yds
Posts: 8
Joined: Sat Dec 14, 2013 2:45 am

Lens degradation??

Tue Apr 17, 2018 1:42 am

I've been using my Picam outdoors, in a sheltered location, without any type of cover over the lens, for the past year or so. Lately, the image has seemed blurry and yellowish. Is it possible the lens has been degraded by UVs? Tried cleaning it with Isopropyl alcohol on a Q-tip, in case it was just dirty, but no difference.

Snapshot attached. Taken during cloudy skys, so it less yellowish, but still blurry.
PorchCam 2018-4-17 07.11.24.379 AM.jpg
PorchCam 2018-4-17 07.11.24.379 AM.jpg (175.76 KiB) Viewed 305 times

jit
Posts: 31
Joined: Fri Apr 18, 2014 2:52 pm

Re: Lens degradation??

Thu Apr 19, 2018 6:16 am

I've recently experienced something similar to this myself. Was wondering if the sensor may have been damaged or maybe the lense out of place causing the focus to be off.

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
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Re: Lens degradation??

Thu Apr 19, 2018 6:19 am

yds wrote:
Tue Apr 17, 2018 1:42 am
I've been using my Picam outdoors, in a sheltered location, without any type of cover over the lens, for the past year or so. Lately, the image has seemed blurry and yellowish. Is it possible the lens has been degraded by UVs? Tried cleaning it with Isopropyl alcohol on a Q-tip, in case it was just dirty, but no difference.

Snapshot attached. Taken during cloudy skys, so it less yellowish, but still blurry.
PorchCam 2018-4-17 07.11.24.379 AM.jpg
Hmm. I don;t know. I'l check in the office to see what might be causing that - to me it does indeed look like some sort of UV degradation, but I wouldn't expect that to happen. It could be condensation INSIDE the casing perhaps?
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yds
Posts: 8
Joined: Sat Dec 14, 2013 2:45 am

Re: Lens degradation??

Thu Apr 19, 2018 11:05 am

jamesh wrote:
Thu Apr 19, 2018 6:19 am
It could be condensation INSIDE the casing perhaps?
The lens if fully exposed to the outside. I don't have it behind any covering or casing. It's placed in a hole drilled in a PVC electrical box.

6by9
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Re: Lens degradation??

Thu Apr 19, 2018 11:37 am

yds wrote:
Thu Apr 19, 2018 11:05 am
jamesh wrote:
Thu Apr 19, 2018 6:19 am
It could be condensation INSIDE the casing perhaps?
The lens if fully exposed to the outside. I don't have it behind any covering or casing. It's placed in a hole drilled in a PVC electrical box.
Inside the casing of the camera module then, behind the lens.
The sensor has no form of IP rating for outdoor use, so i wouldn't be surprised if performance degraded when exposed to the elements.

You could try taking the camera module down, removing the lens, and cleaning inside the module. Only take that approach if you are happy in doing so as you could destroy the module totally.
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