The Aksen 45mm f/2.8 1-5X Ultra Macro APO delivers precision macro photography with a revolutionary parfocal zoom design. Magnify from 1–5X without refocusing and the lens maintains sharp focus as you zoom, eliminating constant readjustment. Fixed working distances of 40.35mm keep your setup stable, your workflow uninterrupted, and your subject safe. Internal zoom mechanism keeps the barrel stationary, preserving flash diffusion setups. Professional-grade optics for macro work that demands both speed and precision.