HIKMICRO HM-G620-LENS1 G Series 2X Telephoto Lens HM-G620-LENS1
- CCTV Lens Guide
- Hard Drive Size Guide
Unless selecting a vari-focal camera (with an adjustable lens) It is important to select the correct camera lens option for where the camera is to be positioned. A smaller lens will give you a wider angle but will be "zoomed out more", while a bigger lens will narrow the angle down and "zoom in more". See below to give you some idea on angles of Megapixel HD Cameras:
| Lens in mm | Approx Viewing Angle (degrees) | Ideal Distance (metres) | Typical usage/notes |
|---|---|---|---|
| 2.8 | 106 | <6 | For seeing as much of the immediate area as possible such as above a doorway/low down/garage soffits (edges can appear slightly warped/distorted) - clearly "zoomed out" |
| 3.6/4 | 83-90 | <12 | A great general purpose option giving great coverage still in the corner of a room or higher up on second floor soffits with less distortion - more of a natural "zoom" |
| 6 | 56 | 6-20 | Narrows down the angle and zooms in to look past the immediate area a little to gain more detail - down a driveway for example from higher up |
| 12 | 24 | 20+ | Zooms in significantly more to look at a gate, entrance or adjascent building |
| 16 | 19 | 24+ | As above but more so |
The amount of hard drive space you require is dictated by how many cameras, as well as their resolution, frame rate settings, and whether you have H.265 encoding enabled or not to save space (We advise turning it on to double the capacity shown below with ease).
Finally, you can often make your storage space last a lot longer by enabling motion-detected recording rather than continuous, especially if there are long periods of no activity (to perhaps double or more these figures again).
|
Resolution (Megapixels) |
Days of storage provided by 1TB per camera (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (continuous - full 25 frames per second) |
Days of storage provided by 1TB per 4 cameras (50% motion- 15 frames per second) |
|---|---|---|---|
| 1 | 44 | 11 | 36 |
| 2 | 22 | 5 | 18 |
| 3 | 17 | 4 | 14 |
| 4 | 11 | 3 | 9 |
| 5 | 9 | 2 | 8 |
| 6 | 8 | 2 | 6 |
| 8 (4K) | 5 | 1 | 4 |
| 12 | 4 | 0.5 | 3 |
As a rule of thumb, we recommend 2 Terabytes for a 4 x 4/5MP HD camera setup, as this should give you approx 2 weeks using H.265 @ 20fps and that is on continuous, not motion-detected recording.
(You may only require the full 25 frames per second on certain cameras if things are fast-moving - ie above a till)
You can also use the Hikvision online calculator to work out what works best for you specifically: https://tools.hikvision.com/ca...
(All of our hard drives come fitted and are CCTV-specific from one of the major brands)
The HIKMICRO G Series 2X Telephoto Lens, model HM-G620-LENS1, is designed for use with HIKMICRO G-Series thermal imaging cameras, enhancing long-distance thermal detection capabilities. This interchangeable lens provides a 50 mm focal length with an aperture of F1.3, allowing users to capture clear and precise thermal images from extended ranges.
The lens offers a field of view (FOV) of 12.5° (H) × 10.0° (V) for the G60 model and 9.3° (H) × 7.0° (V) for the G40 model, providing a tighter perspective for detailed target analysis. With an IFOV (spatial resolution) of 0.34 mrad, the lens ensures accurate and sharp thermal images, even at a distance.
The minimum focusing distance is 1.2 meters (1.3 yards), allowing for effective thermal imaging in both close-range and longer-range applications. The lens is designed to operate within a working temperature range of -20°C to 50°C (-4°F to 122°F) and weighs 331 g.
This lens is ideal for professionals requiring precise thermal imaging over longer distances, such as in building inspections, industrial diagnostics, and electrical maintenance.
Please note: This item has a 2-4 week lead time from the time of purchase.
Key Features:
- Focal Length: 50 mm
- Aperture: F1.3
- Field of View (FOV): G60 – 12.5° (H) × 10.0° (V); G40 – 9.3° (H) × 7.0° (V)
- IFOV (Spatial Resolution): 0.34 mrad
- Minimum Focusing Distance: 1.2 m (1.3 yd)
- Working Temperature Range: -20°C to 50°C (-4°F to 122°F)
- Weight: 331 g
- Dimension: 50.7 mm × φ76.6 mm
