requires an anamorphic workflow
• 1.33x produces different anamorphic characteristics from 1.6x lenses
• More specialized than a conventional 50mm photography lens
• Autofocus performance can depend on camera compatibility and firmware

Best suited for: solo filmmakers, content creators and small crews who want anamorphic capture while retaining autofocus.

5. SIRUI Venus 50mm T2.9 1.6x — Best for a Traditional Cinema Workflow

The Venus 50mm T2.9 is another full-frame anamorphic option, but its purpose differs from the Astra.

Where the Astra integrates autofocus into a modern mirrorless workflow, the Venus is built around a more traditional manual-focus cinema approach.

The 50mm belongs to SIRUI's Venus 1.6x full-frame anamorphic family.

Its constant 1.6x squeeze is stronger than the Astra's 1.33x squeeze, creating a different relationship between horizontal field of view and final de-squeezed image.

The Venus family also covers multiple focal lengths, which matters for filmmakers interested in building a matched anamorphic lens set rather than buying only one lens.

SIRUI currently lists the Venus family with 35mm, 50mm, 75mm, 100mm, 135mm and 150mm options.

Venus 50mm Pros

• Full-frame anamorphic coverage
• Constant 1.6x squeeze
• T2.9 maximum aperture
• Manual cinema-style workflow
• Part of a larger matched lens family
• Useful for dedicated filmmaking rigs
• Strong anamorphic visual characteristics

Venus 50mm Cons

• Manual focus
• More specialized than the Aurora series
• Requires de-squeeze monitoring or post-production
• Less convenient for solo autofocus-dependent shooting
• Not intended as a general-purpose photography lens

Best suited for: filmmakers who prefer manual cinema controls and want access to a broader family of matching full-frame 1.6x anamorphic focal lengths.

Spherical vs Anamorphic: What Is the Difference?

This is the most important distinction between these five lenses.

The Aurora 35mm and Aurora 85mm are spherical lenses.

They produce the conventional image format expected by photographers and most videographers. No anamorphic de-squeeze is required.

The Saturn, Astra and Venus are anamorphic lenses.

An anamorphic lens compresses a wider horizontal field of view onto the camera sensor. That image must then be appropriately de-squeezed for monitoring, editing or final delivery.

Anamorphic optics can also produce visual characteristics such as oval bokeh and horizontal flare patterns.

That does not mean anamorphic is automatically better.

It is a creative choice that comes with a different shooting and post-production workflow.

Autofocus vs Manual Focus

Focus method creates another clear division.

The Aurora 35mm, Aurora 85mm and Astra 50mm support autofocus.

The Saturn 35mm and Venus 50mm are manual-focus cinema lenses.

Autofocus is useful for photographers capturing moving subjects, event shooters and solo video creators who cannot continuously operate the camera and pull focus at the same time.

Manual focus remains common in cinema production because it gives the operator or focus puller deliberate control over focus transitions.

Choose based on how you actually work rather than assuming one system is inherently more professional.

35mm vs 50mm vs 85mm

Focal length still matters after choosing your lens type.

35mm

For conventional photography, 35mm is a versatile focal length for street, travel, documentary work and environmental portraits.

The Saturn 35mm behaves differently because its anamorphic optics capture a wider horizontal field of view after de-squeezing.

50mm

50mm sits between wide-angle storytelling and tighter portrait framing.

Both Astra and Venus use 50mm options, but their workflows differ significantly because the Astra combines 1.33x anamorphic capture with autofocus while Venus uses a 1.6x manual-focus cinema approach.

85mm

85mm is the most portrait-oriented focal length in this comparison.

For conventional portrait photography, the Aurora 85mm is the obvious candidate among these five lenses.

Which SIRUI Full-Frame Lens Should You Choose?

Choose the Aurora 35mm F1.4 if:

You want a versatile autofocus prime for street photography, travel, documentary work, environmental portraits and everyday shooting.

For a photographer who wants only one lens from this list, it is the most flexible starting point.

Choose the Aurora 85mm F1.4 if:

Portraits and subject isolation are your priorities.

Its combination of an 85mm focal length, F1.4 aperture, autofocus and 15-blade iris is specifically suited to that type of shooting.

Choose the Saturn 35mm T2.9 if:

You want to enter full-frame 1.6x anamorphic filmmaking with a relatively lightweight manual-focus lens.

It is especially interesting for handheld and gimbal-oriented cinema setups.

Choose the Astra 50mm T1.8 if:

You want anamorphic filmmaking without giving up autofocus.

Its T1.8 aperture and AF/MF operation make it particularly relevant to solo filmmakers and modern mirrorless production.

Choose the Venus 50mm T2.9 if:

You prefer a traditional manual-focus cinema workflow and may eventually want to build a larger matched set of 1.6x anamorphic lenses.

What to Check Before Buying

Camera Mount

Do not purchase a lens based only on its focal length and name.

Verify that the exact mount offered is compatible with your camera body.

Mount availability differs between SIRUI product families and can change over time.

Full Frame vs APS-C

These lens families are designed around full-frame coverage, but some mounts or camera combinations may also involve crop-sensor bodies.

A crop sensor changes the effective field of view compared with full frame.

Autofocus Compatibility

An autofocus lens does not guarantee identical AF behavior with every camera.

Camera body, firmware, AF mode and lens firmware can all influence operation.

Check current SIRUI compatibility information before buying for a specific camera.

Anamorphic Monitoring

Saturn, Astra and Venus require an anamorphic workflow.

Your camera, monitor or editing software needs to display or process the appropriate de-squeeze ratio if you want to view the intended proportions correctly.

Filter Size

Filter compatibility matters if you already own ND, diffusion or polarizing filters.

For example, the Aurora 35mm uses a 62mm filter thread, Aurora 85mm uses 67mm and Saturn 35mm uses 58mm according to SIRUI's current specifications.

Are SIRUI Full-Frame Lenses Worth Considering?

SIRUI's full-frame lineup is interesting because it now addresses several very different creator workflows.

Photographers can choose conventional fast autofocus primes through the Aurora series.

Filmmakers can choose a lightweight manual anamorphic system through Saturn, a more traditional 1.6x cinema ecosystem through Venus or an autofocus anamorphic workflow through Astra.

That variety also means buyers need to understand what they are purchasing.

A cinema lens is not automatically an upgrade over a photography lens, and a larger anamorphic squeeze ratio is not automatically better.

The right choice depends on whether you prioritize photography, autofocus, manual cinema operation or anamorphic capture.

Frequently Asked Questions

Which SIRUI lens is best suited to portraits?

The Aurora 85mm F1.4 is the most portrait-oriented conventional photography lens in this group.

It combines an 85mm focal length with an F1.4 maximum aperture and autofocus.

Which lens is better for street and travel photography?

The Aurora 35mm F1.4 is the most straightforward option because its 35mm field of view is more versatile for environmental scenes, travel and everyday photography.

Which lenses are anamorphic?

The Saturn 35mm, Astra 50mm and Venus 50mm are anamorphic lenses.

The Aurora 35mm and Aurora 85mm are conventional spherical lenses.

Which anamorphic lens supports autofocus?

The Astra series supports both autofocus and manual focus.

The Saturn and Venus options discussed here use manual focusing.

What does 1.6x anamorphic mean?

A 1.6x anamorphic lens optically compresses a wider horizontal field of view onto the sensor.

The image must then be de-squeezed by the appropriate factor for normal viewing.

Is 1.6x better than 1.33x?

Not automatically.

They produce different framing and anamorphic characteristics and require different workflow considerations.

Choose based on the image style and production process you want rather than simply selecting the larger number.

Do photographers need an anamorphic lens?

Usually not for conventional photography.

If your primary goal is still photography, an Aurora lens provides a much more straightforward workflow.

Anamorphic lenses make the most sense when the cinematic widescreen look is a deliberate creative requirement.

Final Thoughts

These five lenses demonstrate how broad SIRUI's full-frame lineup has become.

The Aurora 35mm F1.4 is the most versatile conventional autofocus option here, making it a strong fit for street, travel and everyday photography.

The Aurora 85mm F1.4 moves toward portraits and subject isolation.

The Saturn 35mm T2.9 1.6x provides a compact route into manual-focus full-frame anamorphic filmmaking.

The Astra 50mm T1.8 1.33x combines anamorphic capture with autofocus and a fast T1.8 aperture, making it particularly interesting for solo creators.

The Venus 50mm T2.9 1.6x is better aligned with a traditional manual-focus cinema workflow and a broader matched anamorphic lens family.

Before choosing between them, answer three questions: Are you primarily shooting photos or video? Do you need autofocus? Do you actually want an anamorphic workflow?

Those answers will narrow this five-lens lineup much more effectively than comparing price tags alone.