It has beautiful bokeh at f1.2. On top of that it is one of Nikon's sharpest 50mm at f2. The only problem with this lense is the comma, so it is useless for those ultra low light nigh shots.
Can you explain that a bit further please?
I suspect he meant "chromatic aberration" that tends to create colorful halo around lights at night.
Coma and chromatic aberration are somehow different things. Chromatic aberration, as you say, creates a colourful halo. This happens because the diffraction coefficient depends on wavelength, so different colours focus in different places.I suspect he meant "chromatic aberration" that tends to create colorful halo around lights at night.
Coma and chromatic aberration are somehow different things. Chromatic aberration, as you say, creates a colourful halo. This happens because the diffraction coefficient depends on wavelength, so different colours focus in different places.
Coma usually refers to a distortion which affects off-axis point sources (stars or street lights), which become blurred and elongated (the name refers to a nebula around the nucleus of a comet, hence it is a coma, not comma). This is because the lens does not focus perfectly at large off-axis angles. Sometimes comatic aberration depends on the wavelength and then it can be considered a type of chromatic aberration. But usually coma refers to a different type of distortion than chromatic aberration.
Coma can be a big problem in astrophotography, smearing images of stars. Also in nightscapes, where remote street lights are no longer points, but little "commas".
Coma and chromatic aberration are somehow different things. Chromatic aberration, as you say, creates a colourful halo. This happens because the diffraction coefficient depends on wavelength, so different colours focus in different places.
Coma usually refers to a distortion which affects off-axis point sources (stars or street lights), which become blurred and elongated (the name refers to a nebula around the nucleus of a comet, hence it is a coma, not comma). This is because the lens does not focus perfectly at large off-axis angles. Sometimes comatic aberration depends on the wavelength and then it can be considered a type of chromatic aberration. But usually coma refers to a different type of distortion than chromatic aberration.
Coma can be a big problem in astrophotography, smearing images of stars. Also in nightscapes, where remote street lights are no longer points, but little "commas".
Comma is the phenomenon where point sources of light are rendered as "comma", that is point + a tail. Lenses meant for really low light are designed with minimal comma, so that point sources remain points. Lenses with large aperture are designed for excellent OOF (bokeh). They may or may not be designed for low light. The Nikon and Leica Noct series is designed for low light, where as the Nikon 50mm F1.2 is not.
Chromatic aberration (CA) is when all the colours do not focus at a single point. This gives rise to colored fringes at the edges (it is always there but gets masked in the main body). Chromatic aberration also affects the diffraction limit, as at high F stops with fine detail, CA will create fringes, reducing resolution. That is why APO lenses tend to be sharper at higher F stops, as there is no CA fringing. Another way of looking at it is that APO lenses can be used at much higher stops before diffraction softens the image up.
Thanks bud. I appreciate your input but if that's the case with 50 1.2 in terms of comma then where is the use for their 1.2 speed?
Thanks bud. I appreciate your input but if that's the case with 50 1.2 in terms of comma then where is the use for their 1.2 speed?
Daylight portraits.
At F1.2 you do not really need a flash, even at ISO 100.Then I would think with flash or strobes, too, providing the background isn't thrown into too much darkness, yes @aroy?
At F1.2 you do not really need a flash, even at ISO 100.
When taking indoor portraits with either strobe, flash, or constant lighting to control highlights and shadows, I could see a lens being used at f/1.2. My question is if a backdrop light isn't used and the backdrop or background fades into darkness, how would that affect comma or chromatic aberration?