Canon EF 300mm f/4 L IS reducer/step down ring to f/6.3
Description
I designed this in order to use my Canon EF 300mm f/4 L IS Lens with Zwo Asi Cameras. Since the Zwos have relatively small pixels, i wanted to step down the lens in order to avoid fringing and other possible artifacts reveiled by the small pixel pitch if shot wide open. Usage: The lens it was made for has a sunhood. Just extend the hood and the ring should fall right into the hood. Please let me know any tips for improvement. Other step-down rings will be coming soon.
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