Another Focusing Issue - Snap Zooms at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Sony XDCAM EX Pro Handhelds
Sony PMW-300, PXW-X200, PXW-X180 (back to EX3 & EX1) recording to SxS flash memory.


Reply
 
Thread Tools Search this Thread
Old May 23rd, 2010, 11:48 AM   #1
Regular Crew
 
Join Date: Aug 2008
Location: Providence, RI
Posts: 53
Another Focusing Issue - Snap Zooms

I have another focusing problem with my camera. I had the dreaded backfocus issue, my EX3 has since been brought in and fixed (given a new lens which fixed the problem). Now I am having a different focusing issue. When I am doing snap zooms I go in on the object focus, pull out, and then when I go back in on the object it is drastically out of focus again. Tried powering down camera but having same problem. Any ideas. thanks
Matt Sturns is offline   Reply With Quote
Old May 24th, 2010, 02:14 AM   #2
Major Player
 
Join Date: Jun 2006
Location: Studio Alnitak, Melbourne, Victoria, Australia
Posts: 640
Images: 3
Do you have the lens in AF or MF setting? In snap zoom will hold focus in MF but not in AF
Serena Steuart is offline   Reply With Quote
Old May 24th, 2010, 04:30 AM   #3
Major Player
 
Join Date: Jul 2003
Location: Leeds, UK
Posts: 660
Images: 10
Seconding what Serana suggests.

Leaving the lens in Full MF on my EX1 is the only way to get the zoom effect to work properly, I can see the image going soft in the middle of the zoom at medium speeds so I have to do it quite fast or much slower.

But it's effective enough for my needs: Here's an advert going to air today in the UK: http://www.duncancraig.co.uk/Burgess...3-040-h264.mov (the zoom out is the penultimate shot)
__________________
FCPX/LS300/EX1/FS100/GoPro/Vinten/HotHead/Jib/Track/Dedos/Lightstorm/Coollights
Duncan Craig is offline   Reply With Quote
Old May 24th, 2010, 09:08 AM   #4
Regular Crew
 
Join Date: Aug 2008
Location: Providence, RI
Posts: 53
Thanks guys that seemed to do the trick. Stupid question what is the difference between the the different focusing modes. On the lens you can pull out for different focusing modes? What does pulling out the lens do? There is an asterisk in my viewfinder, thanks for the help :)

Last edited by Matt Sturns; May 24th, 2010 at 09:09 AM. Reason: change
Matt Sturns is offline   Reply With Quote
Old May 24th, 2010, 10:34 AM   #5
Major Player
 
Join Date: Jun 2004
Location: Oxfordshire, UK
Posts: 416
Quote:
Originally Posted by Duncan Craig View Post
.....Here's an advert going to air today in the UK: http://www.duncancraig.co.uk/Burgess...3-040-h264.mov (the zoom out is the penultimate shot)
Duncan, if I may go off-topic briefly: can I ask what you use for your H.264 encoding? It looks very good for a 3.5Mbps stream at widescreen PAL-SD resolution.
__________________
Martin at HeadSpin HD on Blu-ray
Martin Mayer is offline   Reply With Quote
Old May 24th, 2010, 11:35 AM   #6
Major Player
 
Join Date: Jul 2003
Location: Leeds, UK
Posts: 660
Images: 10
Martin, it's nothing special.

I'm on Mac OSX using compressor and had a play for a few minutes with the basic built in h264 settings, making the video 1024x576 (custom 16:9 size). Some of the spec is here:

Name: YouTube H264
Description: QuickTime H.264 video with PCM audio at 48 kHz. Settings based off the source resolution and frame-rate.
File Extension: mov
Estimated file size: unknown
Audio Encoder
AAC, Stereo (L R), 48.000 kHz
Video Encoder
Format: QT
Width: 1024
Height: 576
Pixel aspect ratio: Square
Crop: None
Padding: None
Frame rate: (100% of source)
Frame Controls On:
Retiming: (Fast) Nearest Frame
Resize Filter: Linear Filter
Deinterlace Filter: Better (Motion Adaptive)
Adaptive Details: On
Antialias: 0
Detail Level: 0
Field Output: Progressive
Codec Type: H.264
Multi-pass: On, frame reorder: On
Pixel depth: 24
Spatial quality: 74
Min. Spatial quality: 25
Key frame interval: 24
Temporal quality: 50
Min. temporal quality: 25

And then, frame controls 'ON', resize filter set to 'BETTER'

Hope that help, sorry if your not on a Mac.
__________________
FCPX/LS300/EX1/FS100/GoPro/Vinten/HotHead/Jib/Track/Dedos/Lightstorm/Coollights
Duncan Craig is offline   Reply With Quote
Old May 25th, 2010, 08:08 AM   #7
Major Player
 
Join Date: Jun 2004
Location: Oxfordshire, UK
Posts: 416
Duncan - I am on a Mac, so that's very useful, thanks very much. As you say, the encoder is nothing unusual, and I already have those facilities. I suspect it shows the quality of the original EX footage compared to what I'm used to: Z1s and HDV, which I am beginning to find less and less acceptable....

You realise this is all pushing me towards upgrade time? :-)

Many thanks again. Now: back on topic:
__________________
Martin at HeadSpin HD on Blu-ray
Martin Mayer is offline   Reply With Quote
Old May 25th, 2010, 10:11 AM   #8
Major Player
 
Join Date: Sep 2008
Location: Vancouver, Canada
Posts: 975
Really nice piece of work Duncan! I really liked the way you kept the energy going with stuff moving in and out of frame.

I would say the "secret sauce" of Duncan's Compressor settings are controlling the keyframes in the video settings and activating "Frame Controls" and tweaking the individual settings there.

-Andrew
Andrew Stone is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:08 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network