the SND 3600 C2 price is 30 €.
the SND 3600 C2 is an usb 2.0 device powered via usb.

it's not a scanner (you cannot use any SANE technology).

it's a camera. an uvc 1.00 compliant one with a button to take a photo.
format: 2592x1680
about 4.35 Mpx compared to a slide about 11 Mpx

result of "lsusb" :

Bus 001 Device 009: ID 0c45:6366 Microdia

result of "dmesg| grep -i usb":

[31965.187489] usb 1-2: new high-speed USB device number 9 using xhci_hcd
[31965.328487] usb 1-2: New USB device found, idVendor=0c45, idProduct=6366
[31965.328488] usb 1-2: New USB device strings: Mfr=2, Product=1, SerialNumber=3
[31965.328489] usb 1-2: Product: USB 2.0 Camera
[31965.328489] usb 1-2: Manufacturer: Sonix Technology Co., Ltd.
[31965.328490] usb 1-2: SerialNumber: SN0001
[31965.330115] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:6366)
[31965.335346] input: USB 2.0 Camera as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/input/input19
[31965.337129] input: Sonix Technology Co., Ltd. USB 2.0 Camera as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.2/0003:0C45:6366.0005/input/input20
[31965.391897] hid-generic 0003:0C45:6366.0005: input,hidraw2: USB HID v1.11 Keyboard [Sonix Technology Co., Ltd. USB 2.0 Camera] on usb-0000:00:14.0-2/input2

you can see that the button to scan the slide/negative is seen as a usb 2.0 keyboard.

i did not find any linux app to use this device to scan photo slide/negative.

i set "Cheese" according to use the SND 3600 C2 instead of my webcam.

i use "Cheese" to take a photo of my negatives one by one.

after that i use digikam:
- to create positives from negatives (colour inverse feature)
- to fix colours with "automatic levels"

i use digikam batch feature to do this on all photos in one step.

quality of photos: 10/20, not very good but sufficient for me (not a professional). i just want to keep souvenir.