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Frequently asked questions

Lahoux Horus

1Has the Lahoux Horus been optimized as a clip-on, an observation device or lies its strength somewhere between those 2 functions ?
The Lahoux Horus has been optimized as a clip-on for primary optics with a 4-12x magnification range. There is currently no other clip-on available on the market that functions well above 10 times magnification.
2Is there any advantage for a clip-on device in having a resolution of 640×48 above 320×240 ?
The resolution of 320 is deliberately chosen to match practical use as a clip-on device. Using a larger resolution, e.g. 640x480 would result in a lot of pixels being invisible in case an optical device is being used as a clip-on. Those pixels do actually have to be paid for by the customer and do consume power. For the Lahoux HORUS, a larger resolution would simply result in a more expensive device with a shorter battery life, while the range performance stays identical. See the picture below.
3What can you say about the field of view of 9.6 m at hundred meters ?
The field of view is based on practical use cases. The Lahoux HORUS is strongly optimized as clip-on for primary optics with a 4-12x magnification range. For example, a primary optic with magnification 3-12x56 has a field of view of a 3.6° at a commonly used 6x magnification. Other primary optics are not very different concerning field of view.
4What can you say about shutter versus shutterless algorithms ?
The Lahoux HORUS uses an advanced combination of a mechanical shutter and shutterless algorithms. Thus, the Lahoux HORUS has all advantages of either technology. Note that the Lahoux HORUS shutter can be set to automatic, manual and external. The manual setting is recommended for all applications where an interruption of the image is undesired, as mentioned in the manual.
5What can you say about the display technology ?
The Lahoux HORUS has an OLED display. Ccompeting foreign devices with FLCOS displays often have the gamma set very dark thuis obscuring image irregularities. This looks nice, but comes at the expense of mid-level contrast.
6What can you say about the transmission for germanium optics compared to lenses in the visual waveband ?
Transmission of 85% is industry standard for thermal optics. If you take a look at comparabel LWIR objective lenses, you'll find very similar numbers. Thermal objective lenses should not be compared one-to-one with objective lenses for the visual waveband. Such a comparison makes no sense, because very different parameters apply for either waveband.
7Is the objective lens aspheric/spheric ?
The objective lens uses aspheric surfaces, these are located on the inner surfaces.
8What can be said about the amount of pixels that the 12 micron sensor of the Lahoux Horus sensor generates, taking into account the difference between 12 and 17 micron pixel pitch ?
With the Lahoux Horus you can see 4x more pixels at 6x magnification compared with other widely availble thermal clip-on devices with 17 micron sensor. When we use for example primary optics with 3-18x50 magnification, set at 6x magnification, this yields a circular 3,55° field of view with a surface area of 9,9 angular units.

Lahoux HORUS
12µm 320x256 > 81920 Pixel
FOV 5,5° x 4,4° > Oberfläche 24,2
Sichtbarer Bereich bei 6-facher
Vergrößerung: 9,9 / 24,2 = 40,9% = 33513 Pixel

Beispiel für ein weiteres auf dem Markt weit verbreitetes Vorsatzgerät

17µm 400x300 > 120000 Pixel 35mm-Objektiv
FOV 11° x 8,3° > Oberfläche 91,3 Winkeleinheiten
Sichtbarer Bereich bei 6-facher
Vergrößerung: 9,9 / 91,3 = 10,8% = 13012 Pixel

An diesem Beispiel erkennt man, dass bei einer 6-fachen Vergrößerung über die Primäroptik mit dem Lahoux Horus sich im Sichtbereich 4x so viele Pixel befinden als bei dem im Vergleich angegeben Vorsatzgerät. So ist es möglich, selbst bei hohen Vergrößerungen bis 10-fach ein konturengetreues und kaum verpixeltes Bild abzubilden.
9When to adjust the contrast in the menu ?
A high contrast setting should only be used in rain or bad weather, otherwise the device will display vertical stripes in the image. We therefore recommend that under normal conditions of use, the contrast setting in the menu should be reduced to a minimum in order to minimise interference in the picture. Stripes can occur with all thermal imaging cameras on the market, but are sometimes filtered out at the expense of sensitivity. The Lahoux HORUS has been developed with the practical tasks of the hunter in mind and has been optimized for his demands for maximum performance in practice. Therefore, we have deliberately chosen for maximum sensitivity. This is what is really matters in the hunting field.