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Player One Poseidon M camera showing clustered hot pixels in dark frames

Player One Poseidon-M Pro CMOS Dark Frames Artifacts Help Needed Hot Pixels Troubleshooting
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lunohodov avatar
lunohodov avatar

Hello everybody,

I recently bought a Player One Poseidon M camera (analogous to ZWO’s ASI2600-M Pro). The camera hasn't had its first light yet, because the weather has been bad and the filters haven’t arrived yet. However, I took bias and dark frames (-10°C, Gain 125, offset 10, Low Noise mode) and analyzed those.

While the bias frames look fine, the darks exhibit brighter-than-usual pixels that are clustered together. The clusters appear on dark frames with somewhat longer exposures (> 60 seconds) and are amplified when stacked.

📷 poseidon-m-darks.pngposeidon-m-darks.pngAs you can see in the following image, there are quite a few of these.

📷 masterDark-300s-overview.pngmasterDark-300s-overview.png

My understanding is that these imperfections will be present in other frame types (light, flat, and flat darks) but should be corrected during calibration. Is my thinking correct? Am I missing something?

Should I contact Player One support and request a replacement, or is there nothing to worry about?

I’ve shared the raw and master frames and appreciate your advice.

Clear skies!

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andrea tasselli avatar
andrea tasselli avatar
A sample of four isn't enough to establish correlations but I see nothing abnormal and all these warm pixels will be duly taken care of during pre-processing (e.g. via CosmeticCorrection). Use at least 20 frames for each master dark would be my advice.
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lunohodov avatar
lunohodov avatar

I do take 50 dark and around 100 bias subframes for the masters. Though I uploaded only a subset.

Until now, I’ve only seen individual but not several hot pixels clustered together. Maybe the best I can do now is wait for good weather, then do an end-to-end test.

Thanks again, Andrea!

Clear skies

andrea tasselli avatar
andrea tasselli avatar
The job of dark frame subtraction is to take care of those pesky hot pixels, clustered or not. Drifting and/or dithering will do the rest.
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alpheratz06 avatar
alpheratz06 avatar

This will be handled by calibration. No reason to be alerted at that point.