Airy Disk Diffraction Limits

http://www.cambridgeincolour.com/tutorials/diffraction-photography.htm

Raw Image Software

http://www.addicted2light.com/2012/05/31/review-raw-converters-mega-test-part-v/

1. White Balance - temperature and tint adjustment sliders
   
   
2. Exposure - exposure compensation, highlight/shadow recovery
   
   
3. Noise Reduction - during RAW development or using external software
   
   
4. Lens Corrections - distortion, vignetting, chromatic aberrations
   
   
5. Detail - capture sharpening and local contrast enhancement
   
   
6. Contrast - black point, levels and curves tools
   
   
7. Framing - straighten and crop
   
   
8. Refinements - color adjustments and selective enhancments
   
   
9. Resizing - enlarge for a print or downsize for the web or email
   
   
10. Output Sharpening - customized for your subject matter and print/screen size

http://www.cambridgeincolour.com/tutorials/digital-photo-editing-workflow.htm

Minimum Sizes

Kodak, for example, suggests these resolution/file sizes:
For a 4" x 6" print, the image resolution should be 640 x 480 pixels minimum.
For a 5" x 7" print, the image resolution should be 1024 x 768 pixels minimum.
For an 8" x 10" print, the image resolution should be 1536 x 1024 pixels minimum.
For a 16" x 20" print, the image resolution should be 1600 x 1200 pixels minimum.
For a 20" x 30" print, the image resolution should be 1600 x 1200 pixels minimum.
For a Wallet-size print, the image resolution should be 320 x 240 pixels minimum.

http://www.urban75.org/photos/print.html

Standard photo print size

Print size

Use this guide to find the standard photo print size and pixel dimensions you'll need for the perfect image.

http://www.picmonkey.com/help/articles/633730-standard-photo-print-size

MTPLVCAP is an app to enable some Nikon DSLR's as a webcam. GPhoto2 and gvfs-mount will also need to be installed to mount the camera's flash drives. You will find the list of supported Nikon camera's, which can also be found following the link below.

https://github.com/puhitaku/mtplvcap

I am using a D610 on a very old i7 930, 2.8 GHz, 12GB RAM running Linux Mint 18.3.

There are two shortcuts I created on the desktop for starting and stopping the camera. When I turn the camera on, the first thing Mint does is mount the two flash cards in the camera and throws up a message stating that the capture device cannot be accessed. So, I need to click OK to the message every time I turn the camera on. Before running mtplvcap, the drives need to be unmounted. The following script, that I named D610_START.sh, unmounts the flash cards and starts mtplvcap; the shutter will click when it opens. Run the mtplvcap program and script from any folder under your username. The program may need to be made executable by going to Properties and Permissions and selecting the option to execute the file.

#Start Script
gvfs-mount -s gphoto2
sleep 2s
/home/owner/D610_Webcam/mtplvcap
#End Script

The camera image can now be accessed from http://localhost:42839/view to view the image and http://localhost:42839/ to focus the camera.

In OBS, add a Scene with the name of your camera. In that Scene, add a Browser and use the first link above as the source. Then, you can create your main video Scene and add the Camera Scene for your camera's video.

To shut the camera down, meaning close the shutter, mtplvcap needs to be closed and the flash drives need to be mounted, then immediately unmounted. Gvfs-mount is used by Linux to mount and umount the usb device. Both drives use one usb device on different stores. Unmounting one store will unmount anything attached to the usb device.

#Start Script
killall -9 mtplvcap
gvfs-mount gphoto2://[usb:]/store_00020001
gvfs-mount -s gphoto2
#End Script

I hope this helps! I spent a long day trying to get this to work and hopefully you can do it in an hour or so. Good luck!