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Messages - heptagon

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91
EOS Bodies / Re: Big Megapixel Talk [CR2]
« on: October 08, 2012, 03:11:18 PM »
Has Canon really been far even as decided to use even go want to do look more like about the new sensors yet?

92
EOS Bodies / Re: 46mp sensor useless for landscape?
« on: October 08, 2012, 03:07:48 PM »
Since you went and invoked Nyquist, :P I will ask - what is the physical phenomenon that we are sampling, and what property(ies) of that phenomenon provide the limits from which we determine the minimal frequency to adequately capture all information present, and the optimal oversampling frequency?
Now you got me thinking and crunching some quick numerics. The sinc function is bipolar while the optical intensity is only unipolar which is a basic difference. Usually functions are not bandwidth limited unlike ideal low pass functions like the sinc. Therefore if you want to caputre ALL information you need infinitely fine sampling.

However if we fourier transform the 1D-function of an airy disc and compare the energy content per frequency to the sinc-function with a same resolution (according to the Raileigh criterion) we need about double the sampling frequency to catch almost all energy. Therefore if we sample twice as fine as the resolution according to the Rayleigh criterion, we should be fine. This sampling rate is about 15% finer than for MTF50%. (At least for a series of points, i don't know if it also holds for lines.)

So using the MTF50% megapixel values as a measure sounds good. A problem, however, is that the pixels have area and are not ideal sampling points. Therefore we must compensate for that by making the pixel areas much smaller than the resolution. In order to not throw away so much light we will have to increase the resolution to a multiple the MTF50% values in order to get close to 90% of the signal energy available in the optical resolution.

93
EOS Bodies / Re: 46mp sensor useless for landscape?
« on: October 07, 2012, 04:18:50 PM »
Ok, I think this is too technical for me. So 46 MP is same as 36 MP for landscap?

No, 46 MP is higher resolution than 36 MP, for any application.

This is not ultimately true. According to the Nyquist theorem you get the whole information about a bandwidth limited signal if your samples are spaced close enough. Making more samples provides you with no new information. While the airy function is no sinc function, it is rather similar. So there is supposed to be a pixel spacing below which the quality gains become marginal. However i suspect this isn't the 50% contrast assumed in the calculations and if you consider the effects of the bayer pattern there should be a lot more pixels than we have today.

94
Software & Accessories / Re: Head for Manfrotto 055xprob
« on: October 06, 2012, 06:19:39 AM »
There's no perfect solution for all. Use a good gearhead for macro and landscape and another head for the rest. Else you will be unhappy in both situations.

95
EOS Bodies / Re: Looks like the 6D may not be so bad after all
« on: October 04, 2012, 02:54:12 AM »
I would rather have a good 1 point AF sensor than 9 bad ones. I would rather than 22 good mega pixels than 36 bad ones. I would rather have good menu system than sensor specs. I would rather have integrated WIFI and GPS units than not. I would rather have the EF lens support than not. I would rather have good customer support than not. I would rather have my Canon than not!

Actually I'd rather have a dozen good AF sensors instead of 9 mediocre ones and 36 million good pixels instead of 22 million mediocre ones. Where do i get that? Oh right, Nikon has it.

96
I've always thought the smartest thing for Canon to do would be to have official plug-ins for that sort of thing. Maybe provide your camera serial number, pay $25 and get a file that's either flashed into the camera or loaded to a special folder on your cards via DPP.

Even better an app store, it wouldn't be too hard for them to vet code to only use official APIs like Apple do so there's no chance of damage to the camera and have rules on how much CPU they can use etc. Bit of extra cash for Canon, a bit of extra cash for thousands of developers and the ability to get just about any feature you could dream of for end-users.

As for warranty / support just have a quick and official way to disable the plug-ins so they can quickly work out if problems are with the base firmware / camera or some sort of add-on.

The 6D has WiFi internet access. I'm waiting for the Canon App Store.

97
Instead of the 7D or the extender you might consider the 550D/T2i which has the same sensor. You get a slower framerate, no sealing, only center AF but essentially the same image quality. For occasional wildlife this might just be enough. And you have 2 cameras at hand. The 5D iii below 100mm and the crop camera above 112mm equivalent.

98
Canon General / Re: Lens Rebates Extended & 5D Mark II $400 Instant Rebate
« on: September 30, 2012, 12:24:15 PM »
I'm a bit confused; Is the 5D2 after rebate 1299$ or 1799$?

It's 1799 with the rebate.

Oh, i almost got my hypes up.

99
I also have heard that they do allow slr's but the white zooms are persona non grata.

Once again the Nikon-Crowd wins!

100
Canon General / Re: Lens Rebates Extended & 5D Mark II $400 Instant Rebate
« on: September 30, 2012, 07:37:01 AM »
I'm a bit confused; Is the 5D2 after rebate 1299$ or 1799$?

101
EOS Bodies / Re: 46.1mp Canon DSLR Previewed at PhotoPlus 2012? [CR1]
« on: September 26, 2012, 12:04:21 PM »
Canon's pricing strategy with 5DMKIII proved to be fundametally wrong, so I really hope they learned their lesson...
Just curios, did you see sales numbers?
Did you see them?

102
EOS Bodies / Re: More Big Megapixel Talk [CR1]
« on: September 25, 2012, 04:52:10 PM »
I'll believe it when i see it.

103
EOS Bodies / Re: Canon EOS 3D at 46.1mp Next Month? [CR1]
« on: September 25, 2012, 10:32:44 AM »
Please be sub-4000$.   :-\

lol.  Yeah, let's call it the 5.1D then.  With Canon's pricing strategy, $4,500 is almost a guarantee.  6D -> 5Dm3 -> 3D -> 1DX.  $4,500 fits in there nicely.

Does Canon even make a lens that can resolve 46MP?

Yep, The 100L & 135L are beast. Perhaps the New 24-70 II?

Any Canon Lens, that can take a 2x Converter with 18MP APS-C can not only resolve 46MP Full-Frame, but up to 120MP Full-Frame. Resolution-wise we're not done until reaching pixel sizes of about 0.25 micron.

104
EOS Bodies / Re: EOS 7D Mark II, EOS 70D & 700D in 2013? [CR1]
« on: September 23, 2012, 02:04:57 PM »
Let's hope they get their 80MP APS-C sensor out. That could be run at 20MP (2x2 downsample), 9MP (3x3 downsample) or 5MP (4x4 downsample) in low light mode. They have the technology, they just need to build it.

105
EOS Bodies / Re: 46.1mp Canon DSLR Previewed at PhotoPlus 2012? [CR1]
« on: September 22, 2012, 04:22:55 PM »
At least this promises to gain back some DR in print.

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