sodotoguwangus
Well-known member
What the hell is it? It sounds like some kind of lense distortion or color problem, but I'm not sure . . .
chromatic aberration
- Thread starter sodotoguwangus
- Start date
Chromatic aberration is due to the change in permittivity (index of refraction) of glass with respect to the wavelength of light. The result is that you see colour separation in the image - which is particularly noticable around high-contrast edges. (Look for green and purple fringing on dark objects).
Here's a little site, from the first hit on Google when you ask the question.
http://www.yorku.ca/eye/chroaber.htm
Great if you're trying to do spectroscopy... lousy if you're trying to focus the light onto an itty bitty plane.
-Spiff
Here's a little site, from the first hit on Google when you ask the question.
http://www.yorku.ca/eye/chroaber.htm
Great if you're trying to do spectroscopy... lousy if you're trying to focus the light onto an itty bitty plane.
-Spiff
MattDavis
Well-known member
sodotoguwangus said:
IIRC, there were some posts that berated the stock JVC lens for having objectionable Chromatic Aberation. Whilst they are present in a subtle way, I thought I'd share the following grab with you from a recent Z1 shoot.
Note the green and magenta splurge of colour on the edges. On the left, it's pixel for pixel. Unretouched (but the Mac seems to wind the contrast up).
The HD100 lens may have its faults, but it's not quite this bad.
:cheesy:
Barry_Green
Moderator
That's a good example, Matt. But I disagree with your assertion about the HD100 not going to quite that level. I took down the page that showed the extreme chromatic aberrations because I wasn't the guy who shot the shots, and now that I have my own HD100 I figured I should be showing my own experience, not third-hand. But if you want to see examples of C.A. that would curl your toes... well... I'll just show one:
That's a pixel-for-pixel extraction.
The thing is, it appears that the aberration is exaggerated by the telephoto setting. And the JVC is capable of a lot more telephoto than the Z1 is (88mm vs. 54mm) so you'll see more aberration in long shots from the JVC. I don't know how they compare at equivalent focal lengths, that'd be something worth testing.
That's a pixel-for-pixel extraction.
The thing is, it appears that the aberration is exaggerated by the telephoto setting. And the JVC is capable of a lot more telephoto than the Z1 is (88mm vs. 54mm) so you'll see more aberration in long shots from the JVC. I don't know how they compare at equivalent focal lengths, that'd be something worth testing.