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Old 06-12-10, 02:20 PM
duncan22 duncan22 is offline
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What do these initials stand for ?
When looking at various lenses the range in usually followed by some initials ie. HSM (hypersonic motor) USM (ultra sonic motor) but what do things like,

DC OS, Di LD,DiVC USD stand for ?
Is there a website where all these initials can be interpreted ?

Thanks
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Old 06-12-10, 02:32 PM
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Cathus Cathus is offline
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DC is Sigma's derivation of lenses for cropped sensors, not sure what it stands for (DG is for full-frame cameras)

OS is Sigma's Optical Stabiliser

Di is Tamron's designation for digital camera lenses (Digital Integration) with LD - Low Dispersion glass
Di VC is one with Vibration Compensation or OS/IS

not sure about the other one
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Old 06-12-10, 04:30 PM
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chris-p chris-p is offline
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USD is Tamrons USM/AF-S thing - it's "Ultra Sonic Device", "ultra Sonic Drive" or similar...
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