Plant stress filters?

[ANOMOS]

Has anyone seen these?

scroll down to the last picture, it explains the most visually

do you think these would work with mj?
i know that with topping you would see that more
they have camera filters for cheaper as well.

 

[the_dungeon]

wow thats really cool! i have no idea if it will work tho..

 

[ANOMOS]

yeah i just imagine it not working, and being bummed
or maybe you can just get a lens filter that blocks green? i dont know if there is any difference.
they say Nasa developed it, but who knows, they sell beds that way too

 

[ANOMOS]

and i just found this http://mvh.sr.unh.edu/mvhtools/psd_filters.htm

 

[kaljukajakas]

It should definitely work for mj. Don't know how useful it will be and how much advanced warning you will get though. Depends on how perceptive you are and what the problem is I guess. They will probably not work for all problems, just some of them - that is you'd certainly notice a magnesium deficiency but perhaps overwatering would go unnoticed. Anyway, anything the glasses show should also be noticeable to an experienced grower without glasses. They're not X-ray glasses, they just make it easier to notice the problem quickly.

Any filter for green light should work to some extent but depending on it's characteristics the specially designed filters could give a much clearer picture.

Theoretically, you could look at the plant under blue and red LEDs and see the same thing

 

[kaljukajakas]

Using near infrared light to monitor plant health should be a better way. Instead of a green filter pretty much all visible light is filtered out. Since humans can't see near infrared you need a digital camera to check your plants:

http://extnasa.usu.edu/on_target/ot_tutorials_nir.html

 

[DangerP]

I would have two concerns about these stress filter glasses. The first is that those pictures look pretty misleading to me. None of the pictures match up; a serious comparison would have the pictures taken from a tripod or something. The second, which would apply to the IR filter, too, is that they are looking at the plants in sunlight rather than under the kinds of light people use for indoor growing. There already isn't much green light coming out of an HPS bulb, so in theory it would act kinda like these glasses anyway.

Another option that would work is to use a camera with an adjustable histogram or to adjust the histogram later on in photoshop. That way you can just drop the green from the picture and see what the glasses would see. A lot of cameras have this feature already, so you might not need to spend any extra money.

 

[kaljukajakas]

The second, which would apply to the IR filter, too, is that they are looking at the plants in sunlight rather than under the kinds of light people use for indoor growing.

Trust me: any high intensity (HPS, MH) discharge lamp emits plenty of IR an NIR

 

[ANOMOS]

Another option that would work is to use a camera with an adjustable histogram or to adjust the histogram later on in photoshop. That way you can just drop the green from the picture and see what the glasses would see. A lot of cameras have this feature already, so you might not need to spend any extra money.

Thats a good idea, photoshop is worth a try.
i do agree that they are misleading, i just thought it was intresting and random find