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Some Canon lenses like the EF 17-40mm L use "replica" aspherical elements... Replica aspherical lens elements are produced by using an aspherical surface mold
by foobar1962 3y ago
Some Canon lenses like the EF 17-40mm L use "replica" aspherical elements...
Replica aspherical lens elements are produced by using an aspherical surface mold and ultraviolet-light-hardening resin to form an aspherical surface layer on a spherical glass lens.
- kridsdale1 3y agoIsn’t that a super budget lens? How’s the pixel peeper performance?
- matsur 3y ago"L" has a red ring and everything!
- nayuki 3y agoI owned the EF 17-40mm/4 years ago and did not like it, other than the affordable price. The corner sharpness was poor. Plus it lacked image stabilization. I was so happy when I upgraded to the EF 16-35mm/4 IS and got a noticeable boost in sharpness, and I could shoot with longer shutter speeds and lower ISO in indoor/night situations.
- foobar1962 3y agoNot a budget lens, but it was extremely good value for money at the time and had excellent image quality for an ultra-wide zoom. Later lenses were better...