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Messages - Aglet

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One of my complaints about DXO has been that they measure a sensor and declare a camera to be the best without ever taking a photo.
They have started testing lenses a while back, and publishing results in conjunction with DPR.  I suspect that this has raised questions as to what the rating of a camera would be if a lens were installed.
We have long noted that a image from 6 or 10 mp sensor looks very sharp when viewed at 100%.  This is due to a lens resolution, circle of confusion, and other factors.  When you get high pixel densities, resolution of the system does not scale, but is always a improvement.
That is what DXO mark is saying.
Technically,  the MTF of the system is equal to the MTF of the individual components multiplied together, and is always less than the weakest link.  Even film has MTF values specified.
So, for simplicity,  if a lens has a MTF of 0.9, a Body 0.8,  together they are 0.72.  Increase the body to 0.85, and the system becomes 0.765.  Better, but not a revolution because the lens needs to get better as well.
However, there are those who only look at one part of the picture, the number of MP, for example and happily believe that with twice the MP, they get twice the resolution. (No reflection on CR members who mostly know better).
One thing that the D800 sensor brings is very noticeable improvement in dynamic range under harsh lighting conditions such as bright sun and deep shadows.

That's about right

Or, what DxOmark's testing translates to in this regard is simply

DIMINISHING RETURNS of increasing sensor resolution

Adding 60% more MP does not give correspondingly (square root of ratio) more resolution.

Adding more MP can increase overall acuity, since it's part of an equation containing the factors mentioned above, but it's only one factor.

another good example is in DPreview's comparison of the AA-less D7100 and the AA-equipped D5200, both with very similar sensors of equivalent pixel count.

only in the small range of optimal lens performance (wider apertures) can a difference be noticed whereas regular shooting with real-world lenses and settings this AA-less sensor performance is no better.
(personally I'd take the d5200 over the 7100 for better performance/cost, slightly lower overall sensor noise and it oddly fit my hand better than the 7100)

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 02, 2013, 11:57:51 PM »
Know how I know that Mikael Residal is gone?  This DR pissing contest happens about once every two weeks, instead of about once every two days.  That, and no more pics of barbecues.  Honestly, even the barbecues were more interesting than this constant repetitive crap.

Agree to disagree, or I have a hunch that more people will start disappearing - both 11-stoppers and 14-stoppers.

I can certainly agree with you on this.

OK, let's take this, er..., discussion outside.  ;D

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 02, 2013, 11:19:52 PM »
To jump the ship just for that seems unwise to me. There are many other factors.
There certainly are many factors.
But, for some of us, clean raw files that provide maximum malleability in post are worth the effort and cost to ADD the gear, not necessarily SWITCH to it.
My 5d2 was a PoS so I sold it and got a FF Nikon that kicks butt for clean files.  Extra DR and MP are a bonus.  20 to 25MP were enough for what I needed in resolution, but I really needed NO pattern noise.  Certainly miss the 5d2's superior live-view, D800's LV is terrible in low light.

I still use Canon crop bodies, along with a few Nikon and Pentax too.  I use whatever tool I LIKE or is best for the shot.
I still like using Canons better than Nikons, but Pentax is very nice too if you don't mind lack of glass options.
If Canon makes a FF body as good as the Nikon for clean low ISO raw files, I'll likely buy it, especially if it arrives this year and doesn't cost more than $3-4k.

I just saw that Nikon updated their firmware.  For a whole host of cameras.

Does this mean that Nikon is more committed to their customers than Canon or simply that the firmware share lots of components and if a general (non-camera control) component is upgraded it is readily shared across the line ?

does look like some common features + model-specific ones

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 02, 2013, 11:09:21 PM »
Aglet, how about you provide us a beautiful RAW file that you spend time, effort, and possibly money to get first? Please do show us the very best d800 RAW file of you very best work and then I promise I will do the same.

It must be your best, no less.

how about something easier, you show us some 100 iso test shots from your 5d2.... if you still have it.
Blank sheet of white paper, exposed at 1 EV values from +4 to -10, no Lum or Chroma NR, black level crusher set to ZERO, pushed in ACR or LR, until visible banding appears at 100%
Show us what EV levels you no longer get FPN.
Do and post that, then I'll do the same with a $400 Nikon.
OK, you go'head and do yours.  We're waiting. :)

D4, D3S, D3X, D3, D7000 and D3200 firmware updates added as well.

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 02, 2013, 01:51:22 PM »
I was pleasantly surprised by the improved sensor performance from Nikon’s modern crop bodies as well.
I’ve been too often disappointed by my early version 5d2 (which I’m now convinced was a lemon and got rid of) and my also early-production 7D, which I’ve also sold.
I should have returned BOTH of those turkeys to Canon as soon as I discovered the problems. On top of that, my 5d2 did often like to meter rather conservatively, usually under-exposing more than my other Canon bodies, but not consistently.  I hated that thing!  The only time I got consistent and decent results with it was shooting fully manual where lighting wasn’t changing faster than I could keep up to it.  In variable and mixed lighting (incl flash fill) i often got inconsistent and under-exposed results from it.  A major frustration when I could easily get reliable and consistent results from my other Canon bodies in similar conditions.

Since nobody here’s ever offered their 5d2 raw files or shot test samples to compare FPN, all I’ve had to work with were files DL’d from I-R.  Their raw file could be pushed a LOT more than mine could and not show significant FPN.  My 5d2 files would show FPN from shades as high as 3EV below metered zero if those shades were pushed as little as +1EV. This is totally unacceptable from a FF body of that cost.
I don’t think I’m the only one who’s experienced this either.  There seems to be a fair bit of variability in FPN performance within samples of the same model.  One CR poster even commented recently he sent his 1Dx back because of poor FPN performance so even pricey new models are not immune. (not sure if that was low ISO or not tho)

I still prefer the handling, color rendition and WB performance of Canon over the other mfrs.  I still have a handful of Canon crop bodies, newest now being the 60D.  Of the bunch, the 60D is the worst offender for low ISO FPN, but it is much better than my 7D was, but not as good as my late production 40D or even my old Rebels.
I’m still hoping Canon will produce a body with a sensor system that doesn’t have the high read noise problems that afflicts so many of their recent cameras.  The 6D is the best I’ve tried so far but still has some vertical banding visible around 400 iso on the sample I tested.  If the price drops enough, I’ll likely still buy one to try it.  Same with the 7d2 or 70d where I also need the better AF system.
I’m keeping my Best EF glass for another year or so.  If Canon does not produce a camera I can afford, that can provide low ISO with clean shadow areas like the competitors can, i will have held my breath long enough.

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 02, 2013, 01:47:09 PM »
The vast majority of us DO know how to get the most from our gear, even with challenging exposures.
But, as in Ankorwatt’s dappled sunlit image, lifting some dark areas of even a reasonably exposed image will often show FPN.
It comes down to a matter of individual tastes.  I prefer the lightened look of the shadow lifted crop he’s shown.  I prefer slightly less lifted, actually, but even so, that would still be enough to show FPN.

Seems like many others are saying, “NO!  You shouldn’t do that!  It doesn’t look natural.”
To which I reply, “Like HEL_ it doesn’t.”  You need to actually LOOK at the scene you’re shooting, what can you see?  Are you going to represent the final image like you saw it or are you going to capture it within the limitations and compromises of your equipment and technique?

When you shift your gaze around a real-life scene, your eyes are very much a center-weighted-averaging-metered device. (more like between CWA and “partial” in Canon parlance)  If you were standing where he took the shot and were to look at that lady sitting in the shade, your eyes would adjust to provide your brain with a view more like the shadow-lifted example than the silhouetted version.

When I create an image like that, I want someone viewing that image to be able to look around it and see the kind of details they would see if they had been there, not the overly contrasted rendition provided by many cameras/software and seemingly preferred by many voiciferous shooters.  This is especially applicable to large prints, where you’re actually moving your gaze around from one area to another.  It’s not unreasonable to want or expect to see some detail in the darker areas as in Ankorwatt’s example.
Yes, this is a matter of TASTE.  If you like clipped shadows, go ahead and produce them.
I don’t like them, my customers compliment me on what they see when I process and print an image the way _I_ like it.  That’s what matters, the end result. 
As means to that end, i dumped my 5d2 and replaced it with a D800.  Works MUCH better for what I need from it.

So advising on matters of post-processing “taste” is a style argument and does not really address technical shortcomings of the actual hardware.  That’s best left to Canon engineers, we need to spur THEM to do better.

The argument still remains, however, that some cameras do not allow us to produce images that meet some of our tastes in some conditions whereas other cameras ARE capable of doing just that without difficulty or extra work.  This will remain the case until Canon can remedy their read noise problems.  If you shoot Canon and want to lift shadows then you are stuck with optimizing the compromises or other work-arounds.

Does the competition also seem to offer better lenses for the same or less money?
there's give and take between canon and nikon, each have a bit of something the other doesn't, much of it being quite comparable otherwise.
Pentax is certainly weak on modern glass.
MFT/FT is coming along fairly well.

  Do they give you free software to process their RAW images? You need to compare system cost, not just camera cost.
Nikon's free ViewNX processes raw files
Pentax supplies SilkyPix (for free) and can also save DNG files directly as its native raw format on many bodies.

baddaboom ;)

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 02, 2013, 03:48:17 AM »
Now show me a Nikon file that could do this.

That's a lot like, "show me a Canon file that can do this?"
you just moved the sliders the other way.

And SINCE PATTERN NOISE IS NOT AN ISSUE AT THE HIGHLIGHT END, exposing to retain as much hilite detail as possible and BRINGING UP CLEAN SHADOWS is, more often, the desirable approach.
Unless, that is, you're shooting with some bandy PoS camera whose noisy raw files won't allow you to do that w-o required a whole lot of extra time in Photoshop.
(Are you an Adobe sales rep? ;) )

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 02, 2013, 03:39:32 AM »
Kind of like Aglet wanting a camera to automatically level for him!

check out a Pentax K5  :P

Learn how to expose optimally for the image you want and your equipments capabilities and stop relying on being able to post process the crap out of badly underexposed images when taken with a Canon. Ever notice that nobody ever complains about the highlight recovery of Canon? That is not true if you look at Nikon forums, all Nikon users know you must underexpose to get optimal results, start overexposing your Canon and your "issues" will largely evaporate.

that means, in some cases, ETTR but exposing to not clip highlites and then recurving the rest in post
a technique that works better with most other mfr's cameras that don't begin with "C"

Really, no kidding.
April 01 firmware updates.
Dare we load them?  ;D

Check your country's Nikon site, support, downloads, firmware, DSLR, ....

it's up on Canadian and US sites



update affects the following:

  • Support for AF-S NIKKOR 800mm f/5.6E FL ED VR added.
  • Improved ubject tracking performance in AF-C (continuous-servo autofocus) mode.
  • Gamut for Adobe RGB images displayed in the camera's monitor has been changed. Enables more vivid display.
  • Resolved always-on exposure preview With live view in [M] (Manual) exposure mode
  • Resolved halting of movie recording in some very rare cases when certain memory cards were used, even when the time remaining display indicated remaining recording time.
  • Resolved purple line along right edge of image when shooting at an image quality setting of TIFF (RGB) and an image size setting of Small.
  • Resolved rare case of images recorded in JPEG format that could not be opened by some software applications.
  • Resolved rare cases of shifted colors when shooting with white balance set to a specific color temperature, as with Preset manual or selected color temp.

40D, my first DSLR and still my favorite Canon body.
not worth selling, will keep, shoot, and cherish. It's my benchmark crop camera.

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 01, 2013, 01:07:24 PM »
14 stop in a raw histogram?
the motive was enough, from  the sun and down to  the shadows , deep enogue to show pattern noise from the canon.

Dude, you're the only one on this forum that's ever used the word "motive" so everyone one's pretty sure they now know who it is.
image, scene, shot, picture, composition are words that would have helped keep you under cover. ;)
Welcome back, BTW.

Third Party Manufacturers / Re: Crazy... go Nikon?
« on: April 01, 2013, 02:34:08 AM »
At the very outset I offer my apologies for wading into this rather heated discussion. This is a shot I took with the 6D. Please let me know how a Nikon camera would have helped with this.

I'm just a hobbyist and humble student of photography ... HELP!
I like your shot and glad you got a 6D instead of going the cheap route with a 5d2.
the 6d has improved significantly in areas where some of us cursed the 5d2 as PoS.
the shot, even if it was level in reality (likely not?) would likely appear a little better with some rotation applied to provide a more natural symmetry and sense of vertical balance.
tho many of us are horizonally-challenged despite the best efforts of built in artificial horizons.  I need Pentax's built in auto-level sensor rotation. :)

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