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Re: Thinking of buying an AC160, but worried about coma/aberration

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Stephen CryeRe: Thinking of buying an AC160, but worried about coma/aberration
by on Apr 15, 2012 at 4:35:34 pm

Thanks, Guy.

I hope you don't mind some follow-up. Trust me, I want to believe you! I'm itching to place the order.

Let's accept your sodium-vapor hypothesis. Can you explain why the reddish bloom is only on the top of the overexposed lights? Also, I see the same pattern of "red on top" even with overexposed items that are not lights, and the same "red on top" in out-of-focus images, such as in this video at about the 10 second mark. (Also notice the yellow on the bottom of the bokeh).






And, in this vid, I see the red-on-top in the out-of-focus overexposed shots of the full moon - reflected sunlight from the moon is pretty much the definition of pure white light:






I've also seen the same re-on-top problem in shots of leaf gap bokeh with sky behind the leaves, but I can't find that video right now.

But, on other videos, the bokeh looks perfectly color-symmetric, as in this vid at ~ 35 seconds:







And in this post, "iSi" includes a screen shot of the same reddish CA on top of the little ornamental architectural object. Now, please understand that this example shows a very minor amount of fringe; what worries me is that it is the same color as what I am seeing in the night lights shots:
http://www.isi-asia.net/download/A-resort-in-Pattaya-ca.jpg

I have read (and want to believe) that the AC160 has Chromatic Aberration Compensation (CAC) built in. Adam Wilt of ProvideoCoalition claims that it only works on lateral CA.

While I have your attention, any other observations you have about the AC160 would be great - things you like, things that bug you. I've heard complaints about the auto-focus, the lack of expanded focus and being forced to rely on Peaking, and the lack of magnification in the EVF eyepiece.

Thanks!

Steve

Win7 Pro X64 on Dell T3400, MultiTB SATA, 8GB RAM Vegas 10e (and 11) x64 DVDA 5.2(build 133) Sony HDR-CX550V


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