IR Filter - is this normal??

[Skipper Billy]

Just modded a Lifecam Cinema HD (removed lens and uv/ir filter from the sensor) webcam and fitted it in a Billetparts housing and hooked it up to check I can get focus.

Just popped it onto an ED80 and pointed out through the window.

Bear in mind its a target 2 miles away through triple glazing, semi dark and blowing 85 knots of wind so its a very poor image but it proved I can get focus

BUT

I fitted a Revelation Astro IR cut filter on the end of the Billetparts housing - its a brand new filter and the edges of the image are terribly red - if I remove the filter the whole image is very red (which expected).

Is it a poor quality filter or am I being thick ???

Capture 20_03_2014 18_36_13.bmp

[Kropster]

Can't see why the image should have red edges... unless the ED80 is doing that to the IR and it is blasting through the filter?

[Steve Ward]

Hi Skipper ...

You'll probably get more response if you attach a JPEG or PNG that shows in the post .

I'm sure I'm not alone in the camp of those who do not wish to download unknown files just to view a picture.

[Skipper Billy]

Good point - hadn't thought of that - see if this works.

[Stephen]

Can you show us a picture of the complete housing / assembly / camera / filter?

[Skipper Billy]

Sure - attached.

[Skipper Billy]

PS - the LED in the camera has been disabled - there is no light from within the camera and if I put my hand over the end the image is totally black and no red fringing.

[hobsey]

Would it be because the whole camera insides are designed to have the ir filter closer to the sensors?

Because you look at every filter that has been removed, they pretty much sit on top of the sensor.

I have the same camera but no filter otherwise I would have tried it out for you to see if it done the same.

[Skipper Billy]

Good point - I had imagined that the filter was virtually on the lens in the original camera so it could be smaller and cheaper but you might be right!!

[Psychobilly]

I have moved this thread moved to the Discussion Cameras thread from Discussion Eyepieces... 

Peter...

[Kropster]

Any chance that that hole through which the innards are visible is leaking light?

[Skipper Billy]

@Kropster - I dont think so - if I put my hand over the end where the filter is the image is totally black so there doesn't seem to be any light coming from within.