Fiber-optic maker

Corning

(GLW) - Get Report

was up 8.6% in early trading after saying late Wednesday that it expects third-quarter earnings of 34 to 35 cents, above the

TST Recommends

First Call/Thomson Financial

estimate of 29 cents and the year-ago figure of 19 cents. It's also raising its full-year earnings estimate to $1.15 to $1.17 a share.