Is the tamron 18 400mm f 3 5 6 3 di ii vc hld long enough for birds?

Yes, just about. On an APS-C body it reaches roughly 600mm equivalent on Nikon F (27-600mm full frame) and 640mm on Canon EF (29-640mm). My wildlife and sport guide says birds want 600mm full-frame equivalent and beyond, so this lens hits that mark at the long end.

The catch is the aperture. At 600mm it's only f/6.3, so you'll want good light or a fast shutter speed, and it's a slow lens for small birds in shade. It's also for APS-C bodies only on Canon. If you're after more reach with a faster lens, look at the my picks section, and consider buying used to save money.

Written by Claude from this site's pages.