Good things come in small sizes.
In terms of basic operations both the cameras startup in just over a second, ready to snap. You won’t be experiencing much shutter lag either, especially if the subject matter has been pre-focused before taking the shot. The PowerShot A3100 IS does feel a little slower compared to the IXUS 105 between successive shots, probably due to the old DIGIC III processor inside. Sadly, this disadvantage carries over in the pictures as well. While both cameras take great pictures for a point and shoot, the IXUS 105 edges over the PowerShot A3100 IS in terms of better color reproduction and more clarity in dimly lit areas. The flipside to the coin is that the IXUS 105 is also very trigger-happy when it comes to jumping the ISO levels, resulting in ever so slightly noisier pictures. Of course, the graininess will not be noticed on regular 4×6 or 5×7 sized printouts.
Our only other issue with the IXUS 105 is that during playback mode, the lens closes back inside the camera body, and to start taking pictures again, you’ll have to turn the camera off and on again. Beyond that, the IXUS 105 is faster than the PowerShot A3100 IS with better pictures (sharper at the edges and more natural colours). Whether it is worth the extra AED 100 depends on your average usage and desired results. At the end of the day, both the IXUS 105 and PowerShot A3100 IS are very capable offerings by Canon for the point and shoot market.
All sample images have been shot in Auto mode and image size reduced by 50%, no other alterations were done.
Canon IXUS 105 sample shots:
Canon PowerShot A3100 IS sample shots: