A look at the PENTAX K-3 Mark III high ISO and comparison to the full-fame Sony a7 III. │ ガジェット-youtube動画リンクまとめ

【視聴数　21257】

【チャンネル名　Albert Siegel】

【タグ　PENTAX,K-3,K-3 Mark III,K3,K3mark3,K3mkIII,K-3 mk III,a7 III,Sony,Sony Alpha,a 7 III,A7III,A73】

コメント（50件）

EDHblvd より:

4月 29, 2021 7:31 pm

High iso testing in good light during day is useless. You need to test high iso in low light.

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mamolla1 より:

5月 5, 2021 10:27 am

Good job !

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H R より:

5月 10, 2021 2:40 am

Since the A7 III is a 24MP full frame sensor versus a 25MP APS-C sensor this really isn’t a fair comparison. Maybe to a Nikon D7500 or CAnon 90D it might be but not to an A7 III. The Pentax K1 might be a better comparison to the A7 III (although the K1 is 36MP vs 24MP so still not quite an apples-to-apples comparison).

A couple of other things to note: on the Pentax, f/8 on a crop sensor is more like the same as f/13 on a full frame. If you look at the detail in the tall building, by ISO 12,800 all texture (the floors on the building) are lost in the K3 III. Up to about 12,800 both are about the same, with variances in noise, but it seems the A7 III retains a bit more detail throughout up to about 204,800. By 204,800 the building on the side with the Pentax has lost almost all detail (and so has the tree). You have to look at the details and how they are impacted, especially at 204,800. The more detail you can retain the better becuase you will have to blur the image a bit to clean up the noise, so this is where I’d say that attention to details is important when comparing this.

And to be honest at 3:52 You realy should shoot the same subject with both cameras.

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GamingWithStand より:

5月 10, 2021 11:38 am

Try DXO PhotoLab or DXO PureRaw their deep prime is the best noise reduction in the world.

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Adrian M より:

5月 12, 2021 5:53 am

The K3 III is much newer and since Ricoh baked the RAWs further it is expected to perform well and it is performing well. Having said that, I’m looking at my 4K monitor and I have no idea what you are looking at that makes the K3 III images look “cleaner”. No way man. Yes they do look decent at high ISO but the FF does still look cleaner.

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The Hybrid Shooter より:

5月 17, 2021 8:05 pm

3:10 you should not “try to keep the exposure settings more or less the same”. You should use the same shutter speed + aperture and adjust ISO to match Sony exposure (you will have to use higher ISO on Pentax).
Keep in mind that Pentax uses different ISO scale (SOS) than Sony (REI). The difference in actual sensitivity between these scales is about 1 EV, so if the A7 III and K3 III look the same at ISO 6400, it means that Sony is about 1EV cleaner in reality. It is the same thing with Fuji X-T4, which uses the same IMX571 sensor and SOS ISO scale. It also took me some to find out why X-T4 ISO performance seems to be magically good. Unfortunately, both X-T4 and K3 III are far behind A7 III if we account for ISO scale differences.

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Michaelangelo 030 より:

6月 28, 2021 3:30 pm

I never understood all this high iso crap and why they are advertised with this “crazy feature”… who ever uses more than 16-20k iso? atleast to get a picture in some special cases…but numbers like 100 000 or more i mean the image then looks terrible either way

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Utopia Banished より:

7月 13, 2021 1:40 am

Well, since Photons to Photos test the camera, I wish we can turn off the accelerator things they put on its high ISO setting. I will stick with my K3 original. I can de-noise image by myself in post if I want to. I don’t need the camera to do it for me.

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Nightshade Illusions より:

8月 6, 2021 9:55 pm

So many comparisions about ISO. If you have good prime lenses ISO 800 is more than enough for everything. Concerts, shows, football, weddings, etc.

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DRTMaverick より:

8月 18, 2021 11:32 pm

@Albert Siegel, I’ve got a Pentax *ist D and K20D that I’ve been using for the better half of the last decade and a half…. I haven’t upgraded cameras since the K20D.

Is this a worthy camera to upgrade so I can keep with Pentax? What should I consider, since I haven’t had anything between to compare it to?

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