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Your existing ports will work with new Ikelite dSLR housings, but the rest of your equipment is not compatible with the Nikon D-40.
Digital cameras communicate much differently than old TTL film cameras, so the SubStrobe 150 circuitry cannot be used TTL with newer dSLR cameras. The best you could possibly do with the SubStrobe 150 is use it in some sort of manual set-up, but we do not currently offer any two-conductor sync cords that would accomplish this.
Also SubStrobe 150's are no longer serviceable by the factory (we couldn't purchase parts to repair if we tried), so they will eventually obsolete themselves... Also newer rechargeable batteries are much more powerful than they used to be, so repacking the battery packs yourself will likely blow the oscillator circuit in the strobe.
Cannot offer any suggestions on putting the D-40 in your old Pentax housing (and would not recommend doing so).
Cheers,
Jean / Ikelite
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