March 04, 2015, 06:40:56 AM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - vscd

Pages: 1 2 [3] 4 5 ... 16
31
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: January 11, 2015, 06:04:24 PM »
Quote
This is why so many pros (and avid enthusiasts like myself) have $30,000 - 50,000 kits. They are exceptionally skilled, and can maximize the potential of that gear.

And Sebastião Salgado or Steve Mc Curry can make a picture better than those, with a used 200$ Canon/Nikon and a bunch of TriX Rolls and a bottle of D76.    ;)

Of course, good gear takes the pro a few steps further... but it always comes with tradeoffs or high cost. The RAW Files of my DP3M or a Nikon D810 from a friend are already to large for the daily postprocessing. Or let me say, I would not use the full resolution everytime. But, the drawbacks, like lower ISO (more noise) will be there everytime I use the cam.

If the rumours are true I will like the way Canon thinks about the 5D line... just different sensortypes like the A7, A7R or A7S. So everyone can choose the camera, which fit's his needs best... great times ahead, I think.

For me, the sweet spot is something around 16MP/18MP on fullframe (like the D3s or 1DX), but that's just my opinion.

Btw. the interesting proof for a correlation between ISO and dynamic range is the new A7 II from Sony. Given the same sensor as the A7 had, the DR got lower while the ISO rised up ;) So, while Canon has better High-ISO capabilties... the DR is lacking. It's a commitment to High ISO, I think. The rest is physics. Giving up the pace on ISO would help Canon to come to the same DR as Sony does, but they don't seem to want this way.   

http://www.dxomark.com/Reviews/Sony-A7II-sensor-review-Mighty-mirrorless/Sony-A7II-sensor-measurement-Same-sensor-similar-scores


32
EOS Bodies / Re: NEW CAMERA - EOS 80D?
« on: January 09, 2015, 07:04:45 PM »
I also think that the time of a splitted Rebel / 80D Line could be over. With the new SL1 and the xxD xxxD and xxxxD Line we nearly have 3 or 4 Lines of APS-C Cams, plus one Line for Professional use (7D Mark 2). As the 7D Mark 2 went up on the line with a quite good body I think the Rebelline will merged together with the semiprofessional 70D/80D.

The lower cost models will be kept at 4 digits. After an imagenery 90D there is no number left, anyway ;) And the next would be... hey, Rebel line Number (at least in Europe)  :o

33
EOS Bodies - For Stills / Re: New Firmware Coming for EOS 5D Mark III
« on: January 03, 2015, 01:07:20 PM »
...maybe they just closed the Magic Lantern entry point  :-[

34
Lenses / Re: Review: Canon EF 100-400mm f/4.5-5.6L IS II
« on: December 31, 2014, 07:24:07 AM »
Quote
I did not know that lenses change sharpness qualities FF vs crop. Hmmmm.

They recognize the body and adjust the optical formula inside the tube  ;D

Ok, fun aside. I think this statement goes toward the direction that no fullframe from Canon has enough MPixel that cropping from fullframe would be as good as taking a real APS-C.

LP/imagehight is, as the name suggests, dependent from the sensorsize.

35
Lenses / Re: Comparison: Yongnuo 50mm f/1.8 vs Canon 50mm f/1.8
« on: December 31, 2014, 07:18:13 AM »
Quote
Yes, you can buy dozens of YONGNUO 50mm (according to them will breaking). What you can not do is get clear images with high contrast and vignetting and chromatic aberration corrected at F1.4 and even in F2 with Canon / YONGNUO. Only in f2.8 they begin to deliver decently sharp images, such as Sigma Art delivery even with aperture wide open.

There is always a better one outside. For example, if you can live without AF you get better results with a Samyang 35mm than with the 35mm Sigma ART. At half the price.

I never heard of the Yongnuo 50mm here in Europe. Seems to be a new cheap lens from the chinese (?) manufacturer. The Flashtriggers I got from Yongnuo are quite good and the Flashes itself are not far off the Big Canon Flashes. So I'm really interested in the new lens-line of yongnuo. Not in this focal length, but in general.

36
Lenses / Re: Review: Canon EF 100-400mm f/4.5-5.6L IS II
« on: December 31, 2014, 07:01:59 AM »
For me the new 100-400 is a quite interesting lense to replace the 70-200 f2.8 range from the Holy Trinity. Using the 70-200 (or in my case the 80-200L) I recognized that I far more used the longer end instead of the wide one.

The difference between 80mm and 100mm is not that big, but the 400mm are quite a number on airshows or other larger places. Now this lense even comes near to a useable Makro and has an improved IS+AF.

Has anyone experiences with this lens, handhold on a location? It seems to be quite heavy as the only drawback. And is the AF+IS better than the last 70-200 L IS II?

37
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 28, 2014, 06:23:53 PM »
Quote
Go to DPreviews Scene comparison tool, select the 5D3 and D8x0 or A7r and look at the shrinking text bits.
If the text remains legible to different lines the idea that the additional resolution doesn't change a thing is absurd.
If not one should better see the doctor...

The Tests on dpreview have a totally different base, as for example even the focal lengths and the whole lenstypes differ. To get the different sensortypes out of the equation we should only compare the same Manufacturer and the same lens, otherwise the whole test has too many different sideeffects. For example, the sensor from the A7R and Nikon D800 are even the same sensors, but the results differ. Explain it. And the Sigma Merrill as APS-C even beats the Medium Format Pentax 645.

(f.y.i.:    http://tf.weimarnetz.de/downloads/sigma.png)

I just posted a picture that, for example, a Canon 7D with 18 MPixel was not able to get the sharpness of an old Canon 5D with 13 MPixel. The same cam was totally outperformed by the 5DM3. I choosed the same lense on purpose and the same manufacturer (Canon). On your theory (was it yours?) the pure resolutionpower of a 7D (>40 MP calculated up to the 5D Sensor), should always be better than Cam with less MPixel; at least get their very own 18 MPixel covered.

Can you see the results? If not, one should better see the doctor.


Quote
Yes, let's compare.
7D - 12MP
5DIII - 21MP
5D - 13MP

7D pixels on a full-frame sensor (46MP) = (1.6^2)*7D = 1.6*1.6*12MP = 30.7MP.

Muahahahaaa... are you a politician? Turning existing results into the opposite? The 70-200 2.8 L IS II is even in it's centered "APS-C"-sweet spot not able to resolv the 18 MPixel of the 7D (that was the conclusion of the test) . Sampling the Resolution from the 7D up to a 40MPixel fullframe would have even poorer results as the corners of the lens are even weaker. It's an old truth that small sensors need better optics.

If you know a Nikon Pro with a D800/D810 ask him what lenses are able to resolve the full resolution of the cam. There are 3 known lenses from Nikon and 3-4 Zeiss. And we speak of 36MP, not 50.

38
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 28, 2014, 02:15:08 PM »
Quote
At diffraction limited fast apertures, lenses will always resolve more than the smallest physics-limited pixels, which is around 800nm (0.8um)...manufacturers are already wary of implementing 900nm pixel sizes...the smallest so far are 1000nm, which are already smaller than the 1100mm infrared limit for silicon based sensors.

This is just one barrier. It's not even an optical one (because we just speak about apertures). So the used glas has to be very clean and with each optical element you loose light, arrange new lightsplitting effects, reflections and so on. With the new apochromatic calculations, better with IS elements and 18 Elements in 12 Groups or more you get really a difficult formula. To get 50 MP on the chip itself was a difficult work 10 years back... that's not the problem anymore. The problem is to serve them...

Quote
Simple fact: smaller pixels resolve more detail. I think that has been demonstrated thoroughly well over the last decade, throughout the continual march towards ever smaller pixels paired with frequently improving optics. 

Theoretically you're right, but in real live this isn't true...

Quote
I believe under more ideal conditions, the 7D can realize about a 45% advantage over the 5D III

This have to be quite good conditions. Don't forget that the 7D uses the sweet spot of a fullframe-lens, to get the same resolution on the full sensorplane you should use mediumformat-lightcircles on fullframe. That's the reason why the Fuji GX680 performs excellent, it uses large format circles on medium format.

But to get back to the APS-C/7D Owners claiming more resolution. Let's check the facts. I will use DXO, but there are more sources on this. So screaming out "this is no test, I see more than the lab can say in numbers... here are at least measurements (still better facts than private opinions on boards, I think)

http://www.dxomark.com/Lenses/Canon/Canon-EF70-200mm-f28L-IS-II-USM-mounted-on-Canon-EOS-7D__619

Let's summarize it on 3 Bodies:



I choosed the 70-200 L IS II 2.8 as it is wellknown as one of the best performers out there, at least on Canonlenses. So the lense shouldn't be the weak point here. What can you see there? Even the old fullframe 5D outperformes the "18MP" 7D Body. The 5DM3 is way beyond the 12MP from the 7D. Nearly double. So how can this be? More pixels are theoretically better on resolution. I could explain it to you, but please entertain me with a counterproof ;)  But please more than "DXO is nothing to trust on".





39
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 27, 2014, 07:53:24 PM »
Quote
There is no problem of pixel size.

<physics>There is. </physics>

40
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 27, 2014, 04:09:39 PM »
Quote
I thought the Zeiss MF zealots claimed that AF was left off because it compromised image quality? I don't think you can just slot in AF motors/algorithms (or IS/VR for that matter) into an existing - supposedly near-perfect - MF design. Tech guys, right?

Right.

You can adjust metal tubes with very tight differences way better than an USM driven Autofocus, but hey facts don't count, just blame something in a strong and loud font, on a recent board and you will be heard ;)

41
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 27, 2014, 01:35:01 PM »
Quote
You know, if Nikon wanted to kill Canon tomorrow—and I mean completely end them, in all likelihood—all they would have to do is formally license their autofocus protocols to Zeiss.  Canon would suddenly be facing a company with better cameras and better lenses, and they'd have to either compete or die (or both).

Haha. You forgot one important fact in your equation. Nikon is based on photography, only. Canon is a huge company where photography is just a minor part of the income. That's also a reason why they don't focus on everybodys body-wishes all the time. And to be honest, Nikon already gave up at the sensor-war. They couldn't compete.

There is an old phrase...Why should the oak tree care if the pig is scratching on it's trunk? ;)

42
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 26, 2014, 01:09:06 PM »
Quote
That calculator is wrong witch is trivial to check when you realize that it means you can't get a sharp shot from any lens in a 70D or 7D2 at f/5.6 (which is obviously false).

I didn't say that you cant get a sharp shot beyond f5.6, it says it wont't get sharper until it runs into diffraction. So the resolution peaks @f5.6 if the lense is constructed well otherwise. Please go to a lensreview side of your choice, for example http://www.photozone.de/ , select any Canon APS-C lens and show me one example where you get better results on f8 or f11 than on the center of f5.6. 

On Fullframe you'll get into this 1-2 stops later (with both sensors having an comparable pixelpitch). This peak will go even lower to the max-aperture when you minimize the pixel more and more. But you don't have to believe on physics, just buy and belive in your mojo.

43
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 26, 2014, 08:12:22 AM »
Quote
Any larger format has less dof as you are using a longer lens for a given framing

But you can compensate the lower DOF easily with a smaller aperture. The resulting loss of light can be compensated with a higher ISO on the larger sensor.   I don't want to get with a mediumformat camera into the field hunting insects, but technically the smaller sensor gives you no advantage except of the size and weight from the body, build around ;)

Quote
I wonder about that. When you look at the comparision shots between the Canon 5DIII and Nikon D810 the difference in resolution and detail is so plain to see that its scary.

I don't speak about the difference between the 24MP and the 36MP, there is enough room for the Nikon to get the results you mentioned. But even the Nikon users know which lense is capable of the best results (ask D800/D810 owners). I speak about the problems of a real 50 MP Sensor, not 36 MP. 33-36 MP on Fullframe is (in my opinion) the upper spot, together with the best glass.    50 MP is quite another world.


44
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 26, 2014, 07:12:57 AM »
...and even if he got lenses with the best IQ and Resolution he would run into diffraction at F4 or more.

http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

So the lense should be tack sharp while shooting wide open @f2.8 or faster. This would be the next physical challenge ;)   In some studio environment this could be done theoretically, but the cost will explode.

There was and still is a good reason why photographers with needs >40MP always switch to medium format. It's about pixelsize and diffraction limits. If you push the small full frame sensor into it's limits you loose on every other aspect like ISO, Color Accuracy, Depth of Field (Diffraction). Is it worth it? Sometimes I don't want to be in the skin of the manufacturers. They have to please the customers, regardless of the sense of it  :-\

45
EOS Bodies / Re: Canon Confirms Development of High Megapixel Camera
« on: December 26, 2014, 06:37:44 AM »
Quote
I advise you to take DXO's equivalent megapixels rating for lenses the way you take campaign promises from politicians.  It's just about as accurate.

It's just a starting point, you can get similar results with imatest or dpreview. It's basically all about pixelsize/microns. The Diffraction Limited System [http://en.wikipedia.org/wiki/Diffraction-limited_system] gets you anyway ;)

Quote
Almost all Canon's current lenses would do just fine on a 50MP full frame sensor, and the better ones would excel.

Muahahaaa... no way.

Pages: 1 2 [3] 4 5 ... 16