HIGH ISO COMPARISON: ** Z6 vs. Z7 ** (4,000 - 25,600) Real-World Setting

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HIGH ISO COMPARISON: ** Z6 vs. Z7 ** (4,000 - 25,600) Real-World Setting
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So at the request of a few, I did an informal comparison of the Z6 and Z7, at high-ISOs, in the real-world settings I see every day. (If not every day, several times a week).

The Subject is an Oak Tree:

Oak Tree (Areas 1, 2, and 3)

The area indicated by the red box is where I focused, and the three areas I am looking at expand outwards as follows:

  1. Focused Areas (clarity, color, noise-in-shadows);
  2. Immediate Surrounding Areas (clarity, color, noise-in-shadows)
  3. Background Areas (smoothness, lack of noise).

I used the 800 FL ED + 1.25x TC (1000mm) + FTZ, alternately-placed on the Z6 & Z7, all mounted on RRS Tripod Legs + Wimberley Gimbal Head.

*** PLEASE WATCH FULL-SIZED @ 4K RESOLUTION ...

PART I:

Here is a video describing the full protocol:

Again, this video was taken @ FULL-SIZE, zero adjustments. Compare the color, detail, and noise as we progressively-increase ISOs ...

PART II:

Moving on from full-sized images, another claim is that "if you resize the Z7 images down to Z6 dimensions," then everything becomes equal.

Let's see if that's true 😃

Based upon this test, it is quite understandable why many folks claim down-sampling Z7 images "equalizes" everything to Z6 Quality. However, while I do see the improvement, I don't think this is entirely true. And Bill Claff's graphs also show the Z6's superiority, down-sampled to DX:

Z6 Superior to Z7, down-sampled to DX, OVER ISO 640

Link

Finally, there is the question as to which files post-process better? Remember, there are 3 Steps:

  1. Original File Size
  2. Down-sampled =
  3. Re-Sampled, Fully-Processed to Usability (4K)

As the saying goes, "A Picture's Worth A Thousand Words"; well, a video is thousands of frames per minute. Watch the conclusion, and you can be the judge:

PART III:

This video compares the fully-processed images, all prepared the same in Lightroom, all receiving the same treatment (Action) in Photoshop:

This will conclude my review, based on my intimate (multi-year, tens-of-thousands of images) "opinion and conclusion" on this subject.

Many people say, "I have no dog in this fight."
Me? All my dogs are in this fight, I own both 😄

I own, enjoy, love, and utilize all these cameras daily ... but I know which cameras are superior, under which contexts. It's not a mystery, the information is already out there.
So, if anyone tells you that "the Z7 is = to the Z6 @ high-ISOs, 'down-sampled,' " you can confidently tell them that they are mistaken.

You may download all files here.

Cheers, and thanks for reading and viewing ...

Jack

-- hide signature --

Please forgive: I use voice text, so there may be typos. Hopefully it still makes sense
~
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