Originally Posted by
maltfalc
i hate having to repeat myself. i AM taking focus shift into account! this is the same arrangement as a speed graphic. the original position of the fresnel was between the gg and lens, with the plain side of the fresnel facing the camera's lens and the lens side of the fresnel in direct contact with the frosted side of the gg. that means the fresnel won't shift the focus any more or less than a plain sheet of acrylic. if the gg and fresnel are the same thickness, you can place the ground glass with the plain side facing the camera lens and the frosted side against either side of the fresnel or without the fresnel at all. the glass of the gg will shift the focal plane the same amount as the acrylic of the fresnel did, or at least close enough to not be noticeable. the focal plane is the same, both physically and optically. there's no uncertainty here. and aftermarket fresnels have absolutely nothing to do with anything i said.
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