Canon 7D camera Evaluation high speed noise tutorial sharing

To the photographic enthusiasts to share a detailed analysis of the Canon 7D camera test High speed noise of the tutorial.

Tutorial Sharing:

"High speed noise" refers to the high ISO sensitivity when shooting a variety of noise, it can be measured by the number of high ISO sensitivity of the practicality. How can EOS 7D control these noises and use the "high ISO speed noise reduction function" (NR) to what extent does it reduce noise? The following will be validated under ISO sensitivity.

Test method

The white balance is set to "tungsten" and is filmed only with light from the lamp. The lens uses the EF 50mm f/2.5 small macro. ISO variation brings the difference of exposure to the light coil adjustment, shutter speed fixed in 1/30 seconds to shoot.

Partially enlarged

The selection of the enlarged part has both the dark part which produces the noise easily, and the small text with obvious change in the sharp degree of noise reduction. Check chroma noise, illuminance noise and sharp change.

Points for attention when testing

On the basis of high ISO sensitivity and high pixel fusion, it is not rigid to completely eliminate and strongly deny noise, it is purely visual observation of the availability of photos. The important thing is how to compare the effects of high ISO sensitivity and the risks that will be brought.

Real beat comparison verification

Chroma noise and illuminance noise under high ISO sensitivity

Compare segmented JPEG images taken by changing ISO sensitivity. Any setting until ISO 800 does not see much difference from ISO 100, only the amount of chroma noise is subtracted. Over ISO 1600, all settings under the image are beginning to lose the fresh sharpness, chroma noise increased. The highest ISO 12800 will be nr set as "standard" or "strong", chroma noise is not conspicuous, but the apparent degree of reduction. Using JPEG for high ISO sensitivity shooting is best set to "weak", because it will reduce the intensity of the shot less.

Set to "High ISO speed noise reduction function", the noise reduction process will remove noise, but to note that the stronger the setting, the more easily due to the impact of this treatment resulting in a reduction in the sense of the image.

The evolution from "being able to shoot" to "being able to use" is obvious.

The use of the highest speed, often in order to obtain a high-speed shutter to achieve "can be photographed" purposes, and the impurities and chroma noise caused by the image of low quality is open one eye closed one eye. The EOS 7D has a aps-c specification of about 18 million pixels, with a disadvantage to noise performance, but its high performance so that under the ISO 1600 as long as no pixel-like observation of the basic visual quality gap is not clear.

Although the high ISO sensitivity will be accompanied by a significant chroma noise, but under the ISO 12800 even if the Nr set to "weak" for some of the subject is also within the allowable range. It is particularly worth mentioning that with the changes in ISO speed, will not lose color, there will be no meat to see the level of change. On the other hand, it is not recommended that, in the use of the time, in order to avoid hand jitter or want to gain a large depth of ground, regardless of the use of high ISO sensitivity. If the goal is to take a good photo and want to focus on quality, use a tripod and keep the ISO 400 below. In addition, the JPEG even if the Nr set to "off" will be a bit of noise reduction processing, to completely turn off the noise need to take raw for shooting, and in the image adjustment parameters.

Well, the above information is a small series of photography enthusiasts brought to the detailed Canon 7D camera evaluation of high speed noise of the tutorial to share all the content, you see the photography enthusiasts here, small knitting believe you now that is very clear assessment of the method of it, Then the friends are going to follow the small series of the tutorial on their own to assess the Canon 7D high speed noise bar.