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Messages - marinien

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76
PowerShot Cameras / Re: Canon PowerShot G1 X Announced
« on: January 10, 2012, 06:25:31 AM »
I will not buy the G1 X. However, I am really interested in the mirrorless or rangefinder system. Wide-angles lenses on these systems are usually smaller and have less distortion than their SRL counterpart. The ideal set for me would be a rangefinder with wide-angles lenses and a DSLR for the rest. However, I do not know any real alternative to the Leica and I do not have the budget for that  :-\

77
PowerShot Cameras / Re: Canon PowerShot G1 X Announced
« on: January 10, 2012, 06:06:27 AM »
I think this camera will fail, the fuji X10 lens is a full stop faster at the wide end and 2 full stops faster at the long end! not to mention its smaller, and the fuji looks retro :P

I will try to use the explanations of Neuro on the comparison between the EF-S 17-55mm f/2.8 and the EF 24-105mm f/4:

The EF-S lens that has had some full frame users jealous for a while. 

Not the educated ones, who would know that the EF-S 17-55mm f/2.8 IS on a crop body is out-spec'd by the EF 24-105mm f/4L IS used on FF, since the FF-equivalent of 17-55mm f/2.8 is 27-88mm f/4.5 (becuase the crop factor affects aperture in terms of DoF for equivalent framing), and the 1-stop effect on shutter speed is more than compensated for bu the 1.33-stop improvement in ISO noise with the additional light gathering ability of a FF sensor).  So, the 24-105 on FF is wider, longer, and faster than the 17-55mm on crop, still has IS, and is weather-sealed with L-quality build to match.

The sensor sizes of the G1 X and the Fuji X10 are respectively 1.5" and 2/3", so the sensor of the G1 X is 2.25*2.25 larger than the X10's. The two cameras have the same FF-equivalent focal range. However, the maximum aperture range of the X10 is f/2.0-2.8. If we apply the crop factor of 2.25 to convert this to the equivalent aperture range of the 1.5" sensor, we obtain f/4.5-6.3. So the G1 X's lens on its 1.5" sensor is better than the X10's lens on its 2/3" sensor.


78
PowerShot Cameras / Re: *UPDATE 3* Canon PowerShot G1X Revealed
« on: January 05, 2012, 06:40:56 PM »
There's no doubt that it will have a 1/1.5" (smaller than Nikon 1) and not a 1.5" (bigger than Canon 1D) at this price point. Also Canon wouldn't dare create such a rift in their lineup, using a sensor that big in a "compact" body.

Still, the f/16 (minimum) aperture is interesting, usually compact don't go that small.

1/5" is bigger than the 1D series' sensor???

Ummmm...not quite.  What was stated was that 1.5" (not 1/5") is bigger than APS-H.  Decimal point, not fraction.  It's still not correct, but a 1.5" sensor would fall between 4/3" and APS-C in terms of size.  The fractional and larger inch designations are the outmoded nomenclature used for digicam/camcorder sensor sizes (which derives from vacuum tube diameters of the 50s era), and a 1.5" sensor would have approximately a 1" diagonal measure = 25.4 mm, and the diagonal measure of Canon's APS-C is 26.7mm.

Come on ... Have you read anything at all? Ah, I see, 1.9 (crop factor) is bigger than 1.3

It seems that someone wasn't reading, but that someone was you, not OvelhaMacho.   ::)

Neuro, I am disappointed  :-\. Of course I knew he meant decimal point and not fraction. I was just teasing him while saying 1.9 is bigger than 1.3. I said that he wasn't reading because you, among others, have said in this thread that a 1.5" sensor is smaller than APS-C and bigger than 4/3" sensor. Besides, you are the first in this thread who mentioned the 1.9 crop factor. See ... I was reading  ;)

79
PowerShot Cameras / Re: *UPDATE 3* Canon PowerShot G1X Revealed
« on: January 05, 2012, 06:13:40 PM »
There's no doubt that it will have a 1/1.5" (smaller than Nikon 1) and not a 1.5" (bigger than Canon 1D) at this price point. Also Canon wouldn't dare create such a rift in their lineup, using a sensor that big in a "compact" body.

Still, the f/16 (minimum) aperture is interesting, usually compact don't go that small.

1/5" is bigger than the 1D series' sensor??? Come on ... Have you read anything at all? Ah, I see, 1.9 (crop factor) is bigger than 1.3  8)

80
PowerShot Cameras / Re: *UPDATE* Canon PowerShot G1X Revealed
« on: January 05, 2012, 11:48:54 AM »
The reason why the sensor can't be 1.5" is the lens, not the price. The lens must cover the entire sensor (otherwise it's pointless to have a big sensor). Remember how big the 24-105 lens is? And that's an F4 even at 24mm.

I do not think that comparing lenses designed for (D)SLR and lenses designed for "mirrorless" system is appropriate (see "Lens Genealogy" by Roger Cicala). And I believe that that's why Neuro used the Olympus m43 kit lens for his example. Otherwise he would have used the 17-55 f/2.8 lens (shorter focal range, smaller apurture) instead.

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