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Expert suggestion requested for focusing screen for Linhof Super Technika V


anindam_choudhury

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<p>The procedure for cleaning fresnels and ground glass is<br>

1. remove them from the camera holding them by their edges only<br>

2. under warm running water rinse both sides then apply a large drop of dish detergent to one side<br>

3. gently rub the entire surface with your finger tips, rinse, repeat on the other side. rub the ribbed side of a fresnel in direction of the ribs not across them.<br>

4. rinse thoroughly with water then in a weak photoflo solution and stand on edge and allow to air dry or towel dry with a lint free towel.<br>

5. reinstall with ground side of ground glass facing the lens.<br>

6. install the fresnel with the ribbed side facing the ground glass. install it first if it goes in front of the ground glass.</p>

<p>Works for any camera. Average increase in brightness is 1 to 2 stops depending on age and usage/storage conditions. Fine scratches may appear on the fresnel due to cleaning but varies from fresnel to fresnel.</p>

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