December 20, 2014, 11:43:42 AM

Author Topic: 1DX vs 1D IV ??  (Read 11721 times)

Crapking

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Re: 1DX vs 1D IV ??
« Reply #30 on: January 23, 2012, 07:39:33 AM »
As the OP, I again thank you for your insights - I didn't have enough time last weekend to fully explore the AF of the 1d and (mistakenly) undervalued it c/w my 7D. I trust the additional time I will have with it (now that I hit the "Proceed to Checkout" button  :) ), will allow me to better compare all of these options.  I also trust the incremental ISO / noise performance over the 7D will allow me the freedom to push my low light vision.  Ultimately, as so many others have said, why wait?  It is a great camera and I know I will be using it ALOT between now and whenever I might be able to get my hands on a 1Dx (as I have been unable to secure a pre-order). Again, thanks for helping me decide.
1Dx, 1DIV, 5D3, 7DII, (Sigma 15 FE)
16-35/2.8; 24-70/2.8 II; 70-200/2.8 II, 100-400L
35/1.4, 40/2.8; 50/1.2, 85/1.2, 135/2; 200/2

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Re: 1DX vs 1D IV ??
« Reply #30 on: January 23, 2012, 07:39:33 AM »

neuroanatomist

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Re: 1DX vs 1D IV ??
« Reply #31 on: January 23, 2012, 10:27:42 AM »
It would be interesting to know how people use the various AF options. I would be interested to know if the AF point on the 1D4 are the same size as the 7D or whether, as I suspect, they are smaller.

They are the same size, which makes perfect sense from an optics standpoint.  Canon uses the same 48-bit lines for their sensors (sometimes in offset pairs they call 'dual zig zag'), and an f/2.8 baseline is the same physical size regardless of sensor format.  If you take an image of a 1D IV AF sensor and superimpose it on an image of the 7D sensor, you can rotate one of them 45 degrees and see that the spacing of the f/2.8 lines is the same for both.  That's physics. 

The exception is the center point on some 1-series bodies, where 96-bit lines are used (same length, twice the density, which is how they manage accuracy equivalent to Canon's normal f/2.8 and f/5.6 at f/4 and f/8, respectively). 

Sidebar: that 'trick' may be exactly how Nikon is offering many f/8 points on the D4 - they have the lines spaced at f/8 spacing, but gave them double density to make up for the shorter baseline. 
EOS 1D X, EOS M, and lots of lenses
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briansquibb

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Re: 1DX vs 1D IV ??
« Reply #32 on: January 23, 2012, 10:43:20 AM »
Cheers neuro  ;D ;D ;D

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Re: 1DX vs 1D IV ??
« Reply #32 on: January 23, 2012, 10:43:20 AM »