The official Sony A99 mk2 thread

MichaelAwkward · 20 Sep 2016 at 20:56

SDK^ said:
Whatever way you want to put it the previous A99 :

Sony SLT light loss : Sony a99 has 33% more noise than Canon 6D, 48% more than Nikon D600 (same release date).

https://www.dxomark.com/Cameras/Com...n-D600-versus-Sony-SLT-Alpha-99___836_834_831

That's because noise isn't just related to light hitting the sensor, but a multitude of other factors. Compare the D600 with the A7 (same sensor) and you'll see that Sony typically perform worse in the ISO score than their equivalents. They always have. With the SLTs, the difference is exacerbated.

DxOMark themselves said at the time that the a99 sensor was the fifth best they'd ever tested, and a fair bit better than the 6D overall.

https://www.dxomark.com/Reviews/Son...y-s-best-yet/Sony-Alpha-99-sensor-performance

DPReview also rated it highly at high ISO.

https://www.dpreview.com/reviews/sony-alpha-slt-a99/13

I use an SLT and the difference between DSLRs I've used in the past is hardly noticeable. It's not even worth talking about unless you're being paid to shoot professionally to produce gigantic prints or only ever shooting in crap light.

Also, you might want to read up on how they calculate the ISO score. You cannot just take the overall score and claim a 33% or 48% difference in noise. It isn't that simple.

robj20 · 21 Sep 2016 at 07:05

MichaelAwkward said:
Nonsense. A mount AF has always been and still is better than E mount. CDAF and OSPDAF is good, but it's still not as good as a dedicated PDAF.

The LA-EA2/4 adapters only affect IQ in so far as they suffer from the same 1/3 of a stop light loss due to the requirements of the 15 point PDAF system.

The adapter has a dedicated PDAF sensor built in, by all accounts its as fast if not faster than the same lens on a A99.

MichaelAwkward · 21 Sep 2016 at 07:47

robj20 said:
The adapter has a dedicated PDAF sensor built in, by all accounts its as fast if not faster than the same lens on a A99.

That's what I said? :confused:

Also, it isn't as fast. The 15 point (3 cross type) system is from 2006. The a99 uses a newer 19 point (11 cross type) plus 102 on sensor point system.

robj20 · 21 Sep 2016 at 08:49

MichaelAwkward said:
That's what I said?

Also, it isn't as fast. The 15 point (3 across type) system is from 2006. The a99 uses a newer 19 point (11 cross type) plus 102 on sensor point system.

So my post was nonsense... But you agree with me.

SDK^ · 21 Sep 2016 at 09:01

MichaelAwkward said:
Also, you might want to read up on how they calculate the ISO score. You cannot just take the overall score and claim a 33% or 48% difference in noise. It isn't that simple.

I did

Like I posted above - the difference is about 33-48% (DXO scale) which equates to roughly 2/3 ISO stop.
Real world camera settings: So ISO 1600 on a DSLR is around ISO 2500 on a Sony A99 - that is quite a noticeable difference I would say.

The question buyers need to ask themselves before they buy an A99 is do they favour focus accuracy/speed over image quality?. If image quality matters more then there are better alternatives out there.

DP Review only shows Noise comparisons for full ISO stops, but this gives you an idea of the difference in image quality between the A99 and a DSLR, taking into account the Sony SLT light loss.

MichaelAwkward · 21 Sep 2016 at 09:30

robj20 said:
So my post was nonsense... But you agree with me.

No, your post was nonsense regarding AF speed on native E mount versus A mount.

I said that the LA-EA2/4 adapters will only affect IQ in so much as the SLT (which is required for their 15 point PDAF systems) will reduce light. You replied saying that they have PDAF systems built in... which is what I said.

MichaelAwkward · 21 Sep 2016 at 09:46

SDK^ said:
Real world camera settings: So ISO 1600 on a DSLR is around ISO 2500 on a Sony A99 - that is quite a noticeable difference I would say.

Again, I don't think you really understand what you're talking about. Where on the SNR graph (I assume you're referring to noise and not sensitivity) does it show that ISO 1600 on the DSLRs is ISO 2500 on the a99?

Also why are you comparing the 5D Mark III at 1600 versus the a99 at 3200? Obviously the 5D Mark III will do better at a lower ISO.

Have you ever used a Sony SLT? Do you intend to buy one in the future? If not, why does any of this matter to you? Why even post in this thread? I mean you said that the face detection system results in a 30% loss of light...