It's important to note a distinction.
The faster aperture tends to necessitate better glass, but the idea that only fast lenses have good glass would not necessarily be true. There are plenty of "slow" lenses that have very good optical quality.
It's important to note a distinction.
The faster aperture tends to necessitate better glass, but the idea that only fast lenses have good glass would not necessarily be true. There are plenty of "slow" lenses that have very good optical quality.