Century 2x leaving purple streaks?

G

gerard

Member
Has anyone experienced this with the Century 2x on the HVX? I attached a screen grab of a clip using the (brand new) 2x zoomed all the way in and it consistently leaves purple streaks on the left side of the frame that are most noticeable on flesh tones.

Is it the lens? Is there anything I can do to remedy this problem? I want to have it figured out before its too late to exchange...

hvxbad.jpg
 
gerard, when I zoom into the image you posted, my observation is that the fringing is occurring along the edges where white colour (breaking wave/white wash, white wet-shirt, etc) meets the darker colours (surfers head, skin, boardshorts, and the green water/wave). The magenta fringing is where there is a white meeting an edge of another object that has red in it, namely skin tones, brown hair, black boardshort, right rail of the surfboard). On the other hand, while it is not as pronounced, where a white white meets another object that has green in it, there is the less apparent green fringing (see white wet-shirt meets the green water and wave, and the white wash of the wave meets the green water, there is a slight green fringing occurring, although it is more masked because the colour frequency is in the same spectrum, but it is there, just our perception and how we associate things masks it, imo.)

My take on this, chromatic abberation (CA) is occurring. I don't know if this would really help, but perhaps shoot much more flat/desaturated and then in post push the colours in the grade, however, I am not sure if this will really put you back at square one?

The footage is not exactly in focus, and I feel this is making the issue more pronounced. DV encoding at 4:1:1 or 4:2:0 (depending if NTSC/PAL DVX cam) is going to make this CA even more pronounced.

Just my observation, I may be totally wrong. Where did you shoot this footage?
 
This is chromatic abberation and will appear around the edges to some extent on inexpensive lens systems when pushed to the extremes (full wide, full zoom). It could be the fault of the Century adaptor or the HVX lens system. Of course, the point of extender is to go full zoom. If you can, back the zoom back a little and see if you still have this problem. It may also appear to a greater or lesser extent depending on the aperture of the lens at the time you shoot. There may be some room to play with the zoom and aperture to lessen the effect.
 
so this is what CA looks like... no bueno

This is most likely zoomed all the way in, I am going to go back and look at what some of my shots look like when Im not all the way zoomed in - even if it looks better I will still be disappointed to know that there is not anything i can do to fix this problem, like Joshua said, the point of this adaptor is to go full zoom..

So do you guys think that if I were to encode this in DV that the CA would be even worse?




Christopher,
This footage is from puerto rico
 
Chris, one question regarding the composition of the shot you posted. The surfer is way off to the left. Played on a TV, I believe half or more of him would not even be visible due to the overscan area. So, you might try actually playing this stuff back on a real TV or production monitor in overscan mode, and see if you notice the abberation. It could be that you can't see it at all on a monitor.
 
Joshua Provost said:
Chris, one question regarding the composition of the shot you posted. The surfer is way off to the left.
Click to expand...

thanks, thats just the first frame of a clip that pans over more - I just used it because the streaks are strongest at the very edge of the frame

Kind of disappointed with my lens - any other century 2x owners experience this?
 
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