which brand would you suggest for close-up filters?
HOYA ProND16 & ProND32 Grad Filters Review - Christophe Anagnostopoulos
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HOYA | CLOSE-UP Lens Set II
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Hoya 77mm Close-Up Filter Set (+1 +2 +4) Multi Coated Diopters : Camera Lens Filter Sets : Electronics - Amazon.com
Cheap extreme macro magnification with achromat close up lenses
4 Close-Up Filters Kit (+1 +2 +4 +10) 55mm
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HOYA camera lens filter 49mm MACRO Close-up 49.0s | eBay
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Amazon.com : Hoya 1287 52 mm HMC Close-Up Filter Set - Black : Electronics
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HOYA STARSCAPE Filter Review - Christophe Anagnostopoulos
Hoya close-up set, +1, +2, +4 review
