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Forum: Photographic Technique
11-28-2007, 09:43 AM
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There are 4 different types of extension tubes available to my knowledge, these are:
- K mount full manual tubes with no apature coupling between the lens and camera. These will work in stopped down metering mode only, on a DSLR or film cameras
- K mount automatic extension tubes with both the apature coupling and activation levers installed, these will work in manual exposure mode on DSLRs and Apature priority mode on most film bodies that can use the apature ring (i.e. excluding latest film cameras). On DSLRs in AV mode they will only shoot wide open
- KA mount tubes with apature couplings AND the electrical contacts for full apature control on all cameras. These will work with KA mount and newer lenses to give Av mode esposure control on DSLRs
- KAF mount tubes that do all of the above plus have the drive for autofocus lenses. These will work with a DSLR to what ever the capability of the prime lens is.
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