julienA

Lives in United States United States
Joined on Jul 26, 2006

Comments

Total: 18, showing: 1 – 18
On article SLT strikes back: Sony a99 II real-world sample gallery (272 comments in total)
In reply to:

J A C S: Sony greens...

@J A C S: I'm not too surprised that threads where you explain your "theories" reach 150 posts. Actually that's quite logical, there's quite a lot of stuff to correct in your statements.

Link | Posted on Jan 13, 2017 at 06:31 UTC
In reply to:

FLruckas: I'd like to see DXO scores for Blackmagic cameras, Canon C series, and for video from cameras that are reviewed here.

DxOmark is not intended at evaluating video quality. If anything, the Dxomark of a HD or 4K image with DR crammed into 8bit for compression will be very low.

Link | Posted on Jan 11, 2017 at 20:22 UTC
On article SLT strikes back: Sony a99 II real-world sample gallery (272 comments in total)
In reply to:

J A C S: Sony greens...

@J A C S: if, instead of lecturing people, you started to really investigate that topic that you pretend to know, you'd quickly find out that color matrices encapsulate enough of the spectral sensitivities for the rest to be irrelevant to photographers.

Link | Posted on Jan 11, 2017 at 06:56 UTC
On article SLT strikes back: Sony a99 II real-world sample gallery (272 comments in total)
In reply to:

J A C S: Sony greens...

@J A C S: I do not refer to the DxO score, but to the full color matrix available in the "color response" tab of the dxomark data. And contrary to what you say, this data is available for all the sensors that they have tested. It's just not there when you're in "compare" mode - you have to look it up in single sensor viewing mode.

And this data says that recent Canon and Sony sensors have basically the same raw color response. JPEG images differ but this is the jpeg engine and no one forces you to use it.

Your cultural horizon about Dxo seems to end at the dxomark score. This is weird for someone who pretends to know them and interact with them.

Link | Posted on Jan 10, 2017 at 20:15 UTC
On article SLT strikes back: Sony a99 II real-world sample gallery (272 comments in total)
In reply to:

J A C S: Sony greens...

Look, we'll leave it be if you want to believe that your canon would have done better. We support peace in the world.

But like I told you in another thread, a canon 5DIV sensor and the A99II/A7R2 sensor have almost exactly the same raw color response (source is DxO sensor color tab).

I'd say the more worrying thing about this Sony is the A-mount. Not much glass fully supporting the body capabilities, and not much glass looking to be released.

Link | Posted on Jan 9, 2017 at 19:29 UTC
In reply to:

Mateus1: I expected better colours than Panasonic but they are even worse, and far behind Fuji, Panasonic, Sony.

IQ dissapointed.

@J A C S: obviously there's no point in going on here (and no one reading, either). Still waiting for your facts, though.

Link | Posted on Jan 9, 2017 at 18:23 UTC
In reply to:

Mateus1: I expected better colours than Panasonic but they are even worse, and far behind Fuji, Panasonic, Sony.

IQ dissapointed.

@J A C S: for someone supposedly in the knowledge, you wrote kind of a weird reply. Color matrices are a model of color response, this is what physics is all about, building models! Since you invoke your credentials, I'll invoke mine. I am a researcher in physics since 20 years, and like DxO I do not try to "beat physics". We just DO physics!

And as for further facts (which you still do not provide): I just replicated camera A with camera B by developping Imaging Resource RAW samples of the 5D4 and A7RII. They are undistinguishable when using the same settings for both in Lightroom (including Adobe Standard color profile). Of course Lightroom provides the "camera" color profiles too, under which you can approach the distinct JPEG looks of either camera.

Link | Posted on Jan 9, 2017 at 15:55 UTC
In reply to:

Mateus1: I expected better colours than Panasonic but they are even worse, and far behind Fuji, Panasonic, Sony.

IQ dissapointed.

@achim K

yes sorry, I forgot that we have entered the post-truth era :-)

Link | Posted on Jan 9, 2017 at 08:24 UTC
In reply to:

Mateus1: I expected better colours than Panasonic but they are even worse, and far behind Fuji, Panasonic, Sony.

IQ dissapointed.

@J A C S: where are the facts supporting your claims? You can go on like this, no problem, but without facts, you'll have a hard time convincing people. Also the logic is flawed: you don't need to factor in the human eye into that, because the eye won't change when comparing two cameras.

What matters is the CFA matrices, all the coefficients are up on the DxO website and they are extremely similar between the two cameras.

If you have a hard time believing this then just convince yourself by processing same Imaging Resource raw from the two camera with your preferred converter and get to the obvious conclusion: you will see that there is no color signature difference between 5D4 and A7R2.

What people usually refer to with "brand X colors" is the jpeg engine tweaks. If you want Canon colors then select "canon rendering" in dxo optics pro and you're done, even on an A7R2.

Link | Posted on Jan 9, 2017 at 08:13 UTC
In reply to:

Mateus1: I expected better colours than Panasonic but they are even worse, and far behind Fuji, Panasonic, Sony.

IQ dissapointed.

@J A C S and Najinsky: With previous generations of canon sensors, CFA arrays have been traditionally more color blind with Canon than with Sony sensors. This was done to boost high iso sensitivity. See for instance the color metamerism indices as reported by DxO (higher is stronger color separation):

Canon 5DII: 80
Canon 5DIII: 74
A7RII: 85

So if anything, "canon colors" have actually been more color blind that Sony colors for a long time. This is changing now with the new sensor generation of Canon, which is basically very close to a Sony design. This is also true on the CFA front, with similar color metamerism indices (85) and similar color matrices between the 5DIV and A7RII. In that case, with the CFA matrices being highly similar, I doubt that one could distinguish a 5D4 shot from an A7R2 shot on color alone when processed with the same raw converter.

Link | Posted on Jan 8, 2017 at 21:02 UTC
In reply to:

Mateus1: I expected better colours than Panasonic but they are even worse, and far behind Fuji, Panasonic, Sony.

IQ dissapointed.

@J A C S

Ah... gotta love this canon color myth. Some of these are edited raw files. So these are the colors of the raw processor, which are neither better nor worse than those of any other camera edited through the same raw processor.

Link | Posted on Jan 8, 2017 at 19:27 UTC

- Full format?
- yes sir, my cards are always fully formatted.

Link | Posted on Dec 28, 2016 at 19:42 UTC as 330th comment | 5 replies
On article Modern Mirrorless: Canon EOS M5 Review (1594 comments in total)
In reply to:

6x9: "In lower light and at higher ISO values, the EOS M5 is behind the competition by around one stop, which is a significant disparity at this point".

Yep. This is the price to pay for dual pixel PD. Smaller pixels mean lower S/N ratio, in general. Even if amplified signals are combined further in circuitry (after phase detection information is read), noise is already there. Aeraging two signals will (theoretically) improve S/N, but not enough to compensate for 2 times lower input signal (compared to a standard pixel).

No.

Summing two half pixels recovers the noise performance of a full pixel, unless noise is correlated between these half pixels. There is no reason noise should be correlated, unless this is a sensor issue.

What we're seeing here is rather the current lag of canon sensor performance relative to competition, not a dual-pixel disadvantage.

Link | Posted on Dec 20, 2016 at 19:21 UTC
On article Action-packed: Sony a6500 review (1127 comments in total)
In reply to:

RubberDials: The IBIS is described as 'not class leading'. I find this a strange comment since the A6500 is the ONLY mirrorless aps-c camera to have IBIS.

Is the A6500's class deemed to include DSLRs like the Pentax K3II? Or are you judging it against the IBIS of m43?

If the latter then I think you open yourself up to obvious criticism as it is self evidently more difficult to stabilise an aps-c sensor - which is larger - than an m43 one.

In this case, not class-leading means still very good. Olympus IBIS is beyond this world in terms of efficiency.

Link | Posted on Dec 15, 2016 at 03:41 UTC
On article Action-packed: Sony a6500 review (1127 comments in total)
In reply to:

MikeF4Black: DPR's current obsession with flavour-of-the-week catchphrases is really annoying.

@DFPanno : reader feedback does not require "an awful lot of time", and is usually regarded as useful. I'd say there are much more time-consuming and much less useful activities here on DPR, like for instance spending hours on the forums fueling my-gear-is-better-than-your-gear wars (not specifically targeted at you, just a general comment here).

Link | Posted on Dec 6, 2016 at 09:40 UTC
On article Action-packed: Sony a6500 review (1127 comments in total)
In reply to:

MikeF4Black: DPR's current obsession with flavour-of-the-week catchphrases is really annoying.

Richard, what MikeF4Black means is that the entire English-speaking world is caught into this obsession of writing two-part titles starting with a pun, a colon and then what it's about. I'm afraid the rest of the world is catching up with this, too. I agree that it's become so uniformitarian that it's starting to become repelling, just like... let me think... hipster beards for instance.

Link | Posted on Dec 5, 2016 at 16:54 UTC
On article Gear of the Year: Carey's choice - Canon PowerShot G9 X (212 comments in total)
In reply to:

Frank C.: My phone is thinner still, and it has a camera built in too! Thin + thin = thick & cumbersome, no? so will pass...

You're both right, brothers.

Link | Posted on Dec 5, 2016 at 15:12 UTC

Would be curious to know how they implement phase-detect AF

Link | Posted on Sep 21, 2011 at 18:08 UTC as 196th comment | 2 replies
Total: 18, showing: 1 – 18