Glad to hear you've found your lens, I'm sure will enjoy it, but pay heed to Ed's and Dave's comments about stability. I'm convinced that the difficulty stems from the mechanical shutter of the 645Z. When it opens, it it produses vibrations (rotation) that cause movement in the camera body if the body is not directly attached to the tripod. A Manfrotto long lens support is helpful here. It attaches to a tripod leg and the portrait plate of the 645Z, giving two attachment points and resistence to rotation around the tripod head mount. The shutter effect is also seen in the 400mm (645 FA). When used on a tripod, vibrations are reduced more by attaching the tripod at the body rather than at the lens. I did a test using the 600mm with a 645Z and a Fuji 50R. The Fuji used an EFSC to eliminate vibrations from the opening of the shutter. I've combined crops of a chair in the attached photos. Colors are as they come from ACR without modification. The Z image shows signs of camera movement. I did this test several times, the Fuji was always slightly sharper at the speeds used (1/40-1/100s). I did not use any addtional stabilization I would typically have for the 645Z in this test
Tom
Tom
Attachments
-
658.2 KB Views: 42
Last edited: