HDV compression artifacts and the bokah from 35mm lenses... at DVinfo.net

Lonnie Bell · June 13th, 2007, 06:42 AM

Hi all,
So, I'm watching A1 footage and other HDV postings, and is it just me, or do physics support my conclusion - but I think that HDV artifacting is less when 35mm adapters are used...

1. Is this because: if someone's using an adapter they're more apt to compose/light/pan/tilt the shot with more care?

2. Or is it the physics behind it... is the bokah (out of focus areas) produced, with it's blurry circular structures, easier on HDV, and perhaps producing less artifacting...

Besides the obvious depth of field, I think the bokah is a primary reason to use these adapters - as I hate compression artifacts.
Anyone else notice this and what's your take on this...

Thanks,
Lonnie

Jerome Marot · June 13th, 2007, 10:31 AM

The unsharp parts of the image have less high-frequency components and are thus easier to compress, leaving more bits for the sharp parts of the image.

So yes: images with shallow depth of field are easier to compress.

Lonnie Bell · June 13th, 2007, 10:49 AM

Jerome - you are one sharp noodle!
...and no, not just because you confirmed
my suspicions - Big Thanks!

Lonnie

June 13th, 2007, 06:42 AM	#1
Lonnie Bell Major Player Join Date: Mar 2006 Location: Las Vegas, NV United States Posts: 361	HDV compression artifacts and the bokah from 35mm lenses... Hi all, So, I'm watching A1 footage and other HDV postings, and is it just me, or do physics support my conclusion - but I think that HDV artifacting is less when 35mm adapters are used... 1. Is this because: if someone's using an adapter they're more apt to compose/light/pan/tilt the shot with more care? 2. Or is it the physics behind it... is the bokah (out of focus areas) produced, with it's blurry circular structures, easier on HDV, and perhaps producing less artifacting... Besides the obvious depth of field, I think the bokah is a primary reason to use these adapters - as I hate compression artifacts. Anyone else notice this and what's your take on this... Thanks, Lonnie __________________ Lonnie Bell mamas boy productions Las Vegas, NV

June 13th, 2007, 10:49 AM	#3
Lonnie Bell Major Player Join Date: Mar 2006 Location: Las Vegas, NV United States Posts: 361	Jerome - you are one sharp noodle! ...and no, not just because you confirmed my suspicions - Big Thanks! Lonnie __________________ Lonnie Bell mamas boy productions Las Vegas, NV

June 13th, 2007, 10:31 AM	#2
Jerome Marot Regular Crew Join Date: Jul 2006 Location: Munich (Germany) Posts: 107 Images: 4	The unsharp parts of the image have less high-frequency components and are thus easier to compress, leaving more bits for the sharp parts of the image. So yes: images with shallow depth of field are easier to compress.