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181
EOS Bodies / Re: Will the D1-x really be superior to the new 5DIII?
« on: April 07, 2012, 12:41:21 AM »
The 5DIII's AF [...] it's still not as snappy or responsive as even my ancient 1DII.

With all due respect, I must disagree here. What lens(es) are you using and what AF settings when you say that the 5DIII is not as snappy or responsive in autofocusing as the 1DII?

With my 24mm f/1.4 L II, 85mm/100mm f/1.8 / f/2.0, 70-200 mm f/2.8L II, 135mm f/2.0L, and other fast-focusing lenses, I find the AF to be more snappy and responsive as the best bodies from both Nikon and Canon that I have ever used--until now this does not include the D4, which, together with the 1DX, would be the only camera more responsive than the 5D3. With a lens like the Tamron 60mm f/2.0 Macro for Canon, on the other hand, AF is not as "snappy," but here the culpability lies with the lens rather than the body. (That lens is excellent, by the way--it is just noisy and slow due to its not being equipped with the latest silent focusing motors.)

And the low light EV -2 sensitivity of the 5D3 is absolutely for real, not a marketing gimmick. I was shooting in theatre/jazz production Thursday evening and had no problem focusing anywhere in the dark theatre--and I'm not talking about the stage, but about the audience. Starting with ISO 25K, f/1.4, 1/10th of a second and even darker than that--it could nail focus like magic. It was necessarily to precisely aim the selected focus point at the subject, but it was easy and felt nearly too good to be true.

182
The lower ends of ISO for the 5D3 are not necessarily spectacular improvements over low ISO from previous Canon cameras or versus the Nikon D800 (but very comparable). This is simply because low ISO performance has gotten as good as it can get already.

But the amazing thing about the 5D3 that doesn't show up in DxO-Mark style testing is how flat its image quality curve really is. Although it may reach SNR 85% at a somewhat lower value, its high image quality stays essentially the same for a range of several thousand ISO values.

Just to prove this, I am attaching an unedited ISO 3,200 100% crop from my 5D3. There has never been this little difference between ISO 3,200 and ISO 100 in any other camera. Period. Not even the D4.

As I have mentioned before, the 5D3 seems objectively better by three stops compared to the 7D, two stops better compared to the 5D2. At low ISO there is no point arguing, but the difference is obvious anywhere above ISO 800.

Canon has a winner on their hands. In my mind, the values of the 7D, 5D2, and all previous cameras have just dropped by about 90%. If you are trying to decide between a 7D, 5D2, or the 5D3, there is absolutely no comparison. Three stops means eight times better (and to me, worth eight times as much) as the 7D. Two stops means four times better (and to me, literally worth four times as much) as the 5D2.

And the improved autofocus and all that is the incredibly delicious icing on the cake. For those who don't rely heavily on autofocus systems, there is still reason enough to buy the 5D3. And for those whose jobs depend on taking rapid-fire sequences of randomly moving targets in perfect focus, the improved autofocus added to the image quality makes the 5D3 the perfect camera. That was something the 7D could do to some extent, and which the 5D2 could not do at all.

183
Lenses / Re: Sigma 85 1.4 vs Canon 85 1.2L
« on: April 05, 2012, 01:53:28 PM »
Go with the Sigma 1.4. For me it is more versatile and just as sharp.

184
EOS Bodies - For Stills / Re: 5D MKIII vs 1Ds MKIII
« on: April 03, 2012, 10:47:37 AM »
tom, I think you should get the 5D3. The other camera you mention was good for its time period. But it's like a Pentium 4 computer vs. a Sandy Bridge computer. I don't know if this analogy rings any bells, but I'm trying to say that the 5D3 is a revolutionary improvement compared to the  1Ds MKIII.

If you were comparing the EOS-1D Mark IV vs. the 5D3, then I would say it is more of a wash, although the 5D3 sensor is twice as good even compared to the EOS-1D Mark IV.

All these people talking about "barely a few stops better" need to realize that even one stop is twice as good, i.e., 100% better. After a week with the 5D3, I would rather have it than any three camera bodies prior to the EOS-1D Mark IV, and it is also easily worth more than the $5,000 EOS-1D Mark IV.

So even for $3,500 (or whatever the price is in your country), the 5D3 is the only choice that I would consider if I were in your situation.

185
EOS Bodies / Re: Shot wedding with 5DIII, dissapointed in AF
« on: April 02, 2012, 06:12:46 PM »
This is not what I am getting. I shot an inauguration on Friday with the 5D3 and autofocus was insanely perfect and snappy down to exposures of 1/30th at f/2.0 at ISO 12,800 with the 135mm f/2.0L.

I also shot a track meet that ran until 1030 pm under poor stadium lights, and tracking was right on, even with runners going in and out of the uneven beams of very dim lights, or backlit in the curves of the track.

The AF of the 5D3 is absolutely incomparably better than the 5D2, and I have loads of experience to be able to make this statement.

BTW, I am using the automatic focus tracking which uses the center spot to lock on and then tracks it to any of the other 61 AF points. It is the mode that shows up with a border around all the AF points and a bold center point, when you are selecting autofocus modes. (I am describing the view through the viewfinder.)

Also, AF worked just as well even if I selected the initial focusing point as one of the other ones rather than the center.


186
Technical Support / Re: Dynamic Range War
« on: March 29, 2012, 03:25:00 PM »
I'd caution strongly against expose to the right

Expose properly, ideally with a well-calibrated incident meter.

If you've still got crushed shadows and blown highlights in critical areas of the image, you either need better light or you need to go to HDR -- and that's assuming that the crushed shadows and blown highlights are a problem in the first place...the kinds of photography where it's a problem but you can't either fix the light or use HDR are basically nonexistent.

Don't forget that there's a great deal more DR to be had in any well-exposed RAW image than what comes right out of the converter with the default settings.



Good points, and actually you have explained very well what the point of ETTR is, which is to maximize the potential of camera sensors, which are capable of far more than what is offered by default exposure settings. The camera sensors are so good that the dynamic range of most scenes is far within the maximum DR capabilities of the sensor. So photographers are faced with a question--use zero exposure compensation, or try to manually expose to get the most detail? Due to the way that data is recorded (2,048 bits of data for the right side in the brightest stop of light), there is much more data recorded on the right side of the histogram.

http://schewephoto.com/ETTR/index.html

There is an amazing example on that page which shows that the little tiny blip on the right side of the sensor (way, way, overexposed, and extreme ETTRing) actually has as much image detail as almost the entire image histogram. That's not what anyone should do. The point is just to show how much more data and details are being recorded for any part of the image that is on the right side of the histogram, compared to the left.


187
Technical Support / Re: Dynamic Range War
« on: March 29, 2012, 03:01:21 PM »
If you want to get the most detail from your images, then the major area of your image's histogram should be towards the right.

Thanks for pointing that out, I only discovered this fact after some try and error - maybe they should have put a  sentence like this in the manual :-p

The concept is termed ETTR.

Great point, I would like to add a link a really cool article on the subject as well:

http://www.luminous-landscape.com/tutorials/expose-right.shtml

In summary,

"For Maximum S/N Ratio [i.e., image quality]

"The simple lesson to be learned from this is to bias your exposures so that the histogram is snugged up to the right, but not to the point that the highlights are blown. This can usually be seen by the flashing alert on most camera review screens. Just back off so that the flashing stops."

There are photos of the histograms in the article.

Note that for a dark subject, you still need the image to be darker than for a bright subject, so it is overly simplistic to say "always have the histogram snugged up to the right." But to get the most details out of all the data that is available in the light coming from the subject, that is the way.

188
Technical Support / Re: Dynamic Range War
« on: March 29, 2012, 02:58:46 PM »
The concept is termed ETTR.
While it might not make me seem like a pro (hey, I am not!): I didn't know about that, thanks again dr. neuro!

The only thing left for me to wonder when shooting at low light is if it's better to have a properly exposed histogram at higher iso or a histogram that leans to the left at lower iso. Using lr4 and its smart shadow recovery, I'm tending towards the latter with my aps-c sensor, because higher iso than 800 really ruins the picture while 1ev underexposure does not.

That is a question that there may never be a definitive answer for.

In my experience it depends on the camera. Some cameras whose high ISO modes are just "software enhanced" are better used at lower ISOs with slight underexposure, and then pushed on the comupter with software that is better designed and can increase the brightness without resulting in as much nosie as the in-camera "software-enhanced" ISO boosting.

For other cameras that really do have the ability to increase their light sensitivity, it is absolutely better to increase the ISO to get more bits of detail in the file, and then try to decrease noise later. Underexposing reduces the actual amount of data that is captured in the scene. So in an ideal world, you would get the proper exposure by increasing the ISO, and then reduce the nosie in post-processing, and your image would have higher quality than shooting underexposed and then boosting the ISO with software.

It all depends on whether the ISO level that you are shooting at is provided by the intrinsic analog/physics capabilities of the image sensor physics (in which case you should shoot at high ISO and reduce noise afterwards), or by the camera's image processing (in which case you should shoot at lower ISO and increase brightness afterwards).

Boosting ISO with software always reduces the amount of usable data in the image (which is why the Nikon D4 only has 6-8 bits of DR at ISO 200,000, because it is software boosted). So that is what you always want to avoid.

189
Technical Support / Re: Dynamic Range War
« on: March 29, 2012, 02:26:33 PM »
For the record, slide film has a smaller dynamic range than negative film.

However, it still held at least as much "data" as did negative film.

Therefore, there was much more detail in the image coming from a slide, but exposure latitude was not as forgiving. Blown highlights, and lost shadows were more likely with slide film. Overexposure in particular is much less of a problem with negative film, because there was a lot of headroom with negative film. Not so with slide film.

The way this compares to digital images is as follows:

Approximately the brightest 1/2 of the image data (i.e., the right side of the histogram) represents one stop. Therefore, the most image detail is in this area. Subtle variations between brightness are easily discernable.

The darkest 1/2 of the image data is divided up as if it was another image, like this:

* the brightest 1/2 of the remaining 1/2 of the image data (i.e., the upper half of the bottom half of the histogram) contains another stop of brightness data. There is slightly less detail, since not as much data is used to represent one stop of light.

The remaining quarter of the image data is divided up again, recursively:

* the brightest 1/2 of the remaining 1/4 of the image data contains another stop of brightness. There is significantly less detail, etc.

Let's assume that your image data is stored as 16 bits per pixel, and the primary part of your image is exposed at EV 16.

Then the top 8 bits contain a detailed view of the brightest one stop of the image from EV 16.0 to 16.9.
The  next 4 bits contain a moderately detailed view of the next brightest stop of the image from EV 15.0 to 15.9.
The next 2 bits contain a poorly detailed view of the next brightest stop of the image from EV 14.0 to 14.9.
The final 1 bit contains a very low detail view of the darkest stop of the image from EV 13.0 to 13.9.


This is how it works, simplified, with "linear gamma."

All modern cameras use non-linear gamma systems to expand the dynamic range of linear gamma from the maximum of four stops to many more stops of dynamic range.

But the principle is the same.

If you want to get the most detail from your images, then the major area of your image's histogram should be towards the right.

Try taking a photo of a subject with little dynamic range, like a a square foot in the middle of a field of green grass. If the image is underexposed, the histogram will make a narrow band towards the left side. The size of the band represents the detail recorded from the grass.
If the image is properly exposed, the band will be a little bit larger showing that more detail is being recorded in the upper area of the histogram which is more detailed because more bits are used to record each stop of light.

190
5D MK III Sample Images / Re: 5D MK III Images
« on: March 28, 2012, 11:11:02 PM »
This photo was taken with the 135mm f/2.0 L lens, part of the first set of photos taken with the 5D3 that I received today from J&R.

191
EOS Bodies / Re: DPReview Canon 5D mark III noise comparison
« on: March 28, 2012, 04:38:49 PM »


Ok, my point is I'm looking at the DPReview comparisons and actually seeing a better looking image with the 5DII at ISO 800.  And we don't know what they used to do the comparisons, or what settings.

I have a 5DIII sitting at home waiting for me, so I'll do my own test tonight against my 5DII using the ACR RC and Lightroom to evaluate.  Hopefully I get better results than what I'm seeing on DPReview!

Hey, I'm your friend! My camera has arrived today as well! My box arrived at home and I am looking forward to doing the same thing. Hope I can get off work early...

I am sorry as well. I think I was a little too harsh, so my apologies to you.

192
I predict 85-90 for the 5D3.

193
Lenses / Re: Best lens/TC setup for football game
« on: March 28, 2012, 04:06:44 PM »
Whatever you do, don't use the 70-200mm F/2.8L with 2x TC III for shooting football, unless you just want portraits when there is no action happening.

It will be a slow and unwieldy f/5.6 combination that will be less-sharp than the other options. And f/5.6 with a TC is worse in autofocus and several other ways, than f/5.6 is with a single lens like the other two choices.

Like someone said, you won't be able to keep shooting much as soon as it gets near sunset, no matter which of these options you choose. If you get some afternoon games in late season you'll be fine and then my best option would be the 400mm f/5.6. You can wait in the corner about 75 feet back from the home goal line and two feet out of the boundary line, and pretty much cover every play in the field. You can still get tightly-framed pictures of plays near the touchdown line, and looser framed shots of everything else.

194
EOS Bodies / Re: DPReview Canon 5D mark III noise comparison
« on: March 28, 2012, 03:54:16 PM »
Yeah, I know all that.  And you can't compare the JPEG's generated by the cameras, because most people who want quality already know to shoot RAW and have their computer comvert to JPEG.  Comparing in-camera generated JPEG's is not even close to comparing apples to apples if you want to gauge how the new sensor does at differen't ISO's, as the new Digic 5+ processor is some 30X more powerful than the one in the 5DII, and thus has time to do good conversions of the RAW data.

Sorry, I should have been more positive. You are totally right that RAW is the way to make real comparisons.

The truth that I am trying to communicate is that the sharpness of "RAW" images when posted as JPEG images really depends on the processing done to them. The ultimate maximum level of sharpness depends on the sensor and AA filter of course, but I have seen scores of messed-up comparisons where a "better/sharper" camera's RAW images were just over-sharpened, and then compared to under-sharpened images from another camera.

The classic example of dishonesty with sharpening RAW images is to "prove" to newbies that they should "always shoot RAW." They give super sharp screen images produced by Lightroom from RAW images that are sharpened for viewing on a monitor, side-by-side with unsharpened (or even blurred) JPEG images from the camera at the lowest sharpening level. And then they crow about their conclusion that shooting RAW is the only pure way to take pictures, when it was all cooked.

And the very first word of my post was that noise isn't about sharpness.

I'm not sure what point you are trying to get across, anyway. I am defending the 5D3 based on accurate testing done by DP Review, and you are bringing up an irrelevant controversy about whether experienced shooters know how to shoot RAW vs JPEG and the power of the new Digic 5+ processor.

195
EOS Bodies / Re: Have soft images? This helped me a ton!
« on: March 28, 2012, 03:35:33 PM »
Hooray to this thread! As a past photography instructor I have found the same fact to be true. Whenever soft images come up, 98% of the time it is due to missed focus. Other mysterious factors like "my camera is not sharp" are about as likely to be true as for lightning to strike you.

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