The AE-1 had only one pointer needle used to indicate the light meter recommended f-stop, and neither a follower needle to indicate the actual lens set f-stop, nor plus/minus indicators for over/underexposure. The shutter-priority system of the AE-1 was more suited to sports action than to preserving depth-of-field, yet the 1/1000 s top speed of its horizontally traveling shutter limited its use for such activities. The battery door design was subject to frequent breakage, and over time owners have reported instances of shutter and mechanical gremlins, including mirror linkage wear (the "Canon squeal"). Canon's eventual abandonment of the FD lens mount for the EOS autofocus design also had an effect on prices for the AE-1 on the used market.