| Author | Message | ||
     douds Rating: N/A |
Hi! anyone know what is the best between LANC shepherd or stefra LANC in order to synchronise two sony HC1? Do you know what are the differences between the two systems? Thanks | ||
| M.H. Rating: N/A |
stefra LANC in any case ... - smooth zoom start and end (in software) - well tested with Sony cameras - sitch betwen photo and camera mode shephard is design for photgraphy, not for video ... | ||
| G.B. Rating: N/A |
I use the LANC Shepherd for Video & Still photography, all the benefits of the Stefra Michal Husak says are available with the LANC Shepherd AFAIK. -Zoom rate can be adjusted in steps from 1 (glacial) to 8 (mach). I use my LANC Shepherd with the SONY PC105 and SONY V1 Digital still camera. The LANC automatically switches between the two LANC protcols. The unit's compact and works very well web.onetel.net.uk/~gedburnell/PC105.htm Ged | ||
| M.H. Rating: N/A |
Ged: Are you sure the Shepard has build in support for smooth zoom start and end ? I do not speak avous zoom sped adjsutment, I speka about build-in code changing the zoom speed smoothly during zomm start and end ... From what I know it does not have this functionality and zooming during shooting by videocamera looks a bit strange .... | ||
| G.B. Rating: N/A |
Sorry Michal, I misunderstood your post. The LANC Shepherd doesn't vary the zoom speed at the start or end of a zoom. Though I very rarely use the zoom while shooting anyway as camera alignment needs to be very accurate, quite difficult to achieve with my set up. Any slight misalignment at wide angle gets magnified in telephoto and makes setting the stereo window difficult in post. Ged | ||
| M.H. Rating: N/A |
G.B. : Yes. Zooming is realy non-trivial. But the problems you mention can be handled partialy in post processing ... It require realy sophisticated vertical and parallax correction application with the ability to animate (continuously change in depenece on movie position) the correction ... In this way it is possibel to use zoom in stereo and the results look acceptable ... | ||
| G.B. Rating: N/A |
H.H. The solution you mention I solved with an Avisynth script & VirtualDub. See: http://web.onetel.net.uk/~gedburnell/video.htm I haven't used it since my NuView attachment days and it's only useful for minor misalignment, but it does work, there's a demo video to watch. Ged | ||
| M.H. Rating: N/A |
We use for this purpose a proprietary Adobe Premiere plugin. This plugin has stereoscopic preview so we can create keyframes and aniamate the paralax corrections betwen them .... We had tested this for up to 10x zoom with very good results ... | ||
| G.B. Rating: N/A |
Are you able to make minor alignment adjustment to the cameras on their mount? The reason I ask is our solutions are only good for minor misalignment, i.e I'd say no more than 10% misalignment of frame dimensions e.g. 72 x 57 pixels for a PAL frame. The more the discrepancy between frames the less you have in common to fix. Ged | ||
| M.H. Rating: N/A |
G.B. We have camera mounts with screws for totaly precise alighment. We can do 100% precise camera alighnmet by the help of on the fly overlaped preview from both cameras (we use DepthQ Mixer software - analog of Peter video mixer) .... During zooming we get much more than 10% disaligment even when at the start tha cameras are 100% aligned. We use HDV cameras - so we can compensate even for big changes with nos to big quality lose ... | ||
| Ged Rating: N/A |
Michal, Do you have any photos of your rig? Ged | ||
| M.H. Rating: N/A |
We use the SteFra CAM rigs ... http://www.digi-dat.de/produkte/index.html The camera holders have screws for realy precise alighment ... | ||
| clyde Rating: N/A |
is it possible to have 8 such cameras synced via a lanc controller? What are the issues that will be faced to do something like this. Also is it possible that during recording, the cams drift off to over 10ms and thus the lanc controller will stop functioning? Regards Clyde Ps its for an experimental 8view autostereo video shoot. | ||
| M.H. Rating: N/A |
Clyde: Each camera must has its CPU in the controler = so what you need is posisble but it will require custom development. If you will do restart in 30 minutes intervals or so, 10 ms drift will be never reached ... Generaly I sugegst you to use cameras with Genlock, not based on LANC for what you do .... Genlock is much more suitabel for multiple cameras sync ... | ||
| clyde Rating: N/A |
Hi Michal, thanks for the good reply! I was thinking genlock is best for sync, but i want to use 8 cams on a horizontal bar and need slim cameras such as the new Sony Hard-ddisk recording one. Regards Clyde | ||
| M.H. Rating: N/A |
Clyde: It look like the LANC is the only one solution for you ... Some of the small PAL/NTSC cameras has adjutable clock = perfect sync can be achived forever. You shoudl study follwing document and cotnact Damir for more hints: http://www-e2.ijs.si/3dlancmaster/3DLANCMaster_Paper.htm |
