Tag Archives: EF 70–300mm f/4.5–5.6 DO IS USM

Canon Patent for EF 100-400mm f/4.5-5.6 DO Lens


Egami has discovered a new patent filed by Canon. The new patent describes diffractive optical (DO) lenses of the EF 100-400 f/4.5-5.6 DO and EF 70–300mm f/4.5–5.6 DO IS USM. Canon lenses which feature the diffractive optical (DO) are smaller and lighter compared to the same focal length lenses but the price becomes generally higher whenContinue Reading