smc DA* 50-135mm F2.8 ED (IF) SDM
Pentax K
Pentax smc DA* 50-135mm F2.8 ED (IF) SDM

About

This is a full frame Pentax K mount lens introduced by Pentax 17 years ago. Its focal range is 50135mm with an aperture of ƒ/2.8. You can find a review of it on DPReview.

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Used
Starting at $369
KEH is American and has slightly higher grading standards, while MPB is originally from the UK. Both are global leaders in used lens trading.