Macro Bellows Focusing for Sony A-Series Alpha Digital SLRs
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Macro bellows work in the same way extension tubes do. They have an accordion-like body that allows for controllable extents of furthering the lens away from the sensor and in turn allowing you to move in closer to your subject. You simply open-up the below as much as you need to, and then lock that length up using a fastening lock that would ensure its stays in place.
Macro bellows widely range in prices with the more expensive ones providing great ease of use, and allowing for very fine adjustments for precise focusing.