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I believe both phones have great cameras. Looking at the specs, the ultra can produce a higher quality image and can zoom in much further. I personally have the Ultra for that zoom and its ability to take great pictures in the dark. However, If you're looking for a cheaper option the 23+ will also provide great photoghaphy.
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I don't think it is as bad as the ultra.. I have problems getting pictures to clear up all the time because my hand is a bit shaky.