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Another thing to consider with the older manual focus lenses is the fact that most modern macro lenses have no aperture ring. This means that should you wish to increase magnification using extension tubes, you have to buy the type with the electrical contacts so that body and lens can still communicate. Without this you can't stop the lens down for optimum sharpness (usually around f/11)
The same applies to using bellows. You'll be unable to use a gelded lens on bellows without them having the electrical contacts, which will run you about 500 quid or more, for the ones
I've been able to find. This is something I overlooked too when I sold my old Tamron SP90 and will have to spend another 130 quid on Kenko auto extension tubes.
Food for thought anyway
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