Anyone who has specified cameras for a lobby with floor-to-ceiling glass knows that lighting, not resolution, usually decides whether footage is usable. The Bosch FLEXIDOME indoor 3100i 5MP (NDI-3703-A) is built for exactly that kind of commercial indoor work, including corporate offices, retail floors, healthcare corridors and school buildings. According to the Bosch Security product catalog, the NDI-3703-A carries Bosch product number F.01U.406.610. Its 1/2.7 inch CMOS sensor records 2592 x 1944 pixels at up to 30 frames per second, which gives operators enough detail for live monitoring and for evidence that holds up later.
The lens is the feature that saves the most time on site. The 3.3 to 10.2 mm motorized varifocal lens lets an integrator set the field of view from a laptop instead of a ladder, so the same camera can cover a wide reception area or a narrow back hallway. Intelligence is built in as well. IVA Pro Buildings runs deep-learning detection of persons and vehicles on the camera itself, so the recording server does not carry that load.
Part numbers matter with this family, and procurement mistakes here are common. The model reviewed is the NDI-3703-A, the version without infrared illumination. The NDI-3703-AL adds built-in IR LEDs. The NDI-3703-A is listed at roughly $499.49 MSRP, though street pricing varies by distributor and region, so confirm it with your supplier before budgeting.
Bosch FLEXIDOME 3100i 5MP Camera Specifications
A spec sheet only helps if you know how each line behaves once the camera is on the ceiling, so here are the core numbers first and then what they mean in practice.
The NDI-3703-A uses a 1/2.7 inch CMOS sensor with a maximum resolution of 5 megapixels (2592 x 1944) at up to 30 fps. The varifocal optics run from 3.3 mm to 10.2 mm with an aperture range of f/1.6 to f/3.29. The horizontal field of view spans 101.4 degrees wide to 30.1 degrees tele, and the vertical field runs from 69.6 degrees down to 21.8 degrees. Dynamic range is handled by 120 dB HDR multi-exposure processing. Video is encoded in H.265, H.264, and MJPEG.
Power arrives over PoE (IEEE 802.3af), and Bosch’s published figure for this model is a draw of 2.4 W to 3.4 W. A single slot takes microSD, microSDHC, and microSDXC cards up to 2 TB for edge recording. Interoperability covers ONVIF Profiles G, M, S, and T, which you can check against the ONVIF profile definitions. The housing measures 137 mm in diameter and 104 mm in height, and the camera weighs 415 grams. The ADI distribution listing also gives the camera an IK08 impact rating and an IP42 ingress rating, which fits an indoor-only product. IP42 offers limited protection against dripping water, which is another reason this is not an outdoor camera.
Those numbers translate into practical benefits. The 5MP sensor gives operators real pixel density, so digital zoom during an investigation still shows usable detail instead of a smear. Thirty frames per second keeps a person walking briskly through a busy entry point from turning into a blurred streak.
The power figure also simplifies planning. A draw this low means a standard 802.3af port is more than enough, and a rack of ordinary PoE switches can carry a surprisingly large camera count without a power budget upgrade. The ONVIF coverage matters just as much. It means the camera will usually connect to a third-party video management system without custom work, although it is wise to test the specific VMS you plan to use. Bosch also lists Bosch Video Management System and Milestone XProtect as supported platforms for this series.
Bosch backs the line with a 5-year warranty and firmware support for up to 4 years after end of life, according to the Bosch product page. For a camera that will sit on a ceiling for a decade, that long support window is a real purchasing argument.
Image Quality, HDR and Adjustable Lens
Image quality in security work comes down to one question. Can you identify the person or object that matters? At 2592 x 1944, the NDI-3703-A resolves clothing patterns, badge details and the items people carry. The distance figures come from the DORI standard (Detect, Observe, Recognize, Identify), and the use-ip.co.uk distributor listing publishes the ranges for this lens. Across the zoom range, a subject can be detected from roughly 138 feet (wide) to 633 feet (tele) and observed at 55.8 to 252.6 feet. Recognition distances run from 29.5 to 128.0 feet, and identification works from about 13 feet at wide to 62 feet at tele.
Read those figures with some caution. DORI numbers are calculated for ideal conditions, and real scenes with glare, crowds and awkward angles will land at the conservative end of each range. Plan identification zones by the shorter number.
Lighting is the more common headache indoors. Glass vestibules, bright entrances and sunlit atriums push ordinary cameras into a bad compromise between blown-out highlights and crushed shadows. The camera’s 120 dB HDR captures several exposures and merges them in real time. A face standing in a backlit doorway stays readable while the darker hallway behind it keeps its detail.
Low-light capability is respectable for a non-IR camera. Distributor data for the series lists light sensitivity of 0.14 lx in color mode and 0.03 lx in black and white mode. That is enough for spaces with dim ambient lighting at night, but it is not a substitute for illumination in a space that goes fully dark.
The motorized lens changes how a team works on site. Horizontal coverage can be tuned anywhere between 101.4 and 30.1 degrees from a browser or configuration tool. Nobody has to hold a lens ring with one hand and a laptop in the other while balanced on a step ladder, and a framing mistake can be corrected after the ceiling is closed.
Even so, a good lens does not fix a bad mounting position. A camera hung too high produces top-down views that capture hair and shoulders instead of faces. Poor-quality fluorescent ballasts and cheap LED fixtures can also cause visible flicker. The electronic shutter can be tuned across a range from 1/15,000 second to 1/25 second, and adjusting it is usually enough to calm the picture under those lights.
Intelligent Video Analytics and Person Detection
Control rooms have a human limit. Operators who watch dozens of feeds miss things, and constant false alarms train them to ignore the alerts that matter. That is the problem IVA Pro Buildings is designed to address. It is a deep-learning analytics package, and Bosch describes it as delivering reliable detection and tracking of persons and vehicles while resisting false triggers.
Older motion detection reacted to anything that changed in the picture, such as a shifting shadow, a light flicker, or air from an HVAC vent. IVA Pro Buildings classifies what it sees instead. It looks for people and vehicles, and ignores most of the scene noise that fills an alarm log with junk. Because the processing happens on the camera, it also reduces bandwidth use. The camera sends metadata and alerts for events such as virtual line crossing, loitering in a defined area, object counting and camera tampering.
The real payoff shows up after an incident. Edge analytics attach metadata to the recorded video, which turns a search through days of footage into a filtered query. An investigator can look for a person entering a storage room after hours instead of scrubbing through overnight video by hand. Anyone who has spent an afternoon watching a hallway at 8x speed will appreciate that difference.
Analytics need good conditions to work well. The camera must have a clear view of the people it is meant to detect, because the algorithms rely on seeing recognizable body shapes. Heavy obstructions, packed corridors, and steep camera angles all reduce accuracy. The built-in pixel counter tool is worth using during commissioning. It confirms that subjects appear large enough in the frame to meet the minimum size the analytics need, and checking this on day one avoids a disappointing result after rollout.
Network Connectivity, Recording and Security
PoE and Network Integration
Cabling is simple. One Cat5e or Cat6 run carries both power and video back to the switch, which keeps installation labor low and avoids a separate power circuit at each camera location.
Bosch’s published power draw for the NDI-3703-A is 2.4 W to 3.4 W, which is modest even for a PoE device. Standard IEEE 802.3af switches can power many of these cameras without a budget upgrade, though you should still total the load across your switch and confirm its overall PoE capacity.
The camera supports ONVIF Profiles G, M, S and T, but support on paper is not always the same as support in practice. Basic streaming and device control normally work across mainstream platforms. Advanced features such as deep-learning metadata search often depend on tighter integration, and a non-Bosch VMS may need a plugin or may expose only part of the analytics. Test the exact combination in a pilot before committing to a full deployment.
Local Storage and Video Compression
Edge recording adds a useful layer of resilience. The camera accepts microSD, microSDHC, and microSDXC cards up to 2 TB, which gives it a local copy of video that exists independently of the server. When a switch fails or a link drops, the camera can keep recording on the card. Once the network returns, that footage can be recovered so the gap in coverage does not stay a gap. Confirm the exact recovery behavior for your VMS and firmware version, because it depends on the recording platform you use.
Cards are not included in the box, and storage use depends on frame rate, compression, and recording schedule. A camera set to continuous recording at full resolution will consume far more capacity than one that records on events.
Three codecs give you control over that trade-off. H.265 (HEVC) is the efficient choice, and it can cut bandwidth and storage needs by up to roughly half compared with older codecs while keeping 5MP detail. H.264 is the compatibility choice for older recorders and legacy network equipment. MJPEG sends each frame as a separate image, which is useful for frame-by-frame analysis but demands much more bandwidth. For most deployments, H.265 is the sensible default and the others are fallbacks for specific constraints.
Built-In Security Features
Every network camera is also a computer on your network, and a poorly secured one is an easy way in. The NDI-3703-A includes a Trusted Platform Module (TPM), a hardware secure element that stores certificates, encryption keys, and credentials. Because those secrets live in dedicated hardware, they are far harder to extract or clone, and another device cannot easily impersonate the camera.
The camera supports certificate-based HTTPS connections and IEEE 802.1X port authentication, which blocks unauthorized devices from connecting to a switch port. Video watermarking helps protect the integrity of footage, which matters when recordings may be used in a legal review. The camera is also listed as NDAA compliant, which is a requirement for many government and regulated customers. Bosch’s catalog additionally lists IEC 62443 and UL CAP cybersecurity documentation for the series, which is the kind of paperwork procurement and IT security teams ask for.
Hardware security does not replace network hygiene. Change the factory default passwords, disable network services you do not use, and keep the firmware current. Bosch’s catalog lists CPP14 firmware version 9.10.0192 for this model at the time of writing, so check the Bosch download page for the latest release before commissioning.
Installation and Camera Placement
Where and how the camera is mounted decides how good the footage will be. The housing uses a click mechanism that snaps on without visible screws, which speeds up installation and gives a cleaner finish in public spaces. The kit includes a TR20 key for the security screw.
Several mounting accessories cover different ceiling and wall conditions. Surface mounting works for standard drywall or concrete. The NDA-3083-PLEN in-ceiling plenum mount keeps a flush profile in drop ceilings and meets plenum requirements. The NDA-U-PMT pendant pipe mount suspends the camera in high-ceiling spaces such as warehouses and open retail floors. The NDA-3083-LWMT L-shaped wall mount holds the camera on a vertical surface for a side-on view.
Think about light paths before choosing a position. A camera aimed straight at a bright fixture will pick up lens flare, and even good HDR cannot fully rescue a scene dominated by a direct glare source. Small changes in angle often make a bigger difference than any setting.
Privacy configuration deserves attention too. You can set up to eight privacy mask zones that block out sensitive areas from both live view and recordings. Typical uses include employee monitors, keypads, and restroom entrances. Setting these up at commissioning protects the organization legally and shows staff that the system was designed with their privacy in mind.
Bosch FLEXIDOME 3100i 5MP vs. the IR Model
The NDI-3703-A has a sister model, the NDI-3703-AL. Mixing them up is an expensive mistake, so the differences are worth stating plainly.
The NDI-3703-A is the standard indoor model, listed at about $499.49 MSRP. It relies on ambient room light and uses a standard IR cut filter. It weighs 415 grams. It suits spaces that stay lit around the clock, such as offices, hospital corridors, and 24-hour stores.
The NDI-3703-AL adds built-in 850 nm IR LEDs with an illumination range of about 30 meters (98 feet), and it can deliver a usable image at 0 lux in active IR mode. It uses a dynamic IR cut filter with automatic switching and manages IR output through smart IR control. It is listed at about $497.41 MSRP, so confirm current pricing with your distributor since street prices move. It also weighs 415 grams. Choose the AL when a space goes completely dark after business hours, and you still need a clear image.
Is the Bosch FLEXIDOME 3100i 5MP Right for Your Security Needs?
The NDI-3703-A is a strong, well-balanced indoor camera. The 5MP sensor delivers real detail, the 120 dB HDR deals with the difficult lighting found in lobbies and entrances, and the motorized lens makes adjustment easy and cheap. IVA Pro Buildings reduces false alarms, which helps operators spend their attention on real events.
It is a good fit for organizations that keep some lighting on overnight and want enterprise-grade cybersecurity. The TPM, the low PoE draw, the broad ONVIF support, and the long warranty make it an easy camera to live with across a large network.
It is not the right tool for every space. If an area goes fully dark after hours, buy the NDI-3703-AL instead. If the camera will face rain or heavy weather, choose a purpose-built outdoor model, since the NDI-3703-A carries an indoor-only IP42 rating. For steadily lit indoor spaces, though, it delivers sharp video, solid security, and dependable long-term service.