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Why Your Cheap Vintage Lens Is Blurry
By Lewis Whitter, wedding & events photographer (11+ years) · How we pickNotice how your charity shop lens is super soft in the corners? That's not a fault, it's optical physics. Older full-frame lenses were designed for thirty-five millimetre film.
When you slap that glass onto a modern digital crop-sensor body using a cheap adapter, you're actually cropping right into the centre of the image circle. But if you use a focal reducer, or speed booster, it condenses that full-frame image down.
That fixes the crop factor and sharpens up those mushy edges, while giving you an extra stop of light. Stop blaming the glass and check your adapter.
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