@Waddizzle wrote:
When I have done that in the past, it was to maintain a higher shutter speed. It works fairly well for shots that show more context than detail, in other words, not a closeup.
More context than detail. I took the picture 2009 with a 7D at ISO 12,800 (ISO H). I had to convert it to black and white because of all the colour noise. Eight years later I still think I would use the same settings because of the context.
@mitchbooth wrote:Hello everyone,
Just returned from the Indoor State Track meet where I took about 1500 photos. As with most indoor venues the lighting was sub par. I met several photographers from MileSplit Ohio who ranged from shooting in sports mode to underexposing every photo by 3 or 4 stops in Raw only to bring up in post production. I was typically at 640 shutter speed and around 3.2-4 on aperature and my iso was set on auto ranging from 2000-10,000. I also used all large Raw files with no JPEG at all.
I'm new in photography and have the Canon 70d, Tamron 24-70 F2.8 and Tamron 70-200 F2.8. I've finally gotten out of auto modes and relatively comfortable with the camera and operating in manual mode. I use Adobe Lightroom for organizing and editing my photos.
I've been trying some night photography and typically leave Long Exposure Noise Reduction off. I have been leaving High ISO Noise Reduction on but have heard by doing so you sacrifice some definition in the photos.
My question to you more experienced photographers is this. Should I shoot indoor events underexposed by 3 or 4 stops and then bring them up in Lightroom or should I use higher ISO for the Canon 70D and let it properly expose them in camera. Which way gets the better result? Is it poor practice to leave the High ISO Noise Reduction off in camera?
Mitch
From a developer at Magic Lantern:
"So ISO 100 for example may be able to capture up to 80,000 photons of light, but since it is rather noisy on Canon cameras, once the photon count drops below 40, there isn't enough light to outweigh the noise produced by the camera. Whereas ISO 1600 for example may only be able to capture up to 5,000 photons, however, it can capture photon counts as low as 4 before the noise produced by the camera is greater then the number of photons captured. These are example numbers, but I'm sure you get the point.
So one thing that should becoming clear is that higher ISOs do not increase noise. In fact, higher ISOs are less noisy. Higher ISOs can capture a smaller number of photons, before that number of photons is less then the noise produced by the camera. Higher ISOs cannot capture the same amount of photons (light) as lower ISOs, but a photographer should only be using higher ISOs when the number of photons (the amount of light) is lower then the maximum for that ISO.
Where the lines get blurred is due to the shot noise. So we have a dark scene, we crank the ISO up, but the image appears to have more noise then an image taken at ISO 100, with the same rendered brightness. That's simply because the light itself that has been captured, contains more noise. Darker scene = less light = less photons = more (shot) noise.
It is very easy to see that higher ISOs have less noise then lower ISOs. Using ETTR principles, take a shot with the camera set to ISO 1600, then without changing any other settings, take another shot at ISO 100. In post processing increase the ISO 100 shot by 4EV and observe the results."
And due to Clarkvision, higher ISO will be less noisy until you hit the camera sensor limited high ISO region:
"However, ETTR is irrelevant in the sensor limited high ISO region in Figure 2. In that high ISO region, one is "light limited" and ETTR is irrelevant. If you need to record a faint signal, once at ISO 1600 to 3200 (as above, but different on each camera), forget the expose to the right idea. Simply set your shutter speed and f/ratio and expose the image, then adjust to the desired level later in post processing. if your camera has auto ISO, one could set shutter speed and f/ratio and set an upper limit to auto ISO of just in the sensor limited region (e.g. ISO 3200 in the Figure 2, 5D Mark II camera), and when the upper limit is reached, fix the image intensity in post processing with no quality loss (assuming 16-bits/channel processing or better).
So too with night and star photography. There is no need to expose to the right in the sensor limited high ISO region. Simply set your exposure time, f/ratio, and the ISO at the optimum for sensor noise limited region with maximum dynamic range. Adjust scene intensity in post processing."
If you shoot ISO between 2000-10,000 I suppose the sensor limited high ISO region of your camera (70D) should be ISO 3200 and that it doesn't really matter if you shoot ISO 6400 under exposed or ISO 10,000. It didn't matter with my 7D (between ISO 3200 and ISO 6400) which I believe has a sensor limited high ISO region above ISO 1600.
Nothing to do with your question, but maybe you also would like to know more about the difference between ISO 640, 800 and 1000. Google: "The riddle of the intermediate ISO setting"
@jrhoffman75 wrote:It appaerntly depends a lot on the particular camera (or rather sensor). See this posting:
http://www.fredmiranda.com/forum/topic/1478377
Maybe those photogrpahers have done the experimenting and reached a conclusion that works for them.
With the new sensor design (M5, 80D, 5DIV and 1Dx II) Canon took a big step forward. But it is still true that ISO 1600 is less noisy than ISO 100 with a M5 with the same shutter speed and the same f-stop in low light. Big difference in real life like the picture in your link? Maybe not.
Two pictures attached from my 7D. The file size from the one with higher ISO has a file size of 3,6 MB. The under exposed one pushed 3 steps has a file size of 3,9 MB due to more noise. Also check the two holes in the cardboard box and compare the noise in them.
Canon M5 with the new sensor design. ISO 1600 vs ISO 100, same f-stop and shutter speed. The one with ISO 1600 has a file size of 3,6 MB, the other one has 4 MB due to more noise.
