Image Quality

Is there really that much difference in IQ between a 30mp and 40mp sensors?

Not sure I would rank pixel count/density very high in a theroretical IQ test, so I'm going to say no, other things are more important.

Someone who is printing wall size prints or making big crops might think differently.

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eddieb1 wrote in post #18729194
Is there really that much difference in IQ between a 30mp and 40mp sensors?

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It all depends on which aspect of image quality you are asking about:

. . . - Dynamic range?

. . . - Noise grain?
. . . . . . - at low ISO?
. . . . . . - at high ISO?

. . . - Ability to resolve fine detail?

. . . - Color science?

It also depends on which 30MP sensor you are asking about and which 40MP sensor you are asking about.

There's no such thing as "just a general all-around sensor." . There's also no such thing as "all else being equal", because all else is not equal. . Not at all.

Each model of sensor has its own characteristics and will handle different aspects of image quality differently.


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The sensors I was wondering about are the sensors in the Canon 5D mark iv and the Sony A7r iii. I have a chance to trade my canon for the Sony and I’m torn. I reatlike the 5DIV but have read a lot about Sony sensors an how great they are.

eddieb1 wrote in post #18729349
The sensors I was wondering about are the sensors in the Canon 5D mark iv and the Sony A7r iii. I have a chance to trade my canon for the Sony and I’m torn. I reatlike the 5DIV but have read a lot about Sony sensors an how great they are.

1) The Sony 42Mpx sensor is better than the 5D4 sensor to some extent
2) The 12Mpx extra resolution can be quite useful, especially when cropping or downsizing. 12Mpx can pretty substantial.

You will lose the AF capabilities for sports/fast action though that the 5d4 brings to bear over the A73r. If you like a good grip on your camera now, you will lose that too. Go to Best Buy and try out the form factor of the Sony A72 (ours doesn't have the 3 for some reason) and the 5D4.

eddieb1 wrote in post #18729349
The sensors I was wondering about are the sensors in the Canon 5D mark iv and the Sony A7r iii. I have a chance to trade my canon for the Sony and I’m torn. I reatlike the 5DIV but have read a lot about Sony sensors an how great they are.

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There are a crapton of online resources that compare these models for you.

Here is a link to a comparison of the sensor scores of each camera:
https://www.dxomark.co​m …OS-5D-Mark-IV___1236_1106

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The sony sensor is better.... there is no doubt. But I am not sure that overrides if you are comfortable with the ergonomics of the Canon, I'm not sure the difference is enough to make one jump necessarily. Unless you are a pro and have your camera in your hands nearly every day.

Like mentioned before, for both cameras, the final target output size is usually going to be somewhere substantially less than what the image was taken at. That means there will be some level of interpolation in the process. Taking a random number for example... lets say final output is 10 mpx. From a Canon, that means the software will be taking 3 pixels and interpolating that down to one pixel. On the Sony, that will be 4 pixels. A larger sample. Now lets say the image has some noise in it. All things made equal - the Sony image will result in a sharper and more noiseless image before you apply any other tools to it. It is creating that new pixel out of more information than the canon image will have. Therefor the "noise" will be reduced as well. And less detail will be lost.

But we are talking in the extreme here.... and in the vast majority of cases, a good photographer behind either will be able to produce great images.

To the size of the bodies. I shoot my A7III on a Canon 300 2.8 and a 400 2.8. Some say it is too small for big lens setups. And yet, when you use a large lens, you should be balancing with the lens, not the camera body. The additional grip on the Canon is moot. I don't grip my Sonys, because I don't need to, and on a long shoot, less is better. My point here is those statements are usually made by people who haven't really lived with either...

Canons feel great in the hand, they really do. No reason to not like them. I just like the better color depth, and focus that seems to track better on the Sony. I could use either though an be happy. They will both do the job.

For though - the EVF is the thing that keeps me coming back to Sony. Looking forward to seeing what the EOS R can do for me though.... want to try it out.

That DXO had the 7 III in it, not the 7RIII..... the RIII takes it to another level over the older Canon sensor. That said, the canon is still more than capable to produce great images.