Pixfra Australia Field Journal · Explainer
Digital day/night scopes and night-vision devices see in the dark by lighting the scene with infrared you can’t see — an IR illuminator, or “IR torch”. The two wavelengths you’ll be offered are 850nm and 940nm, and they behave differently enough that picking the wrong one can cost you either range or stealth. This is the trade-off in plain terms. (Note: this is a night-vision topic — true thermal scopes need no illuminator at all, because they read heat rather than reflected light, as covered in how thermal imaging works.)
Quick verdict
850nm gives you more reach and a brighter image but emits a faint red glow visible up close; 940nm is effectively covert but dimmer and shorter-range. For most night hunting where maximum detection distance matters more than being invisible, 850nm is the practical pick. Choose 940nm only if a completely undetectable beam is the priority and you can accept less range. It matters only for light-based devices like the Volans; thermal scopes don’t use an illuminator.
Why the wavelength matters
Both are infrared, beyond what the human eye normally sees, but they sit at different points on the spectrum. 850nm is closer to visible red, so a little of it leaks into what the eye can perceive — the emitter shows a faint red glow if you look near it. 940nm sits further out, past the edge of human vision, so it’s effectively invisible even at the source. That extra distance from visible light is exactly why 940nm is dimmer to the sensor: the same emitter puts less usable energy on the scene, so images are darker and reach is shorter.
850nm vs 940nm, side by side
| 850nm | 940nm | |
|---|---|---|
| Reach / brightness | Longer, brighter image | Shorter, dimmer image |
| Covertness | Faint red glow at the source | Fully covert, no visible glow |
| Best for | Maximum detection range at night | Stealth where no visible signature is allowed |
| Trade-off | A little visible signature | Less range and a darker picture |
Which should a hunter pick?
For general night hunting — foxes, pigs, rabbits on the farm — reach and image brightness usually win, so 850nm is the sensible default. The faint red glow is only noticeable at fairly close range and rarely spooks game in practice; the extra distance and clarity are worth more on most nights. Reach for 940nm when a visible signature is genuinely a problem — heavily pressured animals that have learned to associate any glow with danger, or situations where you simply don’t want a detectable beam — and accept that you’ll see less far and less brightly. Some shooters keep both and swap by the night.
Where this fits with your scope
This choice only applies to light-based optics. A digital day/night scope like the Volans uses an IR torch to work after dark, and matching the illuminator to your needs makes a real difference to how it performs at night — which feeds directly into the Volans vs day scope + clip-on decision. A true thermal scope (Cetus, Pegasus 2) ignores all of this: it reads emitted heat, needs no illuminator, and can’t be given away by an IR beam. If you’re weighing thermal against day/night, that’s a point in thermal’s favour for pure stealth — and it’s part of which Pixfra thermal is right for you.
See the day/night and thermal range
Volans day/night with IR options, or thermal that needs no torch at all — genuine local stock, GST included, backed by C.R. Kennedy.
Frequently asked questions
Is 850nm or 940nm better for night vision?
850nm gives more reach and a brighter image but shows a faint red glow at the emitter; 940nm is effectively covert but dimmer and shorter-range. For most night hunting, 850nm is the practical pick; choose 940nm when being completely undetectable matters more than distance.
Can animals see an 850nm IR torch?
850nm produces a faint red glow visible to humans up close, and some animals may perceive a hint of it, though it’s far less obvious than a spotlight. In practice it rarely spooks game; if total stealth is essential, 940nm removes the visible red emitter glow to the human eye at the cost of range.
Why is 940nm dimmer than 850nm?
940nm sits further from visible light, so the sensor captures less usable energy from the same emitter. That makes the image darker and the effective range shorter — the price you pay for a effectively covert, glow-free beam.
Do thermal scopes need an IR illuminator?
No. Thermal scopes read emitted heat, not reflected light, so they work in total darkness with no torch and can’t be given away by an IR beam. IR illuminators only matter for light-based devices like digital day/night scopes.
Does the Pixfra Volans use an IR torch?
Yes — the Volans is a digital day/night scope that works with light, so an IR illuminator greatly improves its after-dark image. Choosing 850nm or 940nm depends on whether you prioritise reach or covertness.
One optic, day and night
For one optic that works day and night, Pixfra Draco and Pixfra Volans is the go. Every one is genuine local stock with full Australian warranty, serviced right here through C.R. Kennedy and never sent overseas.
