I haven't used these adapters personally, but haven't heard anything good about them that I remember. Might be OK if you just want to see if you like WA though. Something I wish I'd done before I bought the Siggy 10-20, only to find I hate using anything under 50mm
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"I meant," said Ipslore bitterly, "what is there in this world that truly makes living worthwhile?"
Death thought about it.
"Cats," he said eventually. "Cats are nice."