Is the canon ef 200 400mm f 4l is usm extender 1 4x worth it?

Yes, if you need f/4 reach for wildlife or sport and want image stabilisation. It's a professional wildlife zoom with a built-in 1.4x teleconverter. On full frame it covers 200-400mm as marked, and on APS-C it frames like 320-640mm.

For birds and sport, I'd pair it with a full-frame body such as the Canon EOS 5D Mark IV. On a budget, an APS-C body like the Canon EOS 90D gives you extra reach from the crop. Full frame earns its cost in low light, but for most wildlife work APS-C is plenty. See sensor sizes for that choice, and the wildlife and sport guide for how much reach you really need. Because long lenses hold their value, buying used is worth a look.

Written by Claude from this site's pages.