Calibration Files ToupTek ATR 2600C.
This astro camera utilizes the highly popular Sony IMX571 APC-S sensor. This specific sensor is famous for having zero amp glow, excellent linearity, and a highly stable, clean dark current when cooled.
Because of these characteristics, here is exactly how you should calibrate your camera:
Your Calibration Strategy: Darks, Flats, and Bias
Since your sensor does not suffer from amp glow and handles ultra-short exposures flawlessly, you should use Bias frames instead of Flat-Darks.
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- Dark Frames: Highly Recommended. Even though the IMX571 has incredibly low noise, cooled dark frames will perfectly map out and subtract any hot pixels and remaining thermal noise.
- Flat Frames: Required. Essential for removing vignetting and any dust particles on your sensor window or sensor glass.
- Bias Frames: Recommended over Flat-Darks. Because the IMX571 lacks amp glow and handles ultra-short exposures perfectly, standard bias frames are ideal for calibrating your flat frames.
Recommended Capture Settings
| Frame Type | Exposure Time | Temperature | Gain / Offset | Lens Cap |
|---|---|---|---|---|
| Lights | Target dependent (e.g., 120s – 300s) | Set between -10°C to -20°C | Match your choice (e.g., Gain 100) | OFF |
| Darks | Match Lights exactly | Match Lights exactly | Match Lights exactly | ON |
| Flats | Tweak until histogram is at 30%–50% | Any (Cooling optional but preferred) | Match Lights exactly | OFF (Point at light panel) |
| Bias | Fastest possible (e.g., 1/4000s or 0.0001s) | Any (Cooling optional but preferred) | Match Lights exactly | ON |
Key Optimization Tips
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- Pick a Temperature and Stick to It: The main benefit of your cooled ToupTek is repeatability. Set your cooling to -10°C (safe for both summer and winter) and leave it there.
- Build a Master Library: Because your camera is cooled, your thermal noise profile is perfectly predictable. You can shoot a library of Master Darks and Master Bias frames indoors once, and reuse them for 6 to 12 months without taking them in the field.
Are you planning to build your calibration library using software like N.I.N.A. or SharpCap, or would you like recommendations on optimum Gain and Offset settings for the IMX571 sensor?