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Can Pentax 6X7 LS lenses be used on 645 in LS mode?

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If I get the adapter to use 6x7 lenses on the Pentax 645, can leaf shutter lenses be used in leaf shutter mode?
 

klaus123

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My 90LS works on my 645- no problem because the original Pentax adapter transmits the aperture closing function
 
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Thanks Klaus.
 
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