Pixfra Australia Field Journal · How-To
Zeroing a thermal scope trips people up for one reason: you can’t see a normal paper target through it. Thermal reads heat, not ink, so a printed bullseye is invisible. The fix is simple once you know it — you give the sensor something warm (or cold) to aim at — and from there the process is much like any scope, with one very handy shortcut most thermals build in. Here’s the whole thing, start to finish.
Quick verdict
Make a target the thermal can see, then use the one-shot (freeze) zero. Create a heat contrast target — hand warmers, foil, or a warmed metal plate on a cold backer. Fire one careful shot from a solid rest at 100 m. Use the scope’s freeze-zero function: put the reticle on your aim point, then move the floating marker to the bullet hole and save. Confirm with a group. Done in a handful of rounds.
Step 1 — Make a target the thermal can see
You need thermal contrast, not a printed pattern. A few reliable options: stick self-adhesive hand warmers to a cold backing board in a cross or dot; tape a square of aluminium foil to cardboard (foil reflects the sky’s cold and shows up dark against a warmer board); or warm a small metal plate and mount it on a cool background. Even a fresh hand-print on cardboard shows for a while. The aim is a small, clearly defined hot or cold spot you can centre the reticle on precisely.
Step 2 — Set up on a solid rest at 100 m
Zero off a bench, bipod and rear bag, or sandbags — anything that removes you as a variable. One hundred metres is the standard zero distance for most Australian work; use whatever range matches your load and typical shots. Make sure the scope is mounted properly and the rings are torqued to spec before you start, because a loose mount will chase you around the target all day.
Step 3 — Fire one careful shot
Settle in, aim dead centre of your heat target, and break one clean shot. Don’t fire a group yet — a single, well-executed shot is all the one-shot method needs. Note where the reticle was when the shot broke; that’s your reference point.
Step 4 — Use the freeze-zero (one-shot) function
This is the feature that makes thermals easy to zero. In the scope’s zeroing menu, keep the rifle steady and place the reticle exactly where you aimed. Activate freeze: the image holds still so you don’t need a third hand. Now move the floating zero marker off the reticle and onto the actual bullet hole (you’ll see it as a warm or disturbed spot), then save. The scope has just learned the offset between where you aimed and where the bullet went — in one shot. Pixfra scopes run this freeze-zero method through the menu, and the steps are the same across the Cetus and Pegasus 2.
Step 5 — Confirm with a group
Fire a three-shot group at the same point of aim to confirm the correction held. It should now be centred on your target. Make any small final adjustment the same way, and you’re zeroed. If you run a laser rangefinder and ballistic hold (as every Pegasus 2 does), enter your zero range and load details so the holds calculate correctly — that’s what turns a confirmed zero into accurate holds at distance.
A few things that keep a zero honest
Torque your rings and base to spec and check them periodically. Zero with the ammunition you’ll actually hunt with, since different loads print differently. Re-confirm zero if you’ve travelled rough, changed mounts, or the scope’s had a knock. And keep the battery healthy — a scope that dies mid-session is no help, which is why field power is worth planning (see battery life in the field). If you run a clip-on ahead of a day scope rather than a dedicated thermal sight, zeroing works differently again — that’s covered in running a thermal clip-on.
See thermal scopes with easy one-shot zero
Cetus and Pegasus 2 — freeze-zero built in, genuine local stock, GST included, backed by C.R. Kennedy.
Frequently asked questions
How do you zero a thermal scope?
Make a target with thermal contrast (hand warmers, foil or a warmed plate on a cold backer), fire one shot from a solid rest at 100 m, then use the scope’s freeze-zero function: hold the reticle on your aim point, move the floating marker to the bullet hole, and save. Confirm with a group.
Why can’t I see a normal target through a thermal scope?
Because thermal reads heat, not visible ink. A printed paper bullseye has no temperature difference from the paper around it, so it’s invisible. You need a target with a warm or cold spot the sensor can distinguish.
What is one-shot (freeze) zeroing?
A method built into most thermal scopes: you fire a single shot, freeze the image, and move a floating marker from your point of aim to the actual bullet hole. The scope calculates the correction from that one shot, so you don’t burn through ammunition adjusting clicks.
What distance should I zero a thermal at?
100 m is the standard for most Australian hunting, but zero at whatever range best matches your load and typical shots. If your scope has a ballistic hold, enter that zero range and your load data so the holds calculate correctly at other distances.
How many rounds does it take to zero a thermal?
With the one-shot freeze method, very few — one shot to set the correction and a three-shot group to confirm. A rock-solid rest and properly torqued mounts are what keep it to a handful of rounds.
Ready to put thermal on the rifle?
When you are ready to put thermal on the rifle, Pixfra Cetus and Pixfra Taurus are built for the job — Dahua sensor lineage and PIPS image processing. Every one is genuine local stock with full Australian warranty, serviced right here through C.R. Kennedy and never sent overseas.
