The recent discussion regarding aliasing made me think of novel hack idea. It would be great if the GH1 AF could be altered to consistently shift the focus off by a small amount so that the lens always slightly back or front focused. This slight mis-focus would act as an anti-alias filter. Ideally you could adjust the degree of misfocus within Ptool. (I think it is far to much to expect a menu item for this.)
Suggesting a hack for intentional mis-focus
- Thread starter wturber
- Start date
Interesting, Vitaliy mentioned he has some ideas about tapping into focus interface in this thread http://www.dvxuser.com/V6/showthread.php?t=2174675, so maybe something interesting will come of this.
cordvision
Well-known member
The problem hereby is that you might just shift you aliasing problem a little bit forward or backwards in the imaging plane. Also, depending on the scene, it might be very distracting because the part in focus is no longer your subject but something behind it, or in front of it. It's better to use one of those filters (don't know their name anymore, but I think barry tested them not too long ago), that blur the whole frame evenly....
Caprock filter. I'd be worried about shifting the focus. Compared to the 7D/5D I think the GH1 aliasing is relatively mild. It doesn't bother me, but it definitely stood out to my eyes on my 7D.
Those are good points.
The blur filters I've seen tend to add a "glow", so I haven't been too hot on that idea. But if there is a filter that doesn't "glow," that would be worth trying. I've thought about trying the old stretched stocking trick.
I find color moire' to be pretty significant at times. And at other times it is a complet non-issue.
I agree it is not as bad as what I've seen from DSLRs from other makers. But it isn't what it could or should be (theoretically at least, not necessarily from a product design and positioning standpoint) based on the sensor's sampling capabilities.
Justin Kuhn
Veteran
I'd love to see some research on this. Buying caprock filters for all of my lenses seems like an expensive PITA.
Are you seeing it in avchd 1080? Can you post a still? I haven't seen any color moire issues in avc.
I see it just about every time I shoot a table tennis match. The net pattern almost always shows a repeating color moire pattern - even though the net is typically a black or blue against a lighter blue. Further, the hard white line on the table edges are usually rendered near horizontal and they tend to alias fairly badly as well.
If you shoot a zone chart, the color moire becomes extremely obvious. So things like a high contrast patterned shirt or tie or possibly in building architecture present serious potential for moire.
This isn't a problem of significance for my recorded table tennis matches. But because I see it regularly, I'm very aware of the possibility of it showing up and this potential is exacerbated by the limited review and monitoring possibilities of the GH1.
I'll see if I can grab a still later tonight.
AVC or MJPEG? There's definitely color moire in mjpeg, but it's pretty minimal in avchd. I have not noticed it in any of my shots.