What strategy would you use for the R5, if you wouldn't mind? Links below:
Should Nikon Z9 shooters avoid ISO 400?
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What strategy would you use for the R5, if you wouldn't mind? Links below:
Here is some worthwhile background reading.
photographylife.com
ISO Invariance Explained
In this article, we will explore ISO invariance in detail and how you can use it to your advantage in your photography
photographylife.com
Wrogu
Active member
+This. On my a9 I usually stick to ISO 640 which is the first after in the second gain. It is better than 300-500 ISO. And ISO 640 equalls to 2-3 times faster shutter (1-1,5EV) which gives a peace of mind in terms of sharpness.
I find the R5 charts difficult to interpret. The camera uses noise reduction at low ISOs. Normally, the SNR at low ISOs is good enough that noise reduction is not needed. I don't know what algorithm Canon is using, but NR usually imposes some degradation of sharpness. However, Topaz Denoise often works well in reducing noise while maintaining sharpness.
Comparison of PDR Shadow improvement results for the R5 and Z9 are interesting
At lower ISOs, the R5 uses NR as indicated by the triangle down markers. At ISO 318 shadow improvement is negative at about 2/3 EV, which is not what we want. At ISO 400 with the R5 we get 2/3 EV improvement, but this value is confounded by the NR. At ISOs 800 and above and without NR there is about 1/3 EV of improvement, and this remains constant throughout higher ISOs and the curve is ISO invariant thereafter. At ISOs above 800 you can get highlight protection with manual exposure by using the previously discussed strategy proposed by Jim Kasson for the D850.
With the Z9, Kasson's strategy is straight forward to implement.
I hope this helps and would be interested in how others view this exercise.
Bill
So to paraphrase Jim but for R5. Set aperture for dof and shutter speed for motion. If iso falls 100, 200, 300 use 100, if 400 use 400, if 800 or above use 800. Sound right?
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From the DPReview of the Canon R5:
Canon EOS R5 review: Digital Photography Review (dpreview.com)
"When using the fully mechanical or electronic first-curtain shutters, the R5's performance is quite good. It's also the first Canon sensor we've encountered that uses a dual-gain design that kicks in at ISO 400, which helps explain that the ISO 400 and ISO 6400 shots are essentially the same.
Why does this matter? Because it tells us how well-designed the sensor is, and this performance can then be exploited. For instance, in low light situations, you can use the shutter speed and aperture settings of a high ISO exposure, but keep the camera set to ISO 400. By the time you brighten up the shot in post, the image won't be noticeably noisier than if you shot natively at a higher ISO, but you've saved several stops of highlight information. This is great for keeping, say, neon lights from clipping to white in a street photo at night."
This clears up matters on the use of ISO invariance for highlight protection. They do not mention the use of noise reduction at ISOs begining at 400 through 636 and lack of NR at ISO 800 and above. Jim Kasson recommends no more than 3 EV brightening in post.
Bill