Free Shipping on ALL Products
camera reviewsbest cameraslens reviewsphotography tipscamera forumvideo toursphotography bookssupport me
It is currently Sat Sep 20, 2014 6:15 am

All times are UTC




Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Wed Feb 24, 2010 5:37 pm 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9822
Location: UK
Hi folks,

Lots of videos shot with DSLRs look pretty awful to my eyes when the frame includes rapid motion. Stroboscopic, or stutter, effects destroy any pretence at a natural look.

But those helpful people over at the Canon Professional Network have just published the article 25F Progressive video: the cinema show which contains some handy hints, particularly on the second page. While the article is not particularly DSLR focussed I think much of it also applies:
    Shooting 25F: Camera handling

    How do you avoid flickering or strobe-like images? If you have played around with progressive video before, you have probably wondered why those Hollywood movies, shot at only 24 frames per second look so steady and ‘peaceful’ in comparison with your own. Well, besides a considerably lower budget, that’s because progressive filming is all about camera handling.

    The same handheld shot that worked fine in 50i may end up somewhat disappointing when it was made with your camera set to 25F. Due to the lower refresh rate of the image, a shaky camera style is much more unpleasant to watch in 25F than it is in 50i. So you’ll have to make an effort to make slower better-controlled camera moves and take it a little easy on the panning.

    Objects that move horizontally through the frame can result in a very noticeable 'stutter' and ruin your shot. Instead, try to follow your subject while leaving the background slightly out of focus. This will create a motion blur that makes everything run smoothly.

    You can also change the composition of the shot. For example, instead of having your subject move across the frame, you could have it move at an angle to the camera, say, along a roughly diagonal line.

    Shooting 25F: Shutter speeds

    In most situations a good shutter speed for 25F footage is 1/50sec. With that speed you get smoothly moving images, while retaining enough detail in slow motion. Using a higher shutter speed will give you lots of detail but it can also cause serious stutter and will definitely be uneasy on the eye. When capturing high-speed motion, as in sports, a smaller shutter speed will give you very crisp images, although they can look somewhat artificial. This, of course, could be exactly the effect you are going for.

    A big advantage of shooting 25F is that you can go down to a shutter speed of 1/25sec, which gives you an extra f-stop of exposure. This makes 25F ideal for shooting in low light conditions. With a 1/25sec shutter speed you need to take into account that you will have a lot more motion blur with moving images. The picture looks very smooth but moving objects can lack detail.
Definitely worth giving the whole article a read, though, and kudos to Canon for producing it. 8)

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Last edited by Bob Andersson on Sun Jul 25, 2010 10:42 am, edited 1 time in total.

Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 24, 2010 6:07 pm 
Offline
User avatar

Joined: Sun Feb 15, 2009 12:59 pm
Posts: 6009
Location: The Netherlands
So, to paraphrase: if you shoot at 24P to be "like the pro's", your video will suck because you do not have a steadycam? 8)

_________________
I take pictures so quickly, my highschool was "Continuous High".


Top
 Profile  
 
 Post subject:
PostPosted: Thu Mar 04, 2010 2:30 pm 
Offline
Moderator
User avatar

Joined: Thu Nov 08, 2007 6:30 pm
Posts: 6953
Location: The Netherlands, Ridderkerk
Thanks for the link Bob!

Remember to keep the 180 degree shutter rule in mind when shooting at 24 frames per second, 1/48 (or 1/50) is the minimum shutter speed you'd want to use. Of course, as usual in photography and videography, rules are meant to be broken.

- Bjorn -

_________________
Street and documentary photographer | Google+ | Twitter

Leica M9-P (my article on Camera Labs) | Leica D-Lux 5 | 50mm Summilux


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jul 25, 2010 10:46 am 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9822
Location: UK
Hi folks,

While trying to sort out a stubborn DVD playback issue in Windows Media Center (don't ask!) I came across an article about "HD Video Judder & Smear". It wasn't relevant to my problem but it seemed quite relevant to this thread. Check out Understanding HD Video Judder & Smear. Just to whet your appetite:
    This brings us to the main reason HD appears to judder more than 35mm film. Depth of field.
Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  

All words, images, videos and layout, copyright 2005-2012 Gordon Laing. May not be used without permission.
/ How we test / Best Cameras / Advertising / Camera reviews / Supporting Camera Labs

Webdesign by Alphabase IT
Powered by phpBB® Forum Software © phpBB Group