when i use the original 6x7 roll film back of the linhof kardan color 4x5 inch, after the film process i see that the first frame that i shot is missing and there is one more unused available frame on the film, i load the film and turn it till the starting sign meets the red color starting point of the roll film back, i ve tried three films and in every time it is the same. what should i do?
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