Efs 1755mm f2.8 IS isnt up to L lens quality
Imagine they make this 1755mm lens as an L lens quality , how much would it cost more? I rather they create more consumer grade lens so we no need to get everything L , not every user need the quality of L, we only need the optics of L with consumer price.
I stil happy with my 1755 , I once think to sell this lens and fund for primes, but god bless me I didnt because nothing beat the versatile, the af speed, the IS, the constant aperture of this lens
If build quality is ur main point, go for L , skip the non L lenses
Canon 60D Gripped | Canon 17-55mm f2.8 IS USM | Canon 85mm f1.8 USM | Canon 580exII