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  3. Pentax 100mm f/4 smc PENTAX Bellows Lens for K-Mount {52} For Use with Bellows/Extension Tube

* Item pictured for illustrative purposes only, actual item not pictured. See ‘Notes’ next to grade for included items.

Pentax 100mm f/4 smc PENTAX Bellows Lens for K-Mount {52} For Use with Bellows/Extension Tube

Model #241952
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* Item pictured for illustrative purposes only, actual item not pictured. See ‘Notes’ next to grade for included items.

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A "bellows" lens has no focusing ring on the lens. It must me used with an extension tube or a bellows. The bellows will allow focusing to infinity and can sometime allow 3:1 ratio. That means 3 times normal size to the film or sensor. 

Brand Name Pentax
Filter Size 52mm
Focus Type Manual focus (only)
Lens Mount Pentax K (SMC, SMC-M)
Lens Type Short Tele / Portrait, Telephoto / Long
Max Focal Length 100mm
Min Focal Length 100mm