500mm F4.5 EX DG HSM
Pentax K
Sigma 500mm F4.5 EX DG HSM

About

This is a full frame Pentax K mount lens introduced by Sigma 19 years ago. Its focal length is 500mm with an aperture of ƒ/4.5. You can find a review of it on DPReview.

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

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