Choosing between HeatSight Optics' C18 (384x288) and C19 (640x512) thermal scope series is one of the most common decisions our customers face. Both lines deliver exceptional thermal performance for hunting and observation, but they differ in resolution, detection range, and price. This guide breaks down exactly what you get with each so you can pick the right scope for your budget and hunting style.
The C18 series uses a 384x288 (110,592 pixel) thermal sensor, while the C19 series steps up to 640x512 (327,680 pixels). That is roughly three times the pixel count. In practical terms, the C19 produces a noticeably sharper and more detailed thermal image. You will see finer definition on animal outlines, better separation between targets at distance, and easier positive identification of game before you take the shot.
That said, the C18's 384 sensor is far from entry-level. At typical hunting distances under 200 yards, it delivers a clear, usable image that is more than adequate for hog, coyote, and predator hunting. Many experienced thermal hunters run a 384 scope as their primary rig and have no complaints.
Higher resolution translates directly to longer detection range. With the same lens size, a 640 sensor can detect and identify targets at significantly greater distances. The C19 640 scopes are ideal if you hunt open terrain, shoot at extended range, or want maximum situational awareness. The C18 384 scopes still offer strong detection performance, especially with the larger 54mm lens option, but the C19 will always have the edge at distance.
| Model | Resolution | Lens | LRF | Price |
|---|---|---|---|---|
| C18-384 35mm LRF | 384x288 | 35mm | Yes | $1,299 |
| C18-384 35mm | 384x288 | 35mm | No | $1,400 |
| C18-384 54mm | 384x288 | 54mm | No | $1,900 |
| C19-640 35mm | 640x512 | 35mm | No | $1,499 |
| C19-640 35mm LRF | 640x512 | 35mm | Yes | $1,599 |
| C19-640 54mm | 640x512 | 54mm | No | $1,699 |
| C19-640 54mm LRF | 640x512 | 54mm | Yes | $1,899 |
| C19-640 75mm | 640x512 | 75mm | No | $1,999 |
Here is what makes this comparison interesting: the C18-384 35mm LRF starts at just $1,299 and includes a built-in laser rangefinder. Meanwhile, the C19-640 35mm starts at $1,499 without LRF. That is only a $200 difference to jump from 384 to 640 resolution, making the C19 35mm one of the best values in thermal optics today.
If budget is tight and you want LRF capability, the C18-384 35mm LRF at $1,299 is hard to beat. If you can stretch to $1,599, the C19-640 35mm LRF gives you the best of both worlds: high resolution plus rangefinding.
Choose the C18 384 if: You hunt primarily at distances under 200 yards, want maximum value, or plan to pair the scope with a separate handheld rangefinder. The C18 is a proven performer for hog and predator hunting in wooded or semi-open terrain.
Choose the C19 640 if: You hunt open fields or plains, need to identify targets at extended range, want the sharpest possible image for shot placement, or plan to keep the scope for years and want the best sensor technology available. The C19 is the future-proof choice.
Both the C18 and C19 are built on the same rugged platform with the same recoil rating, battery system, and mounting options. The only real difference is the sensor. If the $200 jump from C18 to C19 fits your budget, the 640 resolution is worth it every time. But if you are getting your first thermal scope and need to keep costs down, the C18 384 will absolutely get the job done.