How to set the aperture shutter?

I don't know if what the landlord said is really infrared filter shooting. There are two kinds of infrared filters on the market, one is a filter without red low pass, and the other is a filter with red low pass. The real infrared filter shooting should refer to the latter. Its shooting method is completely different from that of ordinary digital cameras:

1. Camera test before photography

Before the official shooting, let's do a simple test to verify whether infrared rays can be shot. Find a TV remote control, press it, and then take a picture of where the remote control sends a signal with the camera. If you hit the luminous point, you will succeed.

2. Customize white balance

Whether using an external filter or modifying the camera internally, it is necessary to customize the white balance. If you use automatic white balance, the photo will be red. When setting, you can find a place with more green to customize the white balance (because green is likely to be equal to white in infrared photography), so that the whole photo looks normal. There may be some color difference in other places, and you can turn it into black and white if you don't like it.

3. Manual mode (M file) must be used when shooting.

Whether you add a filter in front of the camera or modify the camera yourself, these two methods will affect the built-in metering system of the camera. They are completely different from the usual exposure and can no longer rely on cameras to measure light. You need to adjust the exposure combination yourself and choose the appropriate exposure parameters. Therefore, taking infrared photos requires a high grasp of aperture, shutter and ISO, otherwise the exposure will be very difficult.

Concentrate carefully

Sometimes, even if you are sure that you are in focus before shooting, you will find that the photo is out of focus, because infrared photography is generally back-focused. Before shooting, you must move the focus closer, or narrow the aperture to increase the depth of field. If you modify the camera, the focusing system also needs to be carefully adjusted to make full use of the autofocus system.

5. Frames and lighting

Infrared photography is most suitable for shooting in sunny days, because there are a lot of infrared rays in sunlight, the effect will be more obvious, and the effect will be less prominent in cloudy days or rainy days. Generally speaking, the sky and water will darken, and buildings are no different from black-and-white photos, so shooting natural scenery with infrared photography will have a strong visual impact.

Finally, formally answer the landlord's question about aperture shutter: aperture is suggested to be F5.6-F8, ISO 50-200, and the shutter is exposed for 5-30 seconds for a long time. A tripod is necessary. Generally, infrared photography is mainly based on scenery. If you want to shoot people, ISO should be around 400. The shutter should be around 1/8 seconds.