Petal Fringe

[Ian Brewster]

I am just starting to work with my new Sony A57 with Sony Zeiss 16-80mm zoom.
The following shot was at 1/200s, f4.5 (max for this lens), ISO 200, Focal length 80mm (35mm equiv 120mm), hand-held.
Spot focusing was used, focused on the very centre of the white pansy.

As shown in the enlarged section if=n #2, there is a distinct green fringing on the edge of the petal.

I have never noticed this to such an extent before (ie on my Sony DSCR1 with similar lens). But then I probably never took the same sort of shot with the same settings.

Any comment on causes, actions to take would be very welcome.

Thanks,

Ian

Pansy fringe problem 1.jpg Pansy fringe problem.jpg

[ameerat42]

Ian.
The petal looks a little soft focus-wise, or as if there was mist on the lens.

I note your exif says "F/45/10" (I suppose, f/4.5).

What does it do in shots like this at other apertures?
Am.

[Ian Brewster]

Thanks Am, The lens was clear but there could be a bit of movement. The 45/10 must be another Sony quirk - they seem to be good at that.

These are at 1/250, f8.0 ISO 800 and 1/500, f4.5 ISO 800: the fringing is not evident to me. I will have to take some more of the white flower; I guess its because of the white/green relationship? The focal length is 60mm (= 90mm) in these.

[ameerat42]

Certainly none evident in the 2nd lot, Ian. I am also thinking of the sharp white/dark boundary.
Am.