Logitech C615 with new lens

[hal]

Hello Chris,
thanks for sharing. I've linked your usefull file to the "Useful Hardware" page.
I guess it would be good for many davidians

Thanks and best regards,
Mattia

[netmares]

Hi again,

I am working now with the c615 camera. I am trying to take images programmatically. Does somebody knows which are the effective pixels of c615 camera cmos sensor? And which is the max. resolution image that I am able to acquire (with no interpolation)? (I have read in Logitech specifications that it gives up to 8Mp, but I suppose is by interpolating somehow).

Thanks. Regards,
Miguel.

[WalterMo]

You can work with DAVID with these pixel sizes without interpolation, means at maximal 2 Mp.
If you like to extend the USB cable, so use a repeater cable (active extender).

Walter

[gkrywusha]

Hi Walter,

About to try this mod out as I'm using a chinese camera (though with the nice lens from B&H) but finding minimal resolution choices and extremely slow scan speeds vs. my webcams.

Question I have is this... how does the IR cutoff filter factor into scanning? Do you need it and how hard is it to apply to this project?

I can get the rest of the parts locally but not that piece and wonder both in construction and final output how with/without it is affected. I'm not trying to grab color at this point.

Thanks so much in advance for your expertise.

Greg K.

[WalterMo]

Greg, if you don't want to grab a color texture so you don't need an IR cut-off filter. A gray scale texture will work.
You can put this filter later on in front of the photo sensor. Unfortunately these filters are not cheap.

Here (July 17 th) you can see the differences between images made with and without an IR cut-off filter:
viewtopic.php?f=2&t=2069


Walter

[gkrywusha]

Thanks Walter,

Going to start the project then. Waiting on my cs/c mount adapters, but can start the disassembly now. Thanks again.

Greg K.

[gkrywusha]

Hi Walter,

Already finished the camera assembly and thanks for your input/advice. Camera works and lens really allows for clear focus.

Problem I'm having in David is that my scans have a light crosshatch texture or horizontal banding caused by frequency I believe. Which drivers do you recommend? I've tried the lastest logitech (251) as well as microsoft's generic one. Issue with the latter is stuck with 1/32 or 1/64 for exposure. The logitech allows for more options in setting exposure.

Is there a way to minimize noise or better adjust frequency? So close to getting this to work.

Thanks in advance,

Greg K.

[WalterMo]

Greg, good to hear of your progress.
The banding could be caused by interference between the screen refresh rate and the camera's exposure time. Best is you set the refresh rate to 60 Hertz and the camera to 1/30 sec or 1/60 sec.
http://wiki.david-3d.com/david3_user_ma ... ured_light

I prefer the Logitech driver. Mine is version 13.80.853.0.
My "standard" camera resolution is 800 x 600 @30 fps.

Walter

PS. Can you post a photo of your camera modification? Thanks.

[gkrywusha]

Thanks, Walter!

I will make those changes and see how it goes. I'll put up a picture of the camera later today.

Thanks again.

Greg K.

[JDM Dyno]

This is my version of C615 lens mod using original body but removed the standard lens, I made 3D printed part and glued it on, made it a good fit to the C mount lens so that screwing it in was a tight fit and made its own thread

only had to de-solder the original lens, blacked out the led and opened up the front hole, not sure if I needed to do the last bit but did it just so I did not have to take it apart again.

also printed mount/slide and a lens cap all done in Via CAD 3D.

[Mal3D]

Hi again - as requested here is my model.

To reiterate - the c-mount ring is a bit of a snug fit and some of the screw turrets were a bit weak. Apart from that, works a treat.

Chris

Hi Chris,

I modified your design slightly to use different screws and change the back, so I didn't have to cut the usb cable. This made for a upside down design that I used in making an angle bracket for. I was wondering if I could post this remix on Thingiverse with your permission along with links to your posts and design.

Thanks,
Malcom

[mathers3000]

Questions about the C615 mod.

I do not know know circuit boards. I just removed the lens and the casing by "breaking" it off. Is the De Solder Necessary?

De solder Necessary?

I did not cut the ground wire. Does the ground screw hole need to be used when I put it back together?

I am using Malcom's re-design
Thanks also to Chris and Walter

[WalterMo]

It's not necessary to desolder the 2 pins.
Pay attention that no solder connects other conductor paths from these pins or these pins together!
A tip: For desoldering I am using the (cheap) desoldering wick.

Regarding your grounding question: No, you don't have to use this hole, e.g. to put a screw inside. But I am using this hole to fix the board.

Walter

Edit: You also have removed the black plastic surrounding the photo sensor. Why? It can be the holder for the IR cut-off filter.

[mathers3000]

No ir for this camera, maybe add it later. I will use the c600 setup for color.
Walter's c600 guide ( viewtopic.php?f=6&t=3727 )
Thanks for the detailed guide.

These web Cams are currently very cheap.
C615 new on ebay $32
C600 new on ebay $20

[macdaddyjaz]

Can anyone suggest any reason why these cameras will not work with the up and coming dual camera setup in the latest David? I will definitely invest if I can make another budget cam.