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Using IS For Action

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Is it worth investing more and buying a lens that has optical image stabilisation?

The variations in optical glass and in mounting lenses alters the polarisation of light. This produces these dazzling colours. Photograph/Jeff Barton
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Mosaic Lights

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Sharp Enough?

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Is there anyway of making sure that the sharpening is non-destructive?

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Flare Issues

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According to reviews, a new high-end lens I bought controls flare perfectly. But I see a lot of pattern flare and ghosting in the pictures I shoot against the light. Help.