IR built-in filter in Scarlet + Epic?

[Patrick Scheller]

Will there be a built-in IR reduction filter (Hot-Mirror)? That would be swell I must say, saves money and preserves image quality.

 

[Pawel Achtel]

IR mirror reflects IR back. How on earth do you expect to improve quality by placing it anywhere except in front of the lens?

 

[Patrick Scheller]

IR mirror reflects IR back. How on earth do you expect to improve quality by placing it anywhere except in front of the lens?

Well according to infos from some professional sites many digital cameras do have this Hot-Mirror filter built-in. Ask them or the manufacturers how the hell they can expect this to work :coolgleamA:

 

[Pawel Achtel]

Which professional sites?

 

[Adam Levins]

Is it not something that can be built into the sensor? I think all cameras have some sort of IR filtering built in but sometime it is not adequate (like in the EX1) and in that case you will need to put a filter in front of the lens.

Correct me if I am wrong.

 

[Jeff Kilgroe]

Most all digital cameras have an IR filter in them. Even the RED One does. However, it's difficult to block enough IR without using a mirror, especially for CMOS imagers that are sensitive to IR.

As Pawel points out, this is not something that can be placed anywhere in the optical path except right up front and there is no practical reason to do such a thing on a lens or a fixed lens camera like Scarlet. Not all situations require additional IR protection and having a mirror permanently fixed to the front of your lens makes it pretty hard to use other filtration options.

 

[Patrick Scheller]

I see so then there IS in fact an IR filter in RED One, okay. I don't see the difference between an IR (-blocking) filter and a so called Hot-Mirror filter. In my understanding they are both eliminating IR ray to pass through like with a UV filter.

 

[Noah Kadner]

Yes there will be an IR cut filter in the camera of some sort as all CMOS and CCD camera typically have one- well we assume this- only RED is sure.

Don't get hung up on the terminology, Patrick. An IR cut filter and a hot mirror IR filter are two different things. An IR cut filter works well within the internal optical path of a camera to help block IR contamination. A hot-mirror works on the outside of the lens to help actually reflect it away- which would not be good behind a lens inside a camera. Read these two links for details:

IR Cut filter:
http://www.optics-online.com/irc.asp

IR Hot Mirror filter:
http://en.wikipedia.org/wiki/Hot_mirror

-Noah

 

[Patrick Scheller]

Thanks Noah, but things are still not that clearly different as you can read here :smash: So the blockers can also use reflection.

... Infrared (IR) cut-off filters are used with color CCD or CMOS imagers to produce color images. An IR cut-off filter blocks the transmission of the infrared while passing the visible. This can be done with two optical techniques: absorption or reflection.

 

[Noah Kadner]

Ok so well what is your point? IR cut filters can go inside cameras or over lenses, IR mirrors go over lenses. It's pretty much as simple as that- why make it otherwise?

-Noah

 

[David Rasberry]

The IR cut filter absorbs IR wavelengths, and doing so it heats up both itself and the sensor. This for instance may be a cause of hot pixels in some heavy ND shots, the kind where you really need to use a hot mirror at the front end.

 

[Patrick Scheller]

My point is that a reflection remains a reflection no matter if the filter is inside or outside - obvious no?

But okay it doesn't matter so much anyways, if there is a filter inside I'm happy.

 

[Gerald Menclik]

My point is that a reflection remains a reflection no matter if the filter is inside or outside - obvious no?

But okay it doesn't matter so much anyways, if there is a filter inside I'm happy.

not really .... I woudn't like the idea of having reflected IR waves going in and out my lens .... :mad5:

 

[Patrick Scheller]

not really .... I woudn't like the idea of having reflected IR waves going in and out my lens .... :mad5:

Ideas can travel everywhere and even be contradictory... light cannot! :chillpill:

 

[Gerald Menclik]

Ideas can travel everywhere and even be contradictory... light cannot! :chillpill:

that you don't see it, doesn't mean it doesn't produce distortions ...... :001_rolleyes: