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Your likely to need a coupling ring to allow the classic K lenses to fit on a DSLR, the disadvantage is obviously auto focus and will not work as one the DSLR this works by a motorised drive which the classic lens are not equipped with.
However in terms of picture quality and performance you should not have any issues, though the winding mechanism will still pose you problem if not repaired.
Please restate your simple question otherwise please see above response.
Understood the DSLR listed (SF7, K7 and K70) uses the K fitting so your old lenses will connect you just need to make sure you set the DSLR to manual mode, and you do not need to use a adaptor ring.