# What is the sensor.set\_auto\_exposure maxium value？

**URL:** <https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700>\
**Category:** OpenMV Boards\
**Created:** [August 30, 2023, 12:45pm UTC](https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700 "2023-08-30T12:45:22Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![sjh2100](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/sjh2100/32/2979_2.png) [@sjh2100](https://forums.openmv.io/u/sjh2100)\
**Post date:** [August 30, 2023, 12:45pm UTC](https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700/1 "2023-08-30T12:45:22Z")

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1）what is the sensor.set\_auto\_exposure maxium value？  
2） How long does openmv4 h7 plus last normally？ i means it works normally continuous。several hours or several days？

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**Author:** ![kwagyeman](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/kwagyeman/32/4_2.png) [@kwagyeman](https://forums.openmv.io/u/kwagyeman)\
**Post date:** [August 30, 2023, 3:55pm UTC](https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700/2 "2023-08-30T15:55:25Z")

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1. Never measured it. Technically, if you want to modify the PLLs on chip one user for it into the 10 second range. Google OpenMV Cam star tracker.

2. Unless there’s a bug in the code the system shouldn’t stop working.

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**Author:** ![oramafanis](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/oramafanis/32/1783_2.png) [@oramafanis](https://forums.openmv.io/u/oramafanis)\
**Post date:** [August 30, 2023, 4:22pm UTC](https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700/3 "2023-08-30T16:22:26Z")

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Please share this project… It sounds interested.  
Star tracking with openmv will be insane…

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**Author:** ![kwagyeman](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/kwagyeman/32/4_2.png) [@kwagyeman](https://forums.openmv.io/u/kwagyeman)\
**Post date:** [August 30, 2023, 8:01pm UTC](https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700/4 "2023-08-30T20:01:00Z")

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> **[GitHub - frank26080115/OpenMV-Astrophotography-Gear: using OpenMV to assist...](https://github.com/frank26080115/OpenMV-Astrophotography-Gear)**
>
> using OpenMV to assist in astrophotography. Contribute to frank26080115/OpenMV-Astrophotography-Gear development by creating an account on GitHub.

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<div class="post-metadata">

**Author:** ![sjh2100](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/sjh2100/32/2979_2.png) [@sjh2100](https://forums.openmv.io/u/sjh2100)\
**Post date:** [August 30, 2023, 11:24pm UTC](https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700/6 "2023-08-30T23:24:16Z")

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thank you 。i wonder if the ISO of openmv5 camera could be adjust in future.  
for the second question ,i worry about the quantity of heat during camera works，  
i heard that the heat of camera is very large, i worry the Heat has a negative impact on the camera when it works for a long time. so i want to know that accurate time value。

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**Author:** ![kwagyeman](https://yyz1.discourse-cdn.com/flex029/user_avatar/forums.openmv.io/kwagyeman/32/4_2.png) [@kwagyeman](https://forums.openmv.io/u/kwagyeman)\
**Post date:** [August 31, 2023, 4:53am UTC](https://forums.openmv.io/t/what-is-the-sensor-set-auto-exposure-maxium-value/8700/7 "2023-08-31T04:53:14Z")

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Yeah, long exposures have a ton of shot noise. Heat affects this.