Two methods for taking infrared photos with a Sony 707 or 717 digital camera

I recently found a post about infrared photography hanging out on the Internet, which is very good:

Link: http://vip.6to23.com/irphoto/index.php/www/content/view/full/56/56.html

Two methods for taking infrared photos with a Sony 707 or 717 digital camera

Because Sony 707 and 717 have strong infrared capabilities, there are two ways. Here is a brief introduction.

Two methods: the overnight shot mode and the normal mode: The normal mode is Sony's own night vision mode. There are two best ways to take an infrared image during the day:

The following figure shows the network type of the task:

The overnight shot mode is Sony's own night vision mode. The best way to take an infrared image during the day is in this mode.

Sony said that the CCD will be damaged in the overnight shot mode over the past few days. That's right. But don't we have an infrared filter, and a set of mirrors. There are three filters :)

If you have been shooting for a long time, you will naturally know that it is appropriate to use it. But if you are a beginner, it doesn't matter. Here is a simple method:

The correct way to use the filter is to first put the deepest IRD, and then place the camera on the nightshot and Automatic Exposure files.

Then you can see your exposure time, if it is between 1/30-1/60. Then you can take a video. If the time is lower than 1/30, it indicates that this filter is relatively deeper than the current situation. Please change it to an IRC. Similarly, you can change it to an IRB. If not, it indicates that the current environment is very dark. This usually happens only when it rains on cloudy days.

Of course, is it possible that IRD is used, there are still many exposures, and the screen is still bright.
This is usually not the case, but in extreme cases, for example, you take a camera and use the night shot mode to photograph the summer sun.

Normal Mode:

The m and S Modes in normal mode are acceptable. In the case of good outside daylight, about 4 "aperture f2.5 is required. You must use a tripod. It is best to use a selfie to prevent vibration. Set the speed to 4 in S mode. Then adjust according to the shooting effect.

In this mode, it is easy to take a picture of the movements and flow of trees in the wind.

Note:

Take an infrared photo, 707/717 required. Turn off the infrared light before the camera.
There is no good way to close the method. You can only use the method of overwriting.

The best way to cover is to choose the disk core and paste it with double-sided tape.

Tips for using the m358x series in sony707 nightshot Mode

The m358x series includes m358, m358a, and m358b. They all feature a variety of infrared filters. How can they be used in sony707 and 717?

First, let's talk about Sony 707 and 717. They have strict requirements on the exposure of the night shot. The exposure area is very narrow and cannot be adjusted manually. They can only be automatically exposed by machines.

In other words:
In the overnight shot mode, the camera is prone to excessive or insufficient exposure. It is easy for a user to prove this point. You only need to check it in the overnight shot mode during the day.

Simply remember the following rules:

Rainy day, cloudy day, with Ira or IRB
Cloudy, sunny, with IRC
Sunday, with IRD

Why? The simple explanation is that the amount of infrared rays from Ira to IRD is different.

For example, the wavelength of IRD is about 950nm. If IRD is used on a cloudy day, it may take a long time to expose the IRD due to insufficient exposure, so that the image quality will not be clear unless you use a tripod. At this time, it is good to use Ira, because IRA of 720nm, IRB can be used as a filter that is critical to visible light and infrared light.

For users with professional requirements, there is another way to consider:

Test one by one from IRD, and press the camera shutter in the lower half of the night shot. If the exposure time remains between 1/30 and 1/60 at this time, the situation is exactly the case.

If it is lower than 1/30, it means that the infrared filter is too deep than the outside world, you need to change the infrared filter, so try your filter until IRB, or IRA.

There is a problem: If IRB still has a exposure time of less than 1/30 ", how can this problem be solved? In this case, the infrared light is very short, so you don't need IRB anymore.

What if the screen is exposed when IRD is used? It should be said that this time is rare, unless you take a camera to take a picture of the midday sun!

Determine whether your digital camera can take infrared photos

Almost all cameras can take infrared photos, but how can you be sure that your camera has the ability to take infrared photos? Here is an effective method.

Generally, almost all digital cameras have the ability to take infrared photos. digital cameras use CCD or CMOS, which have the ability to receive infrared rays. CCD has a higher infrared capacity than CMOS.

Check your DC through the TV remote control

However, under normal circumstances, the digital camera's infrared sensing will produce normal color imaging quality, because there is a filter in front of each digital camera that can block the infrared, this filter is specialized in ICF ). It filters out infrared rays.

To facilitate photography in dim light. 99% of digital cameras do not use 100% of their infrared filters. (In fact, it is impossible to use 100% filters in optics)

Therefore, it can be said that digital cameras in everyone's hands are more or less capable of receiving infrared rays, but they only receive different ranges. But is it possible to receive enough infrared rays. Here is a simple test method.

The home TV remote control is used for testing. The home TV remote control usually emits infrared rays. Generally, when we press a button, the remote control emits an infrared signal, which is invisible to the human eye.

We use a digital camera to align with the TV remote control. We choose a method similar to moonlight or night shooting, turn off the flash, and take the remote control when the button is pressed.

If you can clearly photograph the Glow Points on the remote control. Then your digital camera is capable of shooting infrared rays. You can use it for photography.

Differences between different types of infrared filters

The infrared area is a spectral area starting from 760nm to about 450nm. Therefore, different wavelength infrared filters are different. Here we describe the different characteristics of the infrared filter provided by this website.

It can be said that there are differences between different brands and different models of infrared filters, some are similar, some are the same glass. Some are completely different.

Different models of different infrared filters indicate that the amount of infrared rays that they "pass" is different. This is like the same blood, but there is ABO and other blood.

Similarly, the infrared segments starting from 700nm to about 450nm have different infrared filters that pass through different infrared rays.

In contrast, the differences between infrared wavelengths far exceed the differences between similar models of different brands. (The premise is that all infrared filters are genuine) That is to say, if two different brands have the same or similar characteristics, they are similar or similar in infrared photography.

For example, I have customized infrared filters here.
Ira, IRB, IRC, and IRD are compared by the filter curves, which are the same as those of the following brands.

IRA: equivalent to Hoya r72/Kaya pf4/schtt (B + W) rg715
IRB: equivalent to Hoya ir760
IRC: equivalent to Hoya ir85/schtt (B + W) rg850
IRD: Very similar to Hoya rm90/schtt (B + W) rg1000

For example, if IRC and Hoya ir85 are used for shooting, the shooting effect is the same. The photo cannot be distinguished from the filter.

Experienced players can view the curve comparison between them by themselves
Note: It will be provided later
Comparison between Ira And Hoya r72, Kaya pf4, and schtt (B + W) rg715 Curves
Comparison between IRB and Hoya ir76 Curves
Comparison between IRC and Hoya ir85 and schtt (B + W) rg850 Curves
Comparison between IRD and Hoya rm90 and schtt (B + W) rg1000 Curves

How does a digital camera use a filter and select a adapter?

To add a filter in front of a digital camera, you must first confirm that your digital camera can have a place to install a filter, which is usually divided into three situations.

A. The camera itself does not have a place to install filters, and auxiliary accessories cannot be installed.
B. The camera does not have a filter installed, but you can configure the filter by adding an adapter.
C. The camera itself has a threaded port configured with a filter.

There is no way for a. Your camera to configure a filter. unless you are willing to put the filter in front of the camera, there is no way to use the filter.
B and C are similar. Whether or not you purchase an adapter, these cameras have the ability to install filters. The following two situations are described,
As for what specific models of cameras can be installed, what models can not be installed, please refer to the commonly used digital camera filter caliber table attached.

Several Concepts of wearing filters:
1) aperture, a key size of the filter is the aperture of the filter. That is to say, the aperture of the lens is usually different for different digital cameras. Generally, the aperture is expressed in millimeters. For example, the nikon990 and Sony 28mm have 707 calibers.
2) threads are generally. 75, and a very small number of lenses are. 5. Generally, you do not need to consider it.
3) when the lens and the filter size do not match, you need to add a circle to the filter and the lens. Generally, two parameters are used. The first parameter indicates the lens, and the second parameter indicates the filter. For example, 55-58 indicates that the lens is a 55mm adapter to the 58mm filter. The adapter ring has a variety of sizes, which will be described later.

Select a filter that fits your lens diameter:
In general, the following principles apply to filters:
L it is best to use a filter with the same caliber as your own lens. For example, a 52mm lens will wear a 52mm filter.
L it is best not to add too many filters. One or two filters are enough. The reason is that, first, the image field of view is possible, and the other is that each filter has a certain amount of light loss.
L when there are more than two cameras or lenses with filters, it is best to configure the filter according to the size of the largest lens, so that the small size of the lens can share a filter through the adapter. Save money.
L The UV filter is often used as a protective lens installed in front of expensive cameras and lenses to protect the lens surface from harm. Although UV simultaneously reduces the UV to improve the image quality.