The most common method (as I know) to have NDVI is to change the IR blocking filter from the camera for one that let to pass IR and red or another method IR and blue like infra-blue: I suppose that you are new with this, you can have an idea here how it works http://publiclab.org/wiki/near-infrared-camera
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The most common method (as I know) to have NDVI is to change the IR blocking filter from the camera for one that let to pass IR and red or another method IR and blue like infra-blue: I suppose that you are new with this, you can have an idea here how it works http://publiclab.org/wiki/near-infrared-camera
Lens or filter?
Lens, I guess. To be honest, I didn't even think about a filter. Would the quality be the same?
Sincerely I never listen about NDVI lens but perhaps exist. I read about filters to modificate standard cameras, that's what you need?
Either would be fine :)