[ARCHIVED THREAD] - Fixed Pattern Noise

Posted: 4/28/2012 1:12:04 PM EDT

Is it normal to see fixed pattern noise (hexagonal patterning) in Gen 3 tubes in high light situations? I was using an ITT PVS-14 in doors and noticed the hexagonal pattern pretty clearly when I lit up a nearby wall with a Surefire M1. The image through the tube is crystal clear under normal low light or outdoor use with illuminator. Is this normal?

Posted: 4/28/2012 1:19:14 PM EDT

[#1]

Fixed-Pattern Noise (FPN)

A faint hexagonal (honeycomb) pattern throughout the image area that most often occurs under high-light conditions. This pattern is inherent in the structure of the microchannel plate and can be seen in virtually all Gen 2 and Gen 3 systems if the light level is high enough.

Source:http://www.morovision.com/terminology.htm

Posted: 4/28/2012 4:30:25 PM EDT

[#2]

Yes, it's normal. It's also a very good indicator that the situation is too bright for your monocular - so where practical avoid use extended under such conditions.

It probably won't damage it, but it will decrease it's usable lifetime.

Regards

David

Posted: 4/29/2012 12:57:34 PM EDT

[#3]

When it is too bright like that you need to put the rubber cap over the objective lens and use the tiny peephole....

[ARCHIVED THREAD] - Fixed Pattern Noise

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[ARCHIVED THREAD] - Fixed Pattern Noise

[ARCHIVED THREAD] - Fixed Pattern Noise