There are multiple components to what we call flare. The TS-E 17 shows strong flare artifacts (‘ghosting’) with a bright light source in the frame or just outside of the frame. Most of my use of the lens is blue hour shooting in urban settings, and I always check the live preview for flare artifacts from streetlights just out of the frame, and block them with a flag or my hand. However, the veiling glare (diffuse loss of contrast from that bright light source) is very well controlled.You may have damaged the front element on your TSe 17L...sure I can make mine flare but it's probably the lowest amount of flare I've seen on a lens and very easy to fix. I find the TSe 17L remarkably low in flare considering how much the front element sticks out.
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