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Messages - Lee Jay

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61
PowerShot / Re: Canon PowerShot G1 X II Final Specifications
« on: February 11, 2014, 10:59:33 AM »
This camera is horrendous looking but what is the sync speed?

I'm always amazed that people care about how a camera looks.  It doesn't take pictures of itself.

62
PowerShot / Re: Canon PowerShot G1 X II Final Specifications
« on: February 11, 2014, 10:58:22 AM »
So the same size sensor - 1.5" - but slightly lower resolution compared to the Mk I ?

Probably the same sensor with a slightly smaller imaging circle (something Panasonic used to advertise as a multi-aspect-ratio sensor, trying to claim a fault as a feature).

63
PowerShot / Re: Canon PowerShot G1 X II Final Specifications
« on: February 11, 2014, 10:20:02 AM »
I'd love to see the dimensions.  This camera is far more interesting to me than the G1X was.

64
PowerShot / Re: More Images of the PowerShot G1 X Mark II
« on: February 11, 2014, 10:04:14 AM »
Actually, how about this.

The original G1X sensor is 18.7mm x 14mm, which is 4:3 aspect ratio.  What if this one is 18.7mm x 12.5mm for 2:3 aspect ratio.  The horizontal crop factor is 36mm/18.7mm = 1.925.

1.925*12.5mm = 24mm
1.925*62.5mm = 120mm

So, I'm guessing the sensor is the same horizontal dimension as the G1X, but 3:2, making this camera specified at 24-120mm equivalent.

Someone on DPReview found a spec sheet that essentially says both are true - it's a 4:3 sensor but the lens image circle doesn't cover the whole thing.  So, in 3:2 mode, it's actually as I said above.  In 4:3 mode, it's narrower and taller.

This is one way to make the lens smaller and faster - give it a smaller image circle.

EDIT:  And now the final specs posted confirm this.

65
PowerShot / Re: More Images of the PowerShot G1 X Mark II
« on: February 11, 2014, 09:51:32 AM »
Actually, how about this.

The original G1X sensor is 18.7mm x 14mm, which is 4:3 aspect ratio.  What if this one is 18.7mm x 12.5mm for 2:3 aspect ratio.  The horizontal crop factor is 36mm/18.7mm = 1.925.

1.925*12.5mm = 24mm
1.925*62.5mm = 120mm

So, I'm guessing the sensor is the same horizontal dimension as the G1X, but 3:2, making this camera specified at 24-120mm equivalent.

66
PowerShot / Re: More Images of the PowerShot G1 X Mark II
« on: February 11, 2014, 09:44:49 AM »
The sensor is smaller than the original G1X, ....
I don't think so.
If the sensor is not smaller than the G1X original, so the lens is 12.5 mm ultra wide angle. That would be unlikely. I bet the sensor is 4/3 as Olympus and Panasonic.

The original sensor was 1.85 crop as specified by Canon.  If this one is the same, that's about 23mm at the wide end.  The S120 is 24mm, as are many other compacts.  I agree with what was said above - Canon will probably call this 24-120, just like the S120.

67
PowerShot / Re: More Images of the PowerShot G1 X Mark II
« on: February 11, 2014, 09:33:02 AM »
The sensor is smaller than the original G1X, ....

I don't think so.

68
PowerShot / Re: More Images of the PowerShot G1 X Mark II
« on: February 11, 2014, 09:18:52 AM »
So, in essence, it's a larger-sensor S120, right?

69
PowerShot / Re: More Product Confirmations for CP+
« on: February 10, 2014, 08:43:15 PM »
The SX50 is 215mm at f/6.5.  That's 215/6.5 = 33mm of aperture.

This specs for the SX70, assuming the same sensor size, are about 358mm at f/8, which is 358/8 = 44.8mm of aperture.

That's a pretty big increase in real, optical aperture.  I wonder if the lens and camera are even bigger yet.

70
PowerShot / Re: More Product Confirmations for CP+
« on: February 10, 2014, 08:34:40 PM »
We might also see an announcement for the PowerShot SX70 IS. It’ll come with a crazy zoom lens whenever it does arrive.  24-2000 f/3.7-8.0

f/8?  Hang on a second, let me do some math.

Let's guess that it has the 16MP 1/2.3" sensor.  That sensor has 1.33 micron pixels.

The spacial cutoff for f/8 for green light is 1/( 0.00055 * 8 ) = 227lp/mm.  Assuming we need 3 pixels per line pair, that turns into 1.47 microns per pixel.  So, this thing at f/8 would have an MTF of zero at the pixel level at the long end of the lens.

That's actually a good thing - it has enough focal length that the sensor isn't undersampling the optics.  Of course, it also means you're getting everything out of the optics that can be extracted, and that's assuming the optics have no aberrations.  If they do, you don't need this much focal length (or this many pixels) to get all the resolving power available.

71
PowerShot / Re: Updated PowerShot G1 X II Specs
« on: February 10, 2014, 02:47:26 PM »
What does "30 AF points" mean in the context of a mirrorless camera?

With an SLR, it's how many linear arrays are on the AF sensor (and their corresponding optics, of course), but if it's contrast-detect, you can define the area of detection anywhere, and if it's dual-pixel on-sensor PDAF, you've got millions of "AF points" which can be aggregated in a myriad of different ways.

So I'm back to what does "30 AF points" mean?

72
PowerShot / Re: More Product Confirmations for CP+
« on: February 10, 2014, 10:28:44 AM »
PowerShot SX700 HS

Didn't the SX600 HS come out about 5 weeks ago?

73
Canon General / Re: Canon PowerShot G1 X II Image
« on: February 07, 2014, 07:23:03 PM »
If the image is accurate it also appears to be missing:
- Exposure compensation dial (under the mode dial on the G1X)
- Front control wheel (under the shutter / zoom on the G1X)

Both of these changes seem strange for a 'G' series camera.

Phil.

Is it my imagination, or are there two control wheels on the lens?

74
Canon General / Re: Canon PowerShot G1 X II Image
« on: February 07, 2014, 07:19:44 PM »
$700 with, or without the EVF?

75
PowerShot / Re: What to Expect From Canon For CP+ Next Week
« on: February 07, 2014, 09:47:30 AM »

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