Another look at equivalence
Sensor size determines equivalence generically, but I was curious about how specific cameras compare to my new RX100m3, so I did some calculations, based on DxOMark sensor tests. DOF differences are pretty much determined by sensor size, but noise performance and IQ can also vary based on technology and megapixels.
DxOMark gives each camera a low-light ISO score, which they define as "the highest ISO setting for a camera that allows it to achieve an SNR of 30dB while keeping a good dynamic range of 9 EVs and a color depth of 18bits."
Using the formula log2(higher ISO/lower ISO) = stops difference, I calculated the number of stops difference for specific cameras compared to the RX100m3. I then used How Many Stops to determine the approximate apertures that those cameras would require to match the RX100m3's f/1.8 at 24mm and its 2.8 at 70mm. Here are my results:
- Panasonic LX7 - f/1 and f/1.5
- Olympus OM-D E-M1 - f/2.2 and f/3.5
- Pentax K5II - f/2.8 and f/4.4
- Nikon D800 - f/4.3 and f/6.7
Obviously, you can put faster lenses on the Micro Four Thirds, APS-C, and FF camera, but with kit lenses, only the FF camera will do better than the Sony.
Take this for what it's worth, and if you believe that my results are incorrect, or that they don't make sense for some reason, I won't take offense. I had some time on my hands this morning and thought this would be fun to do.
Leave it in the ground!
|Post (hide subjects)||Posted by||When|
|Jul 22, 2014|
|Jul 23, 2014|
|Jul 26, 2014|
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|Jul 25, 2014|
- Canon EOS M58.8%
- Panasonic G85/G803.3%
- Panasonic FZ2500/FZ20001.9%
- Panasonic LX10/LX151.2%
- Panasonic GH5 development3.6%
- Sony a99 II15.9%
- Nikon KeyMission 170 and 801.0%
- Fujifilm GFX 50S development28.3%
- Olympus E-M1 II development18.7%
- Olympus E-PL80.1%
- Olympus 25mm F1.2 Pro1.5%
- Olympus 12-100mm F4 IS Pro1.9%
- Olympus 30mm F3.5 Macro0.1%
- Sigma 85mm F1.4 Art3.6%
- Sigma 12-24mm F4 Art2.6%
- Sigma 500mm F4 DG OS HSM Sport2.4%
- YI M12.2%
- GoPro Hero50.8%
- GoPro Karma drone2.2%
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