What camera sensor is better, full frame or APS-C?

Episode 954 (1:04:42)

David from Northridge, CA
Pentax K-5 16.3 MP Digital SLR

David has a Pentax K5 camera, which has an APS-C sensor. Should he get a full frame sensor instead?

APS-C sensors are usually used on less expensive DSLRs because of their smaller footprint. Even though the APS-C may have the same number of pixels as a comparable full frame sensor, that's the difference. A full frame sensor will have better low light sensitivity. If he doesn't notice the difference, then it really isn't an issue for David.

Chris Marquardt has chimed in from the chatroom to say that by and large, sensor size is a photo myth and he talks about that during his segment.