When I tilt a very wide angle lens to obtain near-far focus (either a 58 mm or 6 5 mm in 6 cm x 9cm format; roughly equivalent to 75 mm or 90 mm in 4 x 5), the i mage is sometimes soft in the sides of the background, but still relatively shar p in the center of the background. What is causing this? Too much or too littl e tilt? Curl in the roll film back? Thanks.
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