Fuji makes some of the finest large format and scientific application lenses in the world, and Hasselblad claims to have specified the lenses for the H series cameras. H cameras use leaf shutter lenses. That means that the shutters are in the lenses rather than in the camera. This is a good news, bad news situation. It tends to make the lenses more expensive than they would be if they were on a camera with a focal plane shutter. Leaf shutter lenses can function at higher flash sync speeds. The H2D is a hybrid-system where you can use both a sensor in a digital back or the medium format Film Back HM 16-32 for 120/220 Film. Thus, the HC-lenses like the were made to cover the full 645-format. The HC 150 ( F/3.2 - F/45 ) is a stellar performer with (close to) no chromatic aberrations, very little distortion, and vignetting, and is plenty sharp enough edge-to-edge, even at F/11. What is the 500 rule? The wider your lens, the longer your shutter speed can be before the stars start to move. The equation divides 500 by the focal length of your lens. For example, with a 40mm focal length, you’ll have 12.5 seconds before the stars move. With a 150mm focal length, you’ll have 3.3 seconds before the stars move. No exposure correction or color balance compensation is required for exposures within a shutter speed range of 1/800 second to 1 second. However, for exposures of 4 seconds or longer, ‘reciprocity law failure’-related color balance and exposure compensations are required. The Hasselblad HC 150 lens on a Hasselblad H2 has a maximum shutter speed of 1/800. Flash can sync at the maximum shutter speed. Slow shutter speed up to 32 seconds.