View Full Version : High frequency flicker in DV


Alvise Tedesco
September 30th, 2007, 06:09 PM
Hi all.
Testing DV 25f on XH-A1 vs. my DVXa.
I see a very troublesome flickering on fine straight lines (vertical, horizontal it doesn't matter). Lowering sharpness a lot does reduce it, but then I prefer my DVX, also with his noise on dark areas.
Any suggestion? Coring? H detail? V detail?
I see nobody mention this problem. Is it because it isn't an issue when shooting hdv?
Thanks

Eric Weiss
September 30th, 2007, 06:30 PM
Yes, I find that same issue as well in DV. The A1 is made for HDV.
Shoot in HDV and downconvert to SD for the best results.

Bill Ravens
September 30th, 2007, 09:59 PM
try encoding to a progressive(deinterlaced) output

Simon P Lowe
October 1st, 2007, 05:31 AM
Hello, I think I can help.
This camera does not work at its best when shooting in SD. This is because the lens and imaging sensors are designed for HD pictures, these high frequencies need to be suppressed before down conversion. The camera uses simple inadequate downconversion filtering which you see as aliasing in your picture.
The problem can be resolved by fitting an optical diffuser on the lens. Try a 1/4 Black Promist or similiar.
Simon.

Alvise Tedesco
October 1st, 2007, 06:19 AM
Unfortunately a ProMist isn't effective, I think. I already mounted my M2 adapter and it doesn't solve the problem.
Thanks for answering