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When I install my video camera's drivers with a command:

modprobe usbserial vendor=... product=...

it gets installed as "sg3" instead of something like "ttyUSB0". Why is that?

I did look at the dmesg, it looks like this (this is where I got that it is sg3, I am not a daily linux user, I just need to get something done, so please don't judge me for my poor knowledge):

[  292.940045] usb 2-4: new high speed USB device using ehci_hcd and address 7
[  293.094070] usb-storage 2-4:1.0: Quirks match for vid 0525 pid a4a5: 10000
[  293.094125] scsi7 : usb-storage 2-4:1.0
[  294.095461] scsi 7:0:0:0: Direct-Access     Linux    File-Stor Gadget 031a PQ: 0 ANSI: 2
[  294.096689] sd 7:0:0:0: Attached scsi generic sg3 type 0
[  294.103465] sd 7:0:0:0: [sdc] 838860800 512-byte logical blocks: (429 GB/400 GiB)
[  294.208275] sd 7:0:0:0: [sdc] Write Protect is on
[  294.208284] sd 7:0:0:0: [sdc] Mode Sense: 0f 00 80 00
[  294.208290] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[  294.318200] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[  294.318222]  sdc:
[  294.428212] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[  294.428225] sd 7:0:0:0: [sdc] Attached SCSI removable disk
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closed as not a real question by Gilles, Ulrich Dangel, jasonwryan, warl0ck, Mat Sep 22 '12 at 14:46

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

That sounds a bit strange. Did you look in your logs (dmesg/var/log/messages)? –  Mat Apr 30 '12 at 8:26
Loading a serial driver and getting a SCSI node instead of a video node. Yeah, NOTHING about this question seems COMPLETELY MESSED UP... –  Ignacio Vazquez-Abrams Apr 30 '12 at 8:29
what distro you use? –  XinHua Apr 30 '12 at 8:46
I added some more info to the question. Sorry, @Ignacio Vasquez-Abrams that my question is SO MESSED UP, that you had to write it in the block letters. Perhaps I am doing sth wrong when installing the drivers, but I didn't think there was much to do wrong. –  Magda Apr 30 '12 at 10:55
It could be that the camera has different modes like usb surf stick which could appear as a storage device and as serial device. Have a look at usb_modeswitch and askubuntu.com/questions/89629/… –  jofel Apr 30 '12 at 11:51

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