Pentax M42 42mm To PK K Mount Adapter Infinity Focus K-5 K-7 K20D

LENS - An optical element which converges or diverges light

Plastic - A generic term for a synthetic product used in the manufacture of products

SLR - Single Lens Reflex Camera - A type of semi automatic camera which uses a moving mirror allowing the photographer to see exactly the shot which is being taken

weight - A measure of the force applied on an object by gravity. Measured metric in grams and kilos or imperial in lbs and oz

Set - a group of items usually related to one another. Some objects cannot function without the complete set of items.

Weight - a measurement of how heavy an object appears due to the pull of gravity. For example the weight of an object on planet earth will be different to the weight of the object on the moon

Specification - A description of a product with the details of its attributes.

Diaphragm - An area of the body in which the lungs are.

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