Fotodiox Macro Bellows for Sony A-Series Alpha Digital SLRs Fits Sony A100, A200, A230, A290, A300, A330, A350, A380 and A390 Best for extreme Macro photography, with MAX magnify ratio up to 8:1 (3:1 with 50mm Lens) Bellows extend from 40mm to 150mm with locking thumb screw. All metal construction for heavy duty use Built-in Tripod Socket for seamless sticking 24 Month Manufacture Warranty