Using a Lens to reduce Moiré

Started Feb 9, 2013 | Discussions thread
Arky
Regular MemberPosts: 428Gear list
Like?
Re: Using a Lens to reduce Moiré
In reply to Tom Schum, Feb 10, 2013

Tom Schum wrote:

I wonder how much vibration occurs when ultrasonic sensor-shake cleaning is taking place? Is it in the unit pixel range? If so, it might be possible to test this idea with a firmware change to any camera that has the capability.

Another possible advantage would be that the area of coverage for each pixel would increase, that is, if the sensitive area of they typical pixel is 50% of the pitch, vibrating the sensor at one half pixel deviation would increase the area of coverage to almost 100%. This does not mean the sensor area would be any more sensitive though, just that it would have some sensitivity to all the light hitting that part of the sensor pitch instead of only maybe half that area.

If the ultrasonic frequency is high enough (30KHz?) there would always be several cycles during during any exposure. If the movement of the sensor exceeds 1/2 pixel, blurring might result of course.

-- hide signature --

Tom Schum

I believe the fill factor of modern sensors with micro lenses is approaching 90% or better so the sensor movement would probably need to be about 1 pixel wide. Probably about double that for a Bayer sensor. It would result in blurring but that's the purpose of AA filtering.

I think the ultrasonic cleaning only shakes the cover glass, not the entire sensor.

-Jerry

 Arky's gear list:Arky's gear list
Sigma SD1 Merrill Sigma DP1s Canon EOS-1D Mark II Canon EOS 50D Sigma SD14 +14 more
Reply   Reply with quote   Complain
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow