If you want to use the viewfinder to compose your framing, which is dependent upon the dedicated PDAF sensor array, then yes, you'll need to do some compensation for using autofocus. Some newer upper tier DSLRs have RGB+IR light meters which would be more accurate with infrared light.Īs far as focusing goes, it depends. Older DSLRs have a single (monochrome) or dual layer light meter located in the area of the pentaprism and viewfinder that is more sensitive to specific wavelengths of visible light. You still will need to expose a little longer than you would for the same light levels if you were shooting visible light only, but it would be nowhere near as long as if there were an IR cut filter in the optical path in addition to the overall lower sensitivity.ĭepending on the exact DSLR you're using, the light meter used when metering while using the viewfinder may or may not be accurate when measuring infrared light only.
![fingerprint capture full spectrum camera fingerprint capture full spectrum camera](https://m.media-amazon.com/images/I/31shKYMsLzL._SL500_.jpg)
The "IR" filter you put on the front of your lens allows IR through and reduces visible light, just as a "green" filter allows green through while reducing red and blue.
![fingerprint capture full spectrum camera fingerprint capture full spectrum camera](https://5.imimg.com/data5/SELLER/Default/2021/8/BC/OE/FK/2823929/1-500x500.jpg)
With that filter removed the sensor will be much more sensitive to IR light. This is because an unconverted camera has a cover glass over the sensor which includes an IR cut filter that rejects most IR light. You won't need to do extremely longer exposures in daylight. Will I face the issues like problem with focusing or the need to do long exposure in daylight and generally all the issues that you face with IR filters used on non-converted cameras? Now that we've got that out of the way, let's see if we can answer your questions: The former and the latter are opposites, even though in common usage we call them the same thing! When we talk about an "IR filter" that we put on the front of our lens so our camera can record infrared light, what we mean is a filter that allows IR light to pass and reduces how much visible light is allowed to pass.That is, it blocks most of the IR light falling on it. When we say the camera has an "IR filter" in the stack of cover glass in front of the sensor, what we mean is that filter cuts IR light.One note: What is meant by "IR filter" depends on the context in which the term is used.