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06-25-2013, 12:36 AM   #1
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ED lens

Being a bit of a newby I would like to know what the ED signifies in a lens description please?

For example
PENTAX SMC DA 55-300mm f/4.0-5.8 ED Lens

Thanks

06-25-2013, 12:49 AM   #2
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06-25-2013, 12:56 AM   #3
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Thanks i83N
06-25-2013, 01:35 AM   #4
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You can find a brief overview of Pentax lens terminology here:

Pentax Lens Terminology

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