Methodology · Thermal scopes

What goes into a HuntGrade score.

HuntGrade brings together published specifications, our own research and calculated comparisons to help you choose a thermal scope. Here’s how we decide what matters and turn those differences into scores.

Our approach

Understand what you’re buying.

We turn deep industry research, scope specifications and retailer pricing into clear visual comparisons, so you can understand the tradeoffs, see what your money buys and choose a scope that fits your hunting.

The starting point

155 thermal scopes.
Confusing specs.

Seven scope cards with varied raw specifications and missing entries.

Different specifications, missing detailsand changing prices leave you to work outwhich differences matter for your huntingand what is worth paying more for.

What HuntGrade adds

Every scope.
Scored the same way.

Scope information passes through consistent scoring into a comparison of identification, field of view and price.

We make specs comparable and score everyscope by the same rules. Modeled thermalviews show the differences, while retailerprices help put their cost in context.

Clear choices

Compare with
confidence.

384+25mm
Close-range hunting
Estimated identification: 228 yd
Field of view: 10.5°
Price: $1,595
384+35mm
More detail, tighter view
Estimated identification: 319 yd
Field of view: 7.5°
Price: $2,699
640+35mm
Sweet spot
Estimated identification: 319 yd
Field of view: 12.6°
Price: $3,699
640+50mm
Longer-distance hunting
Estimated identification: 456 yd
Field of view: 8.8°
Price: $4,499
1280+60mm
Most detail, widest view
Estimated identification: 547 yd
Field of view: 14.6°
Price: $5,995

Compare scopes, see the tradeoffs andunderstand what your money buys. Findthe right balance of performance andprice for the way you hunt.

Understand the weights

A scope’s score starts with the image.

Image performance carries the most weight, followed by handling and warranty. We break each category into the factors below, so you can see how a scope’s strengths and tradeoffs contribute to its HuntGrade score.

Image

Within Image

Sensor resolution: 50%; More sensor pixels preserve finer detail across the scene.
Animal detail: 15%; Distance for identifying an animal.
Field of view: 15%; A wider view shows more ground around the animal.
Sensitivity: 10%; How well small temperature differences can be distinguished.
Optics: 5%; Lens aperture affects how much thermal energy reaches the sensor.
Screen: 5%; Display resolution and refresh rate shape the image you see.

Handling

Within Handling

Mounted weight: 60%; Total scope and mount weight carried on the rifle.
Battery life: 20%; Rated operating time between battery changes or recharges.
Water resistance: 10%; The manufacturer’s published water-resistance rating.
Eye relief: 10%; Distance behind the eyepiece where the full image is visible.

Warranty

Within Warranty

Electronics coverage: 90%; How many years the electronics remain under warranty.
Transferability: 10%; Whether remaining coverage passes to a new owner.

See it add up

See how a scope earns its score.

A scope’s total reflects both the points it earns and the weight each factor carries. Choose a scope to see the breakdown, then select any factor to explore its calculation.

Example scope

Nocpix ACE S60R

Nocpix ACE S60R

1280×1024 sensor · 60 mm lens · 12 µm

ImageImage96.4× 80% weight

HandlingHandling48.7× 15% weight

WarrantyWarranty100.0× 5% weight

HuntGrade Score89.4

Image

96.4 pts

Handling

48.7 pts

Warranty

100.0 pts

Follow the calculation

From specifications to points.

See how each specification earns points and where further improvements earn less credit. Choose a factor to explore the scoring rule and your scope’s result.

Specification

Sensor resolution1280×1024

More sensor pixels preserve detail across the scene, earning the largest share of Image. A 256×192 sensor earns 10 points; 1280×1024 earns 100. Each doubling of total pixels adds the same credit because the benefit covers the whole view. Digital zoom enlarges existing pixels without adding detail.

Sources & methods

Published specs are the starting point.

We research the gaps and put every scope on the same basis, so you can compare them.

Illustrative scopes. Scope A already uses the comparison basis. HuntGrade fills a missing aperture and aligns Scope B’s weight and field of view.
	Published specs			After HuntGrade
	Scope APublished	Scope BPublished		Scope BAfter HuntGrade
Aperture	f/1.0	Missing	becomes	f/1.2Estimated
Mounted weight	24 ozWith mount	22 ozWithout mount	becomes	27 oz+ 5 oz reference mount
Field of view	7.5°	13.1 mWide at 100 m	becomes	7.5°Converted to degrees

A closer look at each spec.

Choose a spec to see how we handle missing details, conflicting claims and different definitions.

NETD

Thermal sensitivity (NETD)

We use published system NETD first, published sensor NETD second, then a researched sensor estimate. Sensor figures stand in for system sensitivity in the score. We do not measure NETD; manufacturers’ test conditions may differ.

Aperture

Lens aperture (f-number)

Unpublished aperture may use a researched estimate, labeled in the specifications. A similar scope alone does not establish the value.

Weight

Mounted weight

We use the scope’s listed weight and account for its mount. Published weights that exclude the mount need an adjustment, so scopes are compared on a mounted basis.

FOV & magnification

Field of view & magnification

We check published figures against scope geometry. Calculated corrections retain the original claim and reason. Apparent FOV is an approximation, not an eyepiece measurement, and is excluded from scoring.

Resolution

Sensor & display resolution

We match the exact scope and generation, keeping sensor, display and recording pixels separate. Digital zoom and larger recordings do not add sensor detail.

Runtime

Battery runtime

Published runtime keeps its battery setup and “up to” qualifications. Cold weather and active features can change how long it lasts.

Water resistance

Water resistance

We retain the published rating. “Waterproof” without a test rating does not establish an immersion depth or duration.

Warranty

Warranty coverage

We check region, covered components, registration and transferability. Thermal electronics coverage and conditional extensions may differ from the headline term.

Identification range

A hunting target. A consistent comparison.

We use the same target size and detail threshold to calculate ID distance for every scope.

1. Set the target

Published ranges often use a human target; we use an adult hog to reflect a hunting scenario.

Human targetCommon industry reference

Our hog referenceTypical 175 lb adult hog

Our target size1.30 m

2. Choose the detail

Identifying an animal takes more pixels than simply detecting a heat signature.

Common DRI thresholds

Detection: 1.5–2 px
Recognition: 6–8 px
Identification: 12–13 px

We count 13 pixels along the hog’s 1.30 m body length, not the total pixels inside its outline.

Our ID threshold13 pixels

3. Calculate ID distance

We combine that target and pixel threshold with each scope’s focal length and pixel pitch.

Our ID distance319 yd

Limitations

What to keep in mind.

Scores, simulations and estimated ID ranges help explain differences between scopes. Field conditions and hands-on experience add context these comparisons can’t capture.

Scores: Consistent rules help compare strengths and tradeoffs using specifications and research. Hands-on reviews add qualities and context the score can’t capture.
Simulations: A shared scene illustrates field of view, detail and zoom. It isn’t scope footage and doesn’t reproduce each maker’s processing or thermal sensitivity.
ID range: The calculated distance is a guide. Weather, animal position and contrast affect identification, so a shared target and pixel threshold cannot guarantee field results.