APO Sironar Digital 90mm f5.6 Lens and Copal 0 Lens Board - 67mm filter mount #21545
This is a 90mm f/5.6 Apochromatic Sironar Lens in a Copal #0 Shutter, designed for use with a digital back on your large format camera. Its apochromatic design reduces color aberration and each element is constructed to eliminate color "fringing" in the digital image. Due to the relatively small formats (higher diffraction) and the high light requirements of the CCD image sensor, f/8 and f/11 are the ideal working apertures. Accepts any brand of 67mm threaded filter.