You asked
Is the canon ef 35mm f 1 4l usm good on aps c?
Yes, on APS-C it's a good fit. Canon's APS-C bodies, including the Canon EOS 80D and Canon EOS 90D, take it, and it frames like a 56mm lens on full frame. That makes it a lovely short telephoto for portraits, and f/1.4 gives you a soft background. Our portraits guide says a 56mm f/1.2 to f/1.4 does the job of an 85mm on APS-C, so this lens fits that role.
Keep in mind that it's a full-frame lens, so on APS-C you're using the central part of the image circle. If you want something wider for everyday shooting, check the lenses guide and the sensor sizes page first.
Written by Claude from this site's pages.