What's best sigma or tamron for nikon?

What's best sigma or tamron for nikon?

Both produce good and bad. While many would tell you to stick with Nikon, you have to work out which lens you need and compare individual lenses on their own merit.

Work out what you need, find some suitable candidates and find a dealer who'll let you try them out.

The pro level lenses from Sigma and Tamron are great lenses, but their cheep stuff is what it is: cheep.

Also look at Tokina lenses- all their lenses are excellent quality

best, however, would be Nikon lenses