Could Canon release a smaller, lighter 600mm f/4 monster? Recent patents suggest they're mulling the idea.
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Multi-layer Diffractive Optical Element - Canon Europe
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Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens| Diffractive Optics| Mint Condition | eBay
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Canon EF 70-300mm f/4.5-5.6 DO IS USM Lens with Pro Filter (Certified Refurbished) - Walmart.com
Canon 70-300mm DO IS Review
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Canon 70-300mm DO IS Review
