The Mini View Camera Lens Board for M39 Lens allows the use of a wide variety of darkroom enlargement lenses for tilt-shift and macro photography. It is especially suitable for commercial still-life photography. Darkroom enlargement lenses are treasures for adapted photography. These lenses offer the following advantages: Flat-Field Structure with Ultra-High Resolution Enlargement lenses were originally used for darkroom printing,requiring uniform sharpness across the entire enlarged image without noticeable field curvature or astigmatism. Therefore,they employ symmetric or near-symmetric optical designs to ensure high resolution from the center to the edges. Under magnification and darkroom conditions,these lenses often achieve ≥100 lp/mm resolution within the aperture range of f/5.6–f/8; when adapted to digital cameras,they still deliver excellent detail at equivalent pixel densities. Multiple Groups of Low-Dispersion Glass for Accurate Color Reproduction Typical enlargement lenses use multiple pieces of low-dispersion glass,strictly correcting both axial and lateral chromatic aberrations to ensure smooth grayscale transitions and rich tonal ranges. The combination of flat-field design and anti-dispersion technology ensures balanced reproduction of all three primary color wavelengths,resulting in a pure and transparent image without noticeable color fringing or color shifts. Controllable Large Aperture Most models feature a maximum aperture of f/2.8–f/4,which not only meets the high light throughput requirements for darkroom enlargement but also provides a natural shallow depth of field and beautiful bokeh when used with digital cameras. They generally employ an infinitely variable aperture control,offering smooth and delicate manual adjustment. Low Distortion and Reduced Glare Originally used for precise film enlargement,these lenses are designed for point-to-point copying,resulting in almost no geometric distortion. Additionally,high-quality multi-coating effectively reduces flare and ghosting.