Polychrome
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Joined: Wed Feb 24, 2016 8:10 pm

Recommended IR filters for Pi-NoIR

Wed Feb 24, 2016 8:36 pm

Hi!

I've been looking around the forums and I have seen several posts where people have added an IR cut filter to their NoIR camera to make it optionally work as a standard camera.

I would like to get one of those filters for my NoIR and I figured, after all this time some of you must have experience and recommendations for which ones I should get. :)
So if you do, please post about it in this thread! (a store link would be nice, too).

Thanks ahead!

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jbeale
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Re: Recommended IR filters for Pi-NoIR

Fri Feb 26, 2016 5:53 am

If you just want an IR filter to put over the NoIR camera lens, I think this should work: http://www.ebay.com/itm/281437567116

I made this not very thrilling video https://www.youtube.com/watch?v=Z4e0AIpzAxY using a 3rd party "RPi-compatible" camera with M12 type lens mount, and replaced the stock mount with another one that included an IR filter that is switched in and out by a solenoid, and added a 16mm M12 lens. So I have a working day/night RPi camera. Took some effort to assemble.

what I used:
RPi-compatible cam with M12 mount: http://www.ebay.com/itm/291404350105
M12 mount with switched IR filter: http://www.ebay.com/itm/400938137287
M12 lenses (wide-angle types may not work): http://www.m12lenses.com/category-s/64.htm
H-bridge solenoid driver DRV8835: https://www.pololu.com/product/2990
RPi, of course :-)

Note, for the same total cost you can (apparently) get a complete standalone 5 Mpixel IP camera with automatic day/night filter switching.
http://www.ebay.com/itm/like/261441929903

SteveBaker
Posts: 3
Joined: Thu Feb 25, 2016 6:48 pm

Re: Recommended IR filters for Pi-NoIR

Sun Feb 28, 2016 4:35 pm

There is a small blue plastic square that comes with the NoIR camera that is claimed by some people to be an IR cut filter that makes the NoIR camera function like the standard Pi Cam. The trouble is that other people claim that it does something entirely different!

I mentioned this on some forum or other before and someone corrected me, saying that it wasn't an IR cut filter at all - but rather something to cut out certain frequencies of light reflected by the chlorophyll in green plants so that one could do some complicated thing related to assessing plant health using IR light (which would imply that it doesn't filter out IR light at all).

The AdaFruit description of the NoIR camera says "A small piece of blue filter plastic is included, this filter can be used for hyperspectral imaging experimentation!"...um...OK, that's kinda vague.

The Amazon.com description for the camera says:

"A small piece of blue filter plastic is included in case you want to re-add the cut filter, however
it wont look as good as if you had the camera with the original filter in place so it's more
for experimentation!"

So is it an IR cut filter or not? I requested confirmation from Amazon that its is what they claim. The response was:

"I can confirm that that is what the blue plastic does. It not meant to help with green plants, that just
happens because of the properties of light. It's meant to display video and photos the way the naked
eye would perceive it. The quality isn't as good as the actual glass IR filter in the regular pi camera,
but it gets the job done. I hope this answers your question. :)"

So now I'm confused and I don't know what it is. I just got my NoIR camera yesterday and since I don't have a clear answer as to what this filter is - I guess I'll have to test it and see.

<sigh>

Nestboxtech
Posts: 71
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Contact: Website

Re: Recommended IR filters for Pi-NoIR

Sun Feb 28, 2016 7:39 pm

jbeale wrote:If you just want an IR filter to put over the NoIR camera lens, I think this should work: http://www.ebay.com/itm/281437567116

I made this not very thrilling video https://www.youtube.com/watch?v=Z4e0AIpzAxY using a 3rd party "RPi-compatible" camera with M12 type lens mount, and replaced the stock mount with another one that included an IR filter that is switched in and out by a solenoid, and added a 16mm M12 lens. So I have a working day/night RPi camera. Took some effort to assemble.

what I used:
RPi-compatible cam with M12 mount: http://www.ebay.com/itm/291404350105
M12 mount with switched IR filter: http://www.ebay.com/itm/400938137287
M12 lenses (wide-angle types may not work): http://www.m12lenses.com/category-s/64.htm
H-bridge solenoid driver DRV8835: https://www.pololu.com/product/2990
RPi, of course :-)

Note, for the same total cost you can (apparently) get a complete standalone 5 Mpixel IP camera with automatic day/night filter switching.
http://www.ebay.com/itm/like/261441929903
but the ip camera board is nowhere near as fun...
http://nestboxtech.blogspot.co.uk/

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jbeale
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Re: Recommended IR filters for Pi-NoIR

Mon Feb 29, 2016 5:19 pm

SteveBaker wrote: So is it an IR cut filter or not? I requested confirmation from Amazon that its is what they claim. The response was:
"I can confirm that that is what the blue plastic does. It not meant to help with green plants, that just
happens because of the properties of light. It's meant to display video and photos the way the naked
eye would perceive it. The quality isn't as good as the actual glass IR filter in the regular pi camera,
but it gets the job done. I hope this answers your question. :)"
I would suggest you test it and see. All of the "normal" IR Cut filters I have seen, have a clear to slight yellowish appearance. None are deep blue; such a filter would be unlikely to give proper colors in my opinion. Regardless of their visual color, nearly all of the relatively inexpensive "gel" type colored plastic sheet filters used in the lighting industry (as sold by Lee Filters, and Rosco) use dyes that are transparent in the IR. So none of those type of filters would work as an IR-cut filter. However the darker gel filters do function as an IR-pass filter.

jgreen71
Posts: 92
Joined: Wed May 01, 2013 12:29 pm
Location: Clarksville, IN

Re: Recommended IR filters for Pi-NoIR

Mon Feb 29, 2016 5:27 pm

jbeale wrote: However the darker gel filters do function as an IR-pass filter.
This. The little dark blue gel is an IR *pass* filter, blocking the visible light to the sensor.

Peterleroux
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Location: Johannesburg, South Africa

Re: Recommended IR filters for Pi-NoIR

Tue Mar 01, 2016 6:50 am

The blue filter blocks out red and green light, but lets blue (and IR) through. So you end up with the following light on the three channnels of the sensor:
R: IR only
G: IR only
B: IR + blue light
I don't have shots with an IR-block filter, but here are some shots with no filter, the blue filter and a visible-light blocking filter:
Image

fun fact: gels and filters are IR-transparent on purpose: this comes from the old days of film projectors, where film stock had to be highly transparent to IR to prevent heat buildu inside the projector

The end result looks something like this, really not comparable to plain visible light:
Image

rahlquist
Posts: 149
Joined: Tue Jan 21, 2014 1:02 pm

Re: Recommended IR filters for Pi-NoIR

Mon Aug 15, 2016 7:21 pm

jbeale wrote: M12 lenses (wide-angle types may not work): http://www.m12lenses.com/category-s/64.htm
jbeale,

Which M12 lenses have you tried? Are any as good and as wide angle as the OEM? I just ordered the M12 IR Swtiched filter.

Thanks!

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jbeale
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Re: Recommended IR filters for Pi-NoIR

Mon Aug 15, 2016 8:05 pm

I have tried M12 lenses from wide to telephoto, f=2.5 mm up to f=22mm and they all work, some are more blurry than others; none of them are as crisp as the factory-stock lens. Almost all the lenses I have tried are relatively fast (f/1.4 up to f/2.2) and inexpensive (< $12). I am sure you can get better lenses if you're willing to spend more money. Sunex http://www.optics-online.com/dsl_quarter.asp makes a range of M12 lenses which are probably better than what I've used so far.

rahlquist
Posts: 149
Joined: Tue Jan 21, 2014 1:02 pm

Re: Recommended IR filters for Pi-NoIR

Tue Aug 16, 2016 4:40 am

jbeale wrote:I have tried M12 lenses from wide to telephoto, f=2.5 mm up to f=22mm and they all work, some are more blurry than others; none of them are as crisp as the factory-stock lens. Almost all the lenses I have tried are relatively fast (f/1.4 up to f/2.2) and inexpensive (< $12). I am sure you can get better lenses if you're willing to spend more money. Sunex http://www.optics-online.com/dsl_quarter.asp makes a range of M12 lenses which are probably better than what I've used so far.
It's unfortunate that its so hard to find decent glass for these. Its also a testimony to the quality of the camera out of the box. The pi is such a good platform for creating capable cameras. The only other lens I have used is the one that comes with the Arducam for the pi and tbh it sucks compared to a stock lens. If I come across anything that is decent I will be sure to post the information.

cqxiaozhao
Posts: 1
Joined: Mon Aug 22, 2016 3:06 pm

Re: Recommended IR filters for Pi-NoIR

Mon Aug 22, 2016 3:20 pm

It is not necessary for you to buy a IR filter to add,it just can buy a LENS with IR filter,normally there are 650nm 850nm 940nm ir filter. Recently I found a store with so many lenes,I found one for my gopro.also it has good price.

http://www.cctvopticallens.com/Board-Lenses.html

rahlquist
Posts: 149
Joined: Tue Jan 21, 2014 1:02 pm

Re: Recommended IR filters for Pi-NoIR

Mon Aug 29, 2016 8:44 pm

cqxiaozhao wrote:It is not necessary for you to buy a IR filter to add,it just can buy a LENS with IR filter,normally there are 650nm 850nm 940nm ir filter. Recently I found a store with so many lenes,I found one for my gopro.also it has good price.

http://www.cctvopticallens.com/Board-Lenses.html
Thanks for the store tip. I figured since i have the noir may as well get a cutover so i can switch actively turn the filter on and off.

lpt2007
Posts: 7
Joined: Mon Oct 19, 2015 5:39 am

Re: Recommended IR filters for Pi-NoIR

Sat Oct 01, 2016 9:02 am

jbeale wrote:If you just want an IR filter to put over the NoIR camera lens, I think this should work: http://www.ebay.com/itm/281437567116

I made this not very thrilling video https://www.youtube.com/watch?v=Z4e0AIpzAxY using a 3rd party "RPi-compatible" camera with M12 type lens mount, and replaced the stock mount with another one that included an IR filter that is switched in and out by a solenoid, and added a 16mm M12 lens. So I have a working day/night RPi camera. Took some effort to assemble.

what I used:
RPi-compatible cam with M12 mount: http://www.ebay.com/itm/291404350105
M12 mount with switched IR filter: http://www.ebay.com/itm/400938137287
M12 lenses (wide-angle types may not work): http://www.m12lenses.com/category-s/64.htm
H-bridge solenoid driver DRV8835: https://www.pololu.com/product/2990
RPi, of course :-)

Note, for the same total cost you can (apparently) get a complete standalone 5 Mpixel IP camera with automatic day/night filter switching.
http://www.ebay.com/itm/like/261441929903
Can you please add schematics for h-bridge and ir-cut filter connected to rpi gpio?

RasPiNoobiestNoob
Posts: 1
Joined: Wed Jan 18, 2017 7:32 am

Re: Recommended IR filters for Pi-NoIR

Fri Jan 20, 2017 4:24 pm

SteveBaker wrote:There is a small blue plastic square that comes with the NoIR camera that is claimed by some people to be an IR cut filter that makes the NoIR camera function like the standard Pi Cam. The trouble is that other people claim that it does something entirely different!

I mentioned this on some forum or other before and someone corrected me, saying that it wasn't an IR cut filter at all - but rather something to cut out certain frequencies of light reflected by the chlorophyll in green plants so that one could do some complicated thing related to assessing plant health using IR light (which would imply that it doesn't filter out IR light at all).

The AdaFruit description of the NoIR camera says "A small piece of blue filter plastic is included, this filter can be used for hyperspectral imaging experimentation!"...um...OK, that's kinda vague.

The Amazon.com description for the camera says:

"A small piece of blue filter plastic is included in case you want to re-add the cut filter, however
it wont look as good as if you had the camera with the original filter in place so it's more
for experimentation!"

So is it an IR cut filter or not? I requested confirmation from Amazon that its is what they claim. The response was:

"I can confirm that that is what the blue plastic does. It not meant to help with green plants, that just
happens because of the properties of light. It's meant to display video and photos the way the naked
eye would perceive it. The quality isn't as good as the actual glass IR filter in the regular pi camera,
but it gets the job done. I hope this answers your question. :)"

So now I'm confused and I don't know what it is. I just got my NoIR camera yesterday and since I don't have a clear answer as to what this filter is - I guess I'll have to test it and see.

<sigh>
First of all the Raspberry Pi NoIR camera is: Roscolux #2007 Storaro Blue
This is the spectral transmission chart.
http://shop.vls.com/assets/images/ItemI ... ission.jpg


What it's for:
Botanists use infrared photography to work on the health of trees.
https://www.raspberrypi.org/blog/whats- ... oing-here/

I hope this helps.

Nestboxtech
Posts: 71
Joined: Fri Apr 11, 2014 9:45 pm
Contact: Website

Re: Recommended IR filters for Pi-NoIR

Wed Feb 22, 2017 7:56 am

I've used A cheap ir cut module (Google ir cut cctv and you get loads). I had had to Dremel off the lens mount as the fov is so wide on the v2 Pi cam that I got a black halo. Used coupled to an l293d ic to switch it via 5v and and 3 gpios
http://nestboxtech.blogspot.co.uk/

rmartinsjr
Posts: 1
Joined: Tue Jun 26, 2018 2:43 pm

Re: Recommended IR filters for Pi-NoIR

Tue Jun 26, 2018 2:54 pm

I´ve seen many people talking about the blue plastic film that (sometimes) comes with the noir camera module v2 - whether it´s an IR filter. I also had this doubt and decided to test it with a NOIR camera module and a IR LED. The results show definitively that it´s not a IR filter. You may find it useful, if you are a botanist though.

Image

SpatialProf
Posts: 5
Joined: Wed Sep 10, 2014 10:48 am

Re: Recommended IR filters for Pi-NoIR

Fri Jul 20, 2018 12:14 pm

Does anyone know of an available filter for the Pi Camera (or any board camera for that matter) which blocks Blue, but passes Red, Green & NIR... thus creating an RGN camera?

Many thanks.

mamadero
Posts: 2
Joined: Wed Oct 16, 2019 7:13 am

Re: Recommended IR filters for Pi-NoIR

Wed Oct 16, 2019 7:35 am

In case others are curious, the Roscolux #2007 Storaro Blue (aka little blue square that comes with the camera), it actually filters blue. This helps botanists and hobbysts monitor the health of plants. More here: https://www.raspberrypi.org/blog/whats- ... oing-here/

wjburl
Posts: 35
Joined: Fri May 22, 2015 12:08 pm

Re: Recommended IR filters for Pi-NoIR

Wed Oct 16, 2019 5:55 pm

I just got an Arducam Day-Night Vision for Raspberry Pi Camera, Automatic IR-Cut Switching All-Day Image All-Model Support, IR LED for Low Light and Night Vision, M12 Lens Interchangeable, OV5647 5MP 1080P from Amazon. It worked well out of the box and I have it running with MotionEyeOS. It does everything automatically. There are two light sensors, one for the IR cut filter switching and one to turn on the IR illuminators. I would like to have a version of this unit with an 8MP camera, but I can't find one on the market. It's an all in one unit - no assembly required.

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HermannSW
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Location: Eberbach, Germany
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Re: Recommended IR filters for Pi-NoIR

Wed Oct 16, 2019 7:51 pm

wjburl wrote:
Wed Oct 16, 2019 5:55 pm
I just got an Arducam Day-Night Vision for Raspberry Pi Camera, Automatic IR-Cut Switching All-Day Image All-Model Support, IR LED for Low Light and Night Vision, M12 Lens Interchangeable, OV5647 5MP 1080P from Amazon. It worked well out of the box and I have it running with MotionEyeOS. It does everything automatically. There are two light sensors, one for the IR cut filter switching and one to turn on the IR illuminators. I would like to have a version of this unit with an 8MP camera, but I can't find one on the market. It's an all in one unit - no assembly required.
Is it this one? I received from aliexpress, but did not test yet:
https://www.aliexpress.com/item/32971334984.html
Image
⇨https://stamm-wilbrandt.de/en/Raspberry_camera.html

https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://stamm-wilbrandt.de/github_repo_i420toh264
https://github.com/Hermann-SW/fork-raspiraw
https://twitter.com/HermannSW

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Gavinmc42
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Re: Recommended IR filters for Pi-NoIR

Thu Oct 17, 2019 5:07 am

You can also use red filters for plant stuff.
http://www.maxmax.com/endvi.htm
While not as good are "real" filter some results are usable if you use blue or red cellophane.

The normal IR block filter used in the camera is good for day/night cameras especially with IR illumination.
Switch the filter in and out gives you a night or daylight cam.

Some researchers have used the NOIR Pi cams in the UV range too.
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