{"id":129548,"date":"2026-06-25T03:27:56","date_gmt":"2026-06-25T03:27:56","guid":{"rendered":"https:\/\/www.seeedstudio.com\/blog\/?p=129548"},"modified":"2026-06-25T05:41:27","modified_gmt":"2026-06-25T05:41:27","slug":"how-to-choose-the-right-m12-lens-for-your-recamera","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2026\/06\/25\/how-to-choose-the-right-m12-lens-for-your-recamera\/","title":{"rendered":"How to choose the Right M12 Lens for Your reCamera"},"content":{"rendered":"\n

Choosing the right M12 lens reCamera<\/strong> combination is critical for any AI camera project. Even the most powerful edge AI vision pipeline can fail if the lens captures the wrong area, misses detail, or struggles in your lighting conditions. For reCamera users, the lens is where photons meet silicon \u2014 and getting that interface right matters.<\/p>\n\n\n\n

reCamera is Seeed Studio\u2019s open-source AI camera platform, built for developers who want edge AI vision without stitching together solutions. It runs Linux, supports popular inference frameworks, and comes in several form factors \u2014 from the compact reCamera 2002 series to the industrial-grade HQ PoE models. One feature shared across the lineup is the standard M12 lens mount, a threaded interface that gives you real flexibility in how your camera sees the world.<\/p>\n\n\n\n

We\u2019re introducing four new M12 lenses for reCamera, covering focal lengths from an ultra-wide 1.8mm fisheye to a 22mm ultra telephoto. This guide covers what each lens does best, explains the key terminology, and walks through installation.The new M12 lens family for reCamera four focal lengths from fisheye to ultra telephoto<\/p>\n\n\n\n

Meet the New M12 Lens Family for reCamera AI Vision<\/h2>\n\n\n\n
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These four lenses span nearly an order of magnitude in focal length, from ultra-wide panoramic views to tight telephoto magnification. Despite their very different fields of view, they share the same compact form factor \u2014 an M12\u00d70.5 mount, manual focus ring, and a weight of roughly 7 grams each. As a result, changing focal lengths is quick and straightforward: simply unscrew one lens and install another.<\/p>\n\n\n\n

Since each lens costs only $7.90\u2013$13.90, it’s practical to keep multiple options on hand and switch between them whenever project needs change. The standardized M12 mount eliminates the need for adapters or modifications, making lens swaps fast and hassle-free.<\/p>\n\n\n\n

For comparison, this is the image effect of the original lens of reCamera HQ POE. This image and all the images of the following four lenses were taken at a distance of 30 cm from the reCamera packaging box.<\/p>\n\n\n\n

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1.8mm Fisheye Lens \u2014 160\u00b0 HFOV, 5MP, F1.8<\/a><\/h3>\n\n\n\n
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\uff08The above pictures were taken with the lens 30 cm away from the reCamera’s packaging box.\uff09<\/p>\n\n\n\n

With a 160 degree horizontal field of view, this lens captures nearly everything in front of the camera useful when you can\u2019t afford blind spots or when space is too tight to back the camera away from the scene.<\/p>\n\n\n\n

The F1.8 aperture is the fastest in the lineup, letting in more light than the other options. That matters in dim hallways, at night, or anywhere you can\u2019t control lighting. The 5MP resolution gives you enough pixels to run detection models across that massive field of view.<\/p>\n\n\n\n

The trade-off is distortion. Straight lines near the edges curve outward in a characteristic barrel pattern \u2014 an inherent property of ultra-wide optics rather than a flaw. For most AI vision applications, such as people detection and occupancy sensing, distortion is usually a secondary concern compared with field of view and scene coverage.<\/p>\n\n\n\n

It becomes more relevant for measurement, mapping, or other geometry-sensitive tasks. In those cases, distortion can be corrected in software or minimized by choosing a narrower lens.<\/p>\n\n\n\n

Use this lens for: panoramic monitoring, tight indoor spaces, VR\/360 capture, wide-area surveillance, and any application where coverage beats detail.<\/p>\n\n\n\n

2.5mm Wide Angle Lens \u2014 140\u00b0 HFOV, 3MP<\/a><\/h3>\n\n\n\n
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\uff08The above pictures were taken with the lens 30 cm away from the reCamera’s packaging box.\uff09<\/p>\n\n\n\n

The 2.5mm wide angle gives a broad view with noticeably less distortion than the fisheye. Mount it above an entryway, in a hallway, or in a corner to cover the whole space without the extreme curvature of a fisheye.<\/p>\n\n\n\n

At 3MP, the resolution is a step down from the fisheye, but for most detection and classification tasks \u2014 \u201cis there a person in this room?\u201d \u2014 3MP is more than sufficient. With its balanced field of view and broad applicability, this lens is often the go-to choice for general-purpose AI vision deployments.<\/p>\n\n\n\n

Use this lens for: general AI vision, room monitoring, entryways, hallway coverage, and any project where you need width without the fisheye look.<\/p>\n\n\n\n

16mm Telephoto Lens \u2014 20\u00b0 HFOV, 5MP<\/a><\/h3>\n\n\n\n
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\uff08The above pictures were taken with the lens 30 cm away from the reCamera’s packaging box.\uff09<\/p>\n\n\n\n

The 16mm telephoto narrows the field of view to 20 degrees horizontal \u2014 about one-eighth the width of the fisheye \u2014 and pulls distant subjects closer. The 5MP resolution captures fine details: facial features at medium distance, license plate characters, text on labels.<\/p>\n\n\n\n

This lens changes how you think about placement. Instead of mounting high and wide, you position the camera at a distance from a specific choke point \u2014 a gate, a doorway, a production line station. The narrow FOV acts like a spotlight, concentrating your pixels where they matter.<\/p>\n\n\n\n

Use this lens for: license plate recognition, facial recognition at distance, monitoring choke points, and any application where detail in a defined area beats wide coverage.<\/p>\n\n\n\n

22mm Ultra Telephoto Lens \u2014 15\u00b0 HFOV, 2MP<\/a><\/h3>\n\n\n\n
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\uff08The above pictures were taken with the lens 30 cm away from the reCamera’s packaging box.\uff09<\/p>\n\n\n\n

The 22mm ultra telephoto offers the most magnification in the family, with a 15-degree horizontal field of view. This is the lens you reach for when the camera sits far from the target and still needs to capture usable detail \u2014 reading small text from several meters away, inspecting distant equipment, or monitoring a specific point across a large space.<\/p>\n\n\n\n

The 2MP resolution is lower than the fisheye and telephoto, but when concentrated on a 15-degree slice of the world, the effective detail on your target can still be high. Think of it as quality over quantity: fewer total pixels, all pointed where you need them.<\/p>\n\n\n\n

Use this lens for: long-distance monitoring, reading small text or labels from afar, industrial inspection of distant targets, and any scenario where magnification is the priority.<\/p>\n\n\n\n

Lens Comparison at a Glance: How to choose the Right M12 Lens for Your reCamera<\/h3>\n\n\n\n
Lens<\/strong><\/td>Focal Length<\/strong><\/td>HFOV<\/strong><\/td>Resolution<\/strong><\/td>Aperture<\/strong><\/td>Weight<\/strong><\/td>Best For<\/strong><\/td><\/tr>
Fisheye<\/strong><\/td>1.8mm<\/td>160\u00b0<\/td>5MP<\/td>F1.8<\/td>7g<\/td>Panoramic monitoring, tight spaces<\/td><\/tr>
Wide Angle<\/strong><\/td>2.5mm<\/td>140\u00b0<\/td>3MP<\/td>F2.5*<\/td>~7g<\/td>General wide coverage<\/td><\/tr>
Telephoto<\/strong><\/td>16mm<\/td>20\u00b0<\/td>5MP<\/td>F2.0*<\/td>~7g<\/td>Medium-distance detail<\/td><\/tr>
Ultra Telephoto<\/strong><\/td>22mm<\/td>15\u00b0<\/td>2MP<\/td>F2.0*<\/td>~7g<\/td>Long-distance magnification<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

*Aperture values for non-fisheye models are estimated based on typical M12 lens specs<\/p>\n\n\n\n

All four lenses use the standard M12\u00d70.5 mount, support 1\/2.9\u201d image sensors, feature manual focus adjustment.<\/p>\n\n\n\n

M12 Lens Terminology 101 for reCamera Selection<\/h2>\n\n\n\n

Choosing a lens means reading a spec sheet and understanding what those numbers mean for your project. Here\u2019s what matters.<\/p>\n\n\n\n

Focal Lengthre<\/h3>\n\n\n\n

Focal length is the distance from the lens center to the image sensor, measured in millimeters. It\u2019s the single most important number on a lens because it determines almost everything else about the image.<\/p>\n\n\n\n

A shorter focal length (1.8mm) gives a wider view; a longer focal length (22mm) gives a narrower, more magnified view. These are all fixed focal length \u2014 or prime \u2014 lenses, which means no zoom. If you need different framing, you swap the lens.<\/p>\n\n\n\n

Think of focal length like choosing between a wide doorway and a narrow window.<\/p>\n\n\n\n

Field of View (FOV)<\/h3>\n\n\n\n

Field of view is the angular extent of the scene the lens captures, measured in degrees. There are three ways to quote it, and manufacturers aren\u2019t always consistent:<\/p>\n\n\n\n