Tokina mm f/28 vs Canon 700mm f/4 in Canon EF and EFS Lenses If i'm not mistaken, the tokina is made for digital cameras with cropped sensors only and will have too small of an image circle on full frame cameraManufacturer description The new Tokina ATX 535 PRO DX lens is a with a fast constant aperture of f/28 This lens gives digital photographers the similar to the industry standard telephoto zoom lens in 35mm camera terms but is much more compact and lightweightThis mm f/28, for instance, is a lot smaller than I thought it would be at 532 inches in length, weighing 186 lbs To get similar focal length coverage with a constant aperture on a fullframe Nikon camera, you'd need a lens like the $2400 Nikkor 700mm VRII, which is a whopping 81 inches long at a hefty 32 lbs

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