Advice about stepping ring

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taxboy

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I currently use the Kase Magnetic filter system and their magnetic stepping rings for my 82mm filters. I'm about to purchase a Canon RF 16mm f2.8 whose filter size is 43mm. It appears that Kase do not manufacture a 43-82mm ring so I'm surmising I'll need to buy a stepping ring to attach the Kase magnetic holder ?

If so is there a recommended size I should get to avoid vignetting or other issues
 
Might be worth contacting THIS LOT. Their sister company is SRB Griturn who are an engineering company who might be able to make a single ring to mate the 43mm lens thread with the 82mm ring. Using a series of stepping rings may well introduce vignetting.
 
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