An Arca-Swiss can easily perform this feat.
An Arca-Swiss can easily perform this feat.
Sorry. But someone explained it correctly above. For life-size reproduction twice the focal length in extension must be available. So 150mm needs 300mm(12") minimum. By the way the distance from the shutter at 1:1 will also be 300mm to the object focused, with a 150mm lens. Also the compensation at 1:1 with any lens is always 2 stops. At 225 extension, with a 150mm lens, you will be at 1/2 life-size and a 1 stop compensation will be required for correct exposure.
Hope this helps.
Rod
Almost any large format camera you care to think of has a rough focusing set up and a fine focusing set up. I have a Wista 45DX. For a landscape, you set it up by sliding the front standard out the bed until you get to infinity, then you tighten the standard down and use the focusing knobs. If you want to get really close to something you'd have to loosen the standard and slide it all the way out, then use the focusing rack to get closer still. I can't slide out to infinity and get full bellows extension on the focusing rack. If you think of extension tubes on a 35mm camera, they are working in the same principle.
Your problem has more todo with operator lack of knowledge,than lens fault.
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