P-900 longest exposure - ISO dependent?

PLShutterbug said:

I don’t have the P-900 or would test this myself.

In an astrophotography forum someone replied to a question saying that increasing the ISO value on a P-900 and other P-series cameras decreased the maximum (longest) exposure you can make. ISO 100, meter says 15 seconds, increasing to ISO 200 means that longest exposure available is now 8 seconds.

Sounds like the guy doesn’t know auto-exposure from manual exposure.

If one of you here has a P-900 (or similar), can you definitely answer this? Can you put the camera in manual exposure mode, then modify the ISO value and reply whether changing the ISO also changes the longest exposure you can set?

1. Set camera’s exposure mode to “M”.
2. Set ISO to manual.
3. Set the ISO to its minimum value (100?).
4. What is the longest exposure time you can set?
5. Set the ISO to 3200.
6. What is the longest exposure time you can set?

Thanks. Bonus points if you take a picture of 4 and 6 illustrating the maximum exposure time you can set.

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