high iso a7 vs nikon df.

[mastrolittorio]

hello to all.

I'm undecided whether to buy a sony or nikon df a7.

I'm trying to get information as possible before you spend money.

I have a sick mind, and I think one thing, in my opinion, the Sony a7 setting the resolution to 16mp, it behaves like the nikon df at high iso.

someone who owns two cameras or one of them could help me make a comparison at high ISO with this setting? to 16mp.

with pictures if possible.

sorry for my english.

Thank you.

 

[darklamp]

You can do this yourself.

Go to the Sony A7 review and look at the stdio comparison shots. You can select the Df as one of the other cameras.

You can download both JPEGs and RAWs at different ISO settings and resize them or process them as you wish on your own computer.

Personally I'd either decide you want to use a Nikon mount compatible system or a Sony EF mount system and/or prefer the controls and handling of one to the other. These are more fundamental issues.

 

[mastrolittorio]

no, on the review of the files a7 are made in 24 or 36mp.

I was referring to 16mp.

 

[AcquiredTaste]

no, on the review of the files a7 are made in 24 or 36mp.

I was referring to 16mp.

Long and short: the Df wins. It's not a colossal difference but it's definitely there.

 

[MoreorLess]

no, on the review of the files a7 are made in 24 or 36mp.

I was referring to 16mp.

Long and short: the Df wins. It's not a colossal difference but it's definitely there.

--
Any opinions I express are my own and do not represent DPReview. Have a good one and God bless!

Mostly when it comes to Dynamic range at higher ISO's, the Df's shadows are a little cleaner.

 

[Dennis]

hello to all.

I'm undecided whether to buy a sony or nikon df a7.

That's unfortunate. They're vastly different cameras, and choosing between them based on small differences in low light performance is like choosing between two cars based on which has better floor mats. OK, not quite, but it's pretty insignificant when compared to everything else that's different between them.

I have a sick mind, and I think one thing, in my opinion, the Sony a7 setting the resolution to 16mp, it behaves like the nikon df at high iso.

How it behaves (i.e. its signal:noise ration) has nothing to do with what resolution you set it to; that only impacts the visibility of noise when viewed at 100%. If you're talking about setting the resolution to 16MP, you must be planning to shoot jpegs ? (I could be wrong, but I don't think you can shoot raws at reduced resolution). If so, the problem is you're comparing the output of the jpeg engines of two cameras with specific settings, and you might opt to choose different settings (sharpening, contrast, noise reduction) that would influence the visibility of noise. You would also have to consider whether you want to compare two shots at the same ISO, regardless of exposure settings or two shots at the same ISO, regardless of ISO settings (the latter would be more interesting to me). DXOMark tests report that at like (print) sizes, the Df is slightly better (up to 1/2 stop max difference) than the A7. No reason IMO to choose it over the A7 when the cameras are so different in other ways.

I mentioned that the cameras are very different; they also have very different lens lineups, and it's worth considering what lenses you might shoot. If you end up with faster lenses on one system than the other, that could easily outweigh any differences in sensor performance (provided you're willing to shoot wide open).

• Dennis
  --
  Gallery at http://kingofthebeasts.smugmug.com

 

[Erik Magnuson]

no, on the review of the files a7 are made in 24 or 36mp.

I was referring to 16mp.

The A7 doesn't have a 16MP mode; it has 10MP. The A7R has a 15MP mode.

The 10/15MP modes can either be JPEGS downsized in camera or APS-C crops.

 

[mastrolittorio]

erik, so the a7 can shoot only at 10mp? in raw? you made the comparison at high ISO at full resolution?

 

[darklamp]

no, on the review of the files a7 are made in 24 or 36mp.

I was referring to 16mp.

Yes, yes !

The process used by the camera to construct reduced size images is essentially no different from that used by software. Actually the software approach gives you more options.

You can resize them both anyway you please.

In case you're confused about this, note that no matter what size image is recorded on the card, the sensor shoots the image at the same fixed maximum size.

It is always best to shoot at maximum size as it gives you the purest data. Anything else and you are relying on the camera's programmers to guess what you want to prioritize. This is one reason so many enthusiasts and pros shoot RAW - to gain control.

 

[mastrolittorio]

between the two I prefer the a7, for many reasons, the nikon df but I know for sure that is the top at high ISO, and I wanted to see how much difference there was between the two. is an element that I want to put on the scales before you decide.

 

[mastrolittorio]

ok, so if I understand correctly, you confirm me that with any camera setting, the result will always be that of the test in the dpreview review of full resolution?

 

[EinsteinsGhost]

erik, so the a7 can shoot only at 10mp? in raw? you made the comparison at high ISO at full resolution?

IIRC, you can select 10mp resolution in the camera. The a7 also offers crop mode (automatically when APSc lens is used or manually that can be forced) which provides APSc FOV with 10mp resolution (16MP on a7r).

As for high ISO needs, do you really care about ISOs above 3200 or 6400?

 

[darklamp]

ok, so if I understand correctly, you confirm me that with any camera setting, the result will always be that of the test in the dpreview review of full resolution?

I did not say that.

I said the camera always captures the image ( as RAW data ) at pixel size used by the sensor.

Different sized images are created by processing that RAW data. There are a lot of different algorithms to do that.

You are looking for an absolute method to compare two things which cannot be directly compared. Which of the many algorithms used to resize an image and the exact parameters used to control that algorithm will alter the result.

Added to that is the complication of noise reduction processing. Again there are multiple algorithms and how they are applied and with what controls produce different results.

So the absolute comparison you seek is not really possible. You will really be comparing different algorithms, which is a pointless test.

The two cameras will produce very good images. You are obsessing over incredibly minor detail ( literally - you would not notice differences at pixel level in anything but enormous prints viewed at ridiculously close range ).

 

[Erik Magnuson]

erik, so the a7 can shoot only at 10mp? in raw?

The A7 can shoot either 24MP in raw covering the full frame or 10MP in raw as a 1.5x crop of the sensor.

The A7R can shoot either 36MP FF raw or 15MP as 1.5x crop.

 

[Dennis]

between the two I prefer the a7, for many reasons, the nikon df but I know for sure that is the top at high ISO, and I wanted to see how much difference there was between the two. is an element that I want to put on the scales before you decide.

That makes perfect sense Personally, I go by the dxomark measurement charts for raw files. I shoot raw, but even if you don't there are enough controls that I would think it would be difficult to get a good comparison of jpegs. Also, I like comparing measurements at measured ISO rather than nominal ISO, because I tend to shoot at whatever arbitrary ISO is needed to get the shutter speed and aperture I want, rather than shooting with a specific ISO in mind. The dxomark measurements can be displayed for like sized prints (the best way to compare in my opinion) or for "screen" (which is for pixel peepers - you'd expect 36MP to have more noise than 24MP at pixel level, so I'm not sure the point of the comparison .. you had the right idea in asking for downsampled A7 files to match the Df's resolution).

• Dennis
  --
  Gallery at http://kingofthebeasts.smugmug.com

 

[mastrolittorio]

ok, ho pensato che con un sensore 24MP sparando 16mp c'era meno rumore.

the nex 7 (24MP) set to 16mp had less noise, almost identical to the nex 5

e poiché il sensore del marchio Nikon è Sony, ho pensato che il sensore 24MP Sony, impostare 16MP era praticamente lo stesso del df nikon.

sarebbe molto bello, se si sa sony, dirgli di farlo, anche sul RX1.

 

[EthanP99]

The Nikon would win for High ISO, but its not that big of a gap

I was considering buying a Df, but that camera was just TOO BIG.

Now I have A7 and A7R, both are lovely machines to take along everywhere

 

[mastrolittorio]

sony has read this thread. aspect of the sony a7s

a question to those who are more experienced than me. I never do video. but that function that increases DR in the video, also works for the photo?