The best replacement for full frame camera is crop sensor.

The best alternatives to full frame camera are rated as following:
★★★★★  crop sensor
★★★★  cropped frame
★★★  half frame
★★★  crop
★★★  non full frame

Your alternative for full frame camera is not listed? Suggest!
Speaking about full frame camera, one probably shouldn't forget about dx lens.

Other search terms related to full frame camera and their ratings are:
★★★★★ dx lens
You have in mind a companion for full frame camera and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of full frame camera in all years. Click on graph for more.
full frame camera
crop sensor
cropped frame