5 stars for doing what no other camera app can
This app definitely needs to be in the toolbox of any budding iPhotographer. It can capture more detail in general than the built-in camera app and is better at handling poor lighting conditions. This is not to say the it excels in all situations.
Because it takes several seconds to capture an image (and several more to process it for viewing), the subject must be absolutely still. It also helps to have a steady hand (though CC can compensate for jitter to some extent), particularly if the subject is close to you. Since the camera operates in video mode, the field of view will be narrower, though in practice, I have not found this to be much of a limitation, as the iPhones FOV tends to be a little on the wide side to begin with.
But when its on, its on! I have taken some photos with CC on an iPhone 5 that rival what I could manage with my Canon. I even took some photos of the moon once by holding the phone up to the eyepiece of a backyard telescope and they were not the blurry mess I was fully expecting. :)
Since these limitations are based on the hardware (and perhaps the operating system to some extent), I see no reason not to give 5 stars to the developer of this app who managed to squeeze the most he could out of a phone camera. Nice work!
Update: The app appears to crash on launch under iOS 8. I hope this can be fixed. Im missing it already...
Update: The latest update appears to address the iOS 8 incompatibility! Thank you!
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Cortex Camera, v1.91