The Xit Pro Series auto-focus macro extension tube set is specifically designed for Sony DSLR and SLR cameras. It includes 3 tubes which can be used individually, or in combination to achieve the desired magnification. It is designed with all the proper circuitry and mechanical coupling to maintain auto-focus and TTL exposure with most Sony mount lenses. Perfect for flowers, insects, coins, stamps, and any close-up shots you want to take. It includes 13mm, 20mm & 36mm tubes. 2 year warranty