One lens one story #8
We want to talk a little more on the XF56mmF1.2 R.
The two ED lenses, these are not enough to explain the crisp and sharp image quality that the lens delivers.
Today, we want to look toward the back-end.The key is highlighted in the picture: the aspherical lens and the triplet lenses.These 4 elements are the focus lens group for XF56mm.
To say it as inner focus, the focus lens group is enormous, and just by looking at it, it makes you feel that the image quality is going to be great.On top of that, the 3 lenses are triplet lenses.
Generally speaking, there is a space between lenses.
And inevitably the air gets in the space, which will cause reflection on the surface of the lens. But in the case of triplet lenses, there isn’t any space in between.
It is tough against reflection, ghost and flare.
There is one another work against reflection, ghost, and flare: using less lenses.
Using aspherical lens instead of spherical lens is an good example.
As far as image quality is concerned, using large focus lens group with multiple number of elements will be the easier way to design the lens.
But then the AF speed and ghost are the price you have to pay. So here, we have come up with the idea of 1 aspherical lens with triplet lens.
As long as there is not white mass of light is shown, users are not concerned about ghost. But the reflection on the surface of the lens certainly degrades the sharpness and the contrast.
XF56mm is crisp and sharp because it works against ghost and eliminates it as much as possible.
Continue to read Episode 9
One lens one story – Episode 9: XF18mmF2 R