5D Mark II: Living dangerously with high ISOs
I was shooting in Hermosa Beach this evening, and after the sun set decided to push the ISO speeds on the 5D Mk II to see just how far you could really go and still get good results. My methodology is much the same as Michael Reichmann: I am interested in the specifications, but only concerned about real-world results.
I have learned to expect great quality at ISO 800 on the 5DII. Yes, you can see some small amount of noise compared to ISO 100, but not much. I used to feel the same way about ISO 400 on the original 5D. Of course I always try to shoot at ISO 100, but if there is not enough light, 400 or now 800 is no big deal.
This shot of The Strand (105mm handheld, 1/25 sec. @ f/4) gives an idea of the 5DII’s capabilities - click on the photo to see a slightly larger version. This is my typical low light workflow: capture in Lightroom, straighten and slightly crop, process in Photoshop with Noise Ninja to reduce noise and brighten the shadows (which increases noise somewhat) — except I’m shooting at ISO 6400, whereas on the original 5D or 40D I would be at ISO 1600 or 3200.
To me, this is a very usable image for print or web. There is a bit of noise in the sky (top) and the strand (bottom), but nothing excessive.
The 5DII has two things going for it in the low-light arena: one, that it is actually a stop or two cleaner than the original 5D; two, the image is so much larger than before, so that reducing the image size for actual use further reduces the noise.
The only issue I see is the quality of the chroma noise. There is basically no chroma noise below ISO 800 and small but increasing amounts as you increase the ISO speed. At 6400 it gets to be quite noticeable in the shadows, but Noise Ninja is able to adequately smooth it out.
This shot of people hanging out on the pier was shot at ISO 3200 with no noise processing applied. In the larger image, you can see noise in the sky but it is almost all luminance noise — which to my eye resembles film grain — and much more acceptable than chroma noise. (On Flickr you might be seeing more of their JPEG compression than my camera noise…)
Above ISO 6400, the chroma noise increases and gets larger in size — and is not completely removed by Noise Ninja. Other noise reduction methods might work better, but I have always been happy with Noise Ninja’s results and never felt the need to venture any further.
This shot of apartment stairs was shot at ISO 12800. The walls were brightened but the chroma noise is still visible in the larger version even after Noise Ninja processing. It’s a muddy mess, usable in a pinch but not desirable.
So it’s the chroma noise that makes ISO 12800 and 25600 less than acceptable. I suppose there might be some other software plugin that will take care of these two fastest speeds, but for now I’m considering them off-limits to anything important.
Nonetheless, regular use of the ISO 800-6400 range is opening new possibilities for images that weren’t really practical before. And that’s great!


