I have used a 135 mm Nikkor W lens to get 1:1 magnification on 4x5.
Originally Posted by fireboy
For 1:1 with a non-telephoto 135 mm lens, the object-to-lens distance equals the lens-to-film distance = twice focal length = 270 mm.
At 270 mm bellows draw, you must increase the exposure by x4 to compensate for the bellows extension.
This is essentially inverse-square law for the distance from lens to film: at large distance to the object, the bellows is approximately 135 mm.
At twice that, the light falls off by 2 squared = 4.
Did you mean that you can't get the camera closer to the object, or that this was the closest focusing distance with your maximum bellows extension with the 270 mm lens?
Last edited by TimFox; 10-17-2012 at 04:28 PM. Click to view previous post history.