This topic contains 92 replies, has 24 voices, and was last updated by Haukinger 8 months, 3 weeks ago.
April 5, 2006 at 9:15 pm #175656
Mirko, I am sorry to hear that the Canon’s ability to be somewhat remote controlled is rare. Based on what I’ve seen, I can confirm that my PowerShot A70 can send the viewfinder image over USB as well as a full camera capture, but the controls for adjusting white balance etc. are Canon-specific extensions atop PTP. With Saul’s pointing it out, I’ve used ptpcanon to do this, a Canon-specific fork of ptpcam. (Canon does support its own completely proprietary protocol in addition to PTP).
A plea to all interested parties: write to the camera manufactures and ask them to support open standards, such as PTP, for controlling cameras from a computer, and ask them to publish details on how to do this using their cameras. If you buy a camera that is controllable from a computer, consider letting the manufacturer know why you chose their model.
Just an FYI, there is an IEEE1394 standard for aquiring images from still cameras and adjusting brightness etc, called IIDC or DCAM, supported in Linux by Coriander. Coriander states IIDC is used by industrial and scientific cameras; I am unaware of any cameras that use this. This is in addition to the 1394 standard for acquiring DV over 1394 (the Linux drivers refer to it as AVC, not sure of the official name), but as far as I know it does not support any commands to control a camera (aside from a few to play or rewind the tape in a camcorder).
P.S. Thanks for the screenshot.April 6, 2006 at 7:29 am #175759April 6, 2006 at 4:42 pm #175822April 6, 2006 at 5:30 pm #175831
According to the reverse engineered commands here, the zoom is set by a command that can only take parameters from 0-10 (0-6 being optical zoom settings). This seems to be not just a limitation of the SDK, but either of the camera hardware (can you choose more than six settings with the lever on the camera? I’ll have to check this tonight) or at least the command set of the remote interface.
MirkoApril 6, 2006 at 6:08 pm #175844
I just happen to have my camera here at work with me. Yes, zoom goes all the way in to all the way out in 6 increments.
I don’t think using zoom yields very good results for macro-style shooting, though. In order to get proper focus, it’s better to use macro mode or install macro lenses. Or both, which is what I did for some shots in System Reboot.April 7, 2006 at 7:17 am #176092April 7, 2006 at 9:05 am #176097
“Haukinger” wrote: The QC4000 has no zoom at all, so 7 steps are a big improvement.
I guess there is nothing wrong with 7 steps. I didn’t even notice the zoom is not continuous until I read your post, but what RevMen says is true: I cannot zoom from wide to tele in more than 6 increments on the A70 either. Zooms in film are probably better done in post production anyway.
Autofocus is poor in tele-macro, you can’t get closer then about 30cm… but distortion is much higher in wide-macro.
The most important thing for me is to have wide-angle in macro mode (not possible with the C-5050, e.g.). I believe it is more natural to get closer to the object and use wide-angle, as a tele lens from farther away tends to look like you’re observing the minifigs through binoculars.
MirkoApril 7, 2006 at 10:21 am #176106
An Old OreParticipantApril 7, 2006 at 11:57 am #176114
DSLRs are great for brickfilming, because you can attach a manual lens. You need a webcam or dv for live-preview, though, because a DSLR can’t do this (Olympus E330 being the notable exception).
Shutter lifetime is another aspect… I don’t hesitate ‘murdering’ a cheap 150euro A520 for brickfilming, but a $1000 E330 ?April 7, 2006 at 12:41 pm #176121
I’ve been looking for a suitable lens for my Pentax istD for some time now, to no avail. I want a small minimal distance (like 3-5cm) but even macro lenses don’t seem to be able to do this, the distance between lens and object usually has to be more like 20cm. I’ve also experimented with macro rings (too narrow depth of field) but I don’t quite like what I get there: In my opinion, the camera has to be really near to the objects or otherwise it’ll look like the film consists of one boring tele shot after the other. I think I will stick with my A70 now, the image quality is certainly good enough and the camera itself is quite handy (small and with flexible options like zoom in macro mode). If anyone has success with a DSLR, I’m certainly interested to see the results and reconsider, but for now I have given up the search for a lens that suits my needs.
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