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Info on Echo Blemishes / Spots

This is probably the question we get asked the most: If Echos are run-offs of the Photonis INTENS 4G line due to factory dark spots (aka blemishes), how many dark spots should I expect and how bad are they?  Let's call a spade a spade right off the bat and be honest - Echos are higher-performing and more affordable than any other comparable image intensifier tube available, but yes, they have factory dark spots in the form of small dots in the image. Second - while Echos initially were 4G run-offs, this is no longer the case and Photonis is now making these to fill the product line. Third - factory dark spots and blemishes are two different things. Factory...

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