Talk:Sony Alpha 99

DxO Mark

It is important to keep always in mind that DxO Mark uses there own developed RAW-Converter for every Camera test with there own default Settings of this RAW-Converter. This causes that the a99 gets one of the lowest scores in terms of sharpness tested with a large range of lenses. Often used as Reference, DxO Mark does not tell if one Sensor is better than an other.

For example DxO Mark shows that the a77 have only marginal/non-visible more noise than the Canon EOS 60D where in fact the Noise is more than 1EV higher on the A77 (very good visible, especially on high-iso).

The Noise of the 60D at 12'800 is even less than the Noise of the a77 at ISO 6400 (so the 60D have >=1EV less noise), but still DxO Mark tells the Noise of the a77 is maximum 0,5 EV more.

Its sad that ""reviews"" from DxO even got there way into Wikipedia, if you read through there description how they test its obvious that those results are not usable.

DxO says the Dynamic of the D800 at ISO 100 is 14,4EV where in fact the noise-free Dynamic stops at 9,3 EV and the total dynamic stops at 13,3 (13,3 EV have a very lot of noise, comparable to ISO 25'600)

Also DxO says the Canon 5D Mark III have an dynamic of 11,7 EV at ISO 100 where the noise-free Dynamic stops at 7,87 EV and the total dynamic at 12,5 EV

So in terms of DxO, D800 have 2,7 EV more Dynamic Range than the 5D Mark III where in fact the difference is only 0,8 EV

Also nobody was ever able, until today, to reproduce the results DxO had. Nobody ever got 14,4 EV from his D800 (just download an Sample RAW and try yourself ;)), nor does anybody have an a77 with about the same noise level than the 60D

DxO Results are completely out-of reality and have nothing to do with the actual performance of the Sensor. The same is for A99

DxO tells A99 have 14EV Dynamic Range.

The noise-free Dynamic of the a99 stops at 9,7 EV and the total Dynamic is 12,8

I own a a99 myself and i can proof that it is completely impossible to get 14EV of dynamic out of this camera. Its even hard to get 11 EV out of this Camera, 12,8 EV look like a ISO 25'600 shot and is _not_ usable. I also owned the D800 and its even more impossible to get 14,4EV (especially if you shoot higher than ISO 100)

DxO Mark tells nothing, helps nothing, is not usable to compare cameras. It should _not_ be used as an reference here as it is _not_ an reference to anything that have to do with the Camera.

The only thing that DxO Mark can tell with there values is what there "analyses" software thinks it can get out of there own processed RAW-Files, nothing more, nothing less.

I will remove this reference as its completely useless.

All the values i wrote above have been proofed by IMA-Test, the leading industry solution for measuring Sensor performances.

47.65.231.131 (talk) 21:31, 25 October 2013 (UTC)

This article is missing key information about this camera, and mischaracterizes it.

The main advance of the Sony A99 is that it is a digital SLT (Single Lens Transluscent) camera and not a DSLR. That's not explained in this article.

Unlike a SLR design the mirror in the Sony camera does not move, it is fixed. It is also translucent. Some percent of the light goes through the mirror directly to the image sensor, from which the EVF is fed. The other percent is reflected upward in the manner of a SLR, but to a different destination, not to an optical viewfinder, but to the phase-detect autofocus mechanism.

Now that phase-detect auto-focus is being routinely done on the sensor the added complexity of the A99 doesn't seem to provide any real benefit. Which may be why Sony seems to have shifted development to the simpler mirrorless design of the A9 / A7.

It would be good to update this article. There is a wikipedia article on Sony SLT that can be refrenced.

I'm not an expert on this, so I'm hoping someone else can write it up. ZeroXero (talk) 18:05, 4 February 2019 (UTC)