Fixed Focal Length Lenses

Fixed focal length lenses

Avantier produces custom and stock fixed focal length lenses for robotics, machine vision, and other imaging applications, engineered to perform reliably at a predetermined focal length.

A fixed focal length lens — also called a prime lens, factory automation (FA) lens, or C-mount lens when built with a C-mount interface — is a multi-element assembly with a constant focal length and a single angular field of view, built for direct integration into imaging systems. Focal length is the distance from the lens to the point where the image forms most sharply, and it determines both magnification and angle of view.

Key characteristics:

No zoom capability, but not limited to a single working distance
Defined by an optimal working distance and a minimum working distance, with no fixed maximum — supports imaging at both close range and farther distances (distant objects appear smaller in frame)
Typically built with larger maximum apertures, supporting wider fields of view and greater light throughput in low-light conditions

Custom Fixed Focal Length Lens Specification

Specification	Parameter
Field of View (FOV)	Customizable; typical diagonal FOV from 10° to 120° (depends on sensor size and focal length)
Sensor Format Max	Up to 4/3″, APS‑C, or Full Frame (35 mm)
Resolution	Up to 12 MP and above (matched to pixel pitch and application)
Focal Length	Custom range: wide‑angle to telephoto (e.g., 4 mm to 300+ mm)
External Dimension	Custom design; typical diameter Φ30–Φ80 mm, length 30–120 mm
Mount Type	C‑Mount, F‑Mount, M42, M58, or custom‑designed interface
Filter Thread	Customized to front barrel size (common sizes: M25.5, M27, M30.5, M37.5, M43, M46, M49, M52, M55, M58, M62, M67, M72, M77, M82, M86, M95, M105, etc.)
f/#	Customizable; typical F1.4–F16, down to F0.95 for low‑light applications
Focusing Range	From minimum working distance to infinity; MWDR varies by design (typical 0.1 m – 5 m)

Stock Fixed Focal Length Lenses

Avaniter offers a range of stock fixed focal length lenses designed to meet various imaging needs. These lenses come in different formats and resolutions, making them suitable for diverse applications.

Explore our stock optics selection, offering standard lenses with customizable mounts and adapters. This not only provides the advantage of shorter lead times but also delivers cost-effective solutions for your optical requirements.

Part Number	Sensor Format Max	Resolution	Focal Length (mm)	External Dimension	Mount	Filter Thread	F/#	Focusing Range	Price(USD)	Delivery Time
AVTBC-1001	2/3″	3MP	12	37.9x34x38.5	C	M30.5×0.5MM	F1.4 – C	0.15M – ∞	$220.00	One Week
AVTBC-1002	2/3″	3MP	16	38x34x38.5	C	M30.5×0.5MM	F1.4 – C	0.30M – ∞	$220.00	One Week
AVTBC-1003	2/3″	3MP	25	40x34x38	C	M30.5×0.5MM	F1.4 – C	0.25M – ∞	$220.00	One Week
AVTBC-1004	2/3″	3MP	35	38.5x34x38.5	C	M30.5×0.5MM	F1.4 – C	0.30M – ∞	$220.00	One Week
AVTBC-1005	2/3″	3MP	50	45.5x34x40	C	M30.5×0.5MM	F1.4 – C	0.50M – ∞	$220.00	One Week
AVTBC-1006	2/3″	10MP	8	68.5x40x35	C	M37x0.5MM	F2.4-F11	0.10M – ∞	$296.00	One Week
AVTBC-1007	2/3″	10MP	12	49.5×36.8×33.5	C	M30.5×0.5MM	F1.8-F22	0.10M – ∞	$255.00	One Week
AVTBC-1008	2/3″	10MP	16	64.5×36.8×42.37	C	M34x0.5MM	F1.6-F22	0.20M – ∞	$255.00	One Week
AVTBC-1009	2/3″	10MP	25	37×33.8×30	C	M30.5×0.5MM	F1.8-F22	0.15M – ∞	$255.00	One Week
AVTBC-1010	2/3″	10MP	35	35.4×33.8×30	C	M30.5×0.5MM	F2.0-F22	0.20M – ∞	$255.00	One Week
AVTBC-1011	2/3″	10MP	50	48×36.8×36	C	M34x0.5MM	F2.4-F22	0.20M – ∞	$255.00	One Week
AVTBC-1013	1″	5MP	12	63.32x43x50.35	C	None	F1.6-F22	0.2M – ∞	$330.00	One Week
AVTBC-1014	1″	5MP	16	61.8x44x50	C	M37.5×0.5MM	F1.6-F22	1.0M – ∞	$290.00	One Week
AVTBC-1015	1″	5MP	25	53x44x50.35	C	M39x0.5MM	F1.6-F22	1.0M – ∞	$290.00	One Week
AVTBC-1016	1″	5MP	35	54.48x44x50.35	C	M39x0.5MM	F1.4-F22	1.0M – ∞	$290.00	One Week
AVTBC-1017	4/3″	12MP	8	85x70x40	C	M67x0.75MM	F2.8-F22	0.25M – ∞	$485.00	One Week
AVTBC-1018	4/3″	12MP	12	85x70x40	C	M67x0.75MM	F2.2-F22	0.15M – ∞	$485.00	One Week
AVTBC-1019	4/3″	12MP	16	89.7x60x49.28	C	M58x0.75MM	F2.0-F22	0.10M – ∞	$455.00	One Week
AVTBC-1020	4/3″	12MP	25	86.2x48x52.6	C	M46x0.75MM	F2.0-F22	0.15M – ∞	$455.00	One Week
AVTBC-1021	4/3″	12MP	35	69.5x42x40	C	M37x0.5MM	F2.2-F22	0.20M – ∞	$455.00	One Week
AVTBC-1022	4/3″	12MP	50	72.6x43x41	C	M37x0.5MM	F2.2-F22	0.25M – ∞	$455.00	One Week
AVTBC-1023	4/3″	12MP	65	80x62x62	C	M58x0.75MM	F2.2-F22	0.60M – ∞	$455.00	One Week

Applications of Fixed Focal Length Lenses

Used across machine vision and robotic systems for reliable, consistent imaging — Fixed focal length keeps magnification and field of view constant across repeated cycles, supporting the repeatability automated systems require.
Common in research, medical imaging, surveillance, defense, industrial, and conservation applications, these fields often need lenses matched to a specific working distance and field of view for task-specific setups.
In photography applications, wider apertures produce shallower depth of field, isolating the subject from the background.

Custom Fixed Focal Length Lenses at Avantier

Avantier produces custom fixed focal length lenses for machine vision, robotics, and camera lens applications, including compact lenses for integration into machine vision systems and long-range lenses for applications requiring extended working distances.

Avantier’s custom optics are developed under precision engineering standards and rigorous quality control at every stage of design and production. Contact Avantier to place an order or schedule a consultation to talk about your fixed focal lens application.