My take on the RF 800mm f/11 DO IS STM for birds: Canon EOS R Talk Forum: Digital Photography Review
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Canon RF 800mm Lens F11 IS STM, supertelelens voor de EOS R-serie (vaste brandpuntsafstand, 4-traps optische beeldstabilisator, 1260 g, compact), zwart : Amazon.nl: Elektronica
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The inspiration behind Canon's RF 600mm F11 and 800mm F11 super-tele lenses: Digital Photography Review
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An In-Depth Review of Canon's RF 600mm & 800mm f/11 IS STM Lenses — Aerial, Landscape, Real Estate & Architectural Photographer near Grand Rapids Michigan - DJZ Photography
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