Sensor & ISO
Canon G15 uses newly developed CMOS sensor, G15 uses a 12-bit converter to process the output of the CMOS sensor, resulting in true color, smooth tonal transitions and natural gradations. The Standard ISO range of Canon G15 is up to 12800, G12 was limited to 3200.
the PowerShot G15′s shooting time lag is dramatically reduced to only 0.22 seconds.
Canon G15 comes with a new bright Lens, you get F1.8 at wide-end and F2.8 at tele-end, The large f/1.8–2.8 aperture allows you to achieve shallow depth-of-field for creating portraits with beautiful, soft background blur, and incomparable Canon optical technology delivers a high performance lens enabling incredible images, even in low light.
Canon G15 have advance Hybrid IS compared to G12, the G15 have a Intelligent IS system that detect the type of scene and activates required IS mode, For stills, the system automatically selects among Normal, Panning, Macro (Hybrid) and Tripod IS modes. When shooting video, the system automatically selects among Dynamic, Powered, Macro and Tripod IS modes.
* No IS was available on G12 during video shooting
With Canon G12, you cannot use optical zoom during the video shooting and only HD Video recording option was available, with Canon G15 you can record Full HD videos and You’re free to use the full range of the zoom in movie mode, and sound is recorded in stereo.
Canon G15 features Fixed 3 inch high resolution display, Canon G12 comes with vari-angle 2.8 inch display unit, I prefer Canon G12 display.
Canon G15 available at $499 and Canon G12 available at $379, you save $120 if you purchase canon G12.
Conclusion: We highly recommend you to buy Canon G15
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