Should I always use ISO 100 on a Canon EOS RP for the best image quality?
Asked 7/15/2023
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On older Canon bodies like the 300D and 60D, ISO 100 was clearly better than ISO 200 or 400. With my Canon EOS RP, the difference is much less obvious.
For still photography in good light, if my aperture and focal length are already chosen, I may have flexibility between combinations like 1/100s at ISO 100, 1/200s at ISO 200, or 1/400s at ISO 400. If camera shake and subject movement are unlikely, is ISO 100 still the best choice for maximum image quality, or is there effectively little or no penalty to using ISO 200 or 400 on the RP?
I'm mainly asking whether the RP still gives a real image-quality advantage at base ISO, or whether modern sensors make the difference so small that a modestly faster shutter speed is usually the better tradeoff.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
2y ago
2 Answers
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If you want to get picture with minimum noise (best quality) you should use minimal standard ISO of your camera. Which is 100. For this ISO the signal from sensor is not amplified (to "increase" sensitivity) so you get as I said minimum amount of noise. Some time this also is named base ISO.
You can use these links to compare the high ISO quality. Unfortunately I did not found direct comparison between 60D and RP
https://www.dpreview.com/reviews/canoneos60d/17
https://www.dpreview.com/reviews/canon-eos-rp-review/4
but you can use intermediator (camera which exist on both pages like 5D Mark III)
Originally by user34947. Source · Licensed CC BY-SA 4.0
user34947
2y ago
0
Generated from our catalog & community — verify before relying on it.
For maximum image quality, use the camera’s base ISO, which on the EOS RP is ISO 100. Base ISO generally gives the lowest noise, widest dynamic range, and best overall file quality.
That said, on modern cameras like the RP, the difference between ISO 100 and modest increases such as 200 or 400 is usually much smaller than it was on older bodies. In real use, that means ISO 100 is technically best, but ISO 200 or 400 may show little visible penalty unless you examine shadows closely or need maximum dynamic range.
So the practical rule is:
- If light is sufficient and shutter speed is already safe, use ISO 100.
- If a higher ISO gives you a more reliable shutter speed, it is often the better choice.
A sharp image at a higher ISO is usually preferable to a blurred image at a lower ISO. Modern noise is often manageable in post-processing, while motion blur and camera shake cannot be fixed nearly as easily.
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