You can do better and cheaper like this (rear lens cap with an end cap of a sewer pipe):vacuumMarshmallow wrote: I hope I can save you time, money, and headaches (and some tears).
I had a LOT of those figuring the following setup out.
1st, the rPi's camera board is fantastic.
Get an extended "CSI" flex cable from adafruit or somewhere... the stock cable is very short.
A longer one (12" or more) will give you more flexibility, and they are cheap.
2nd, buy this adapter from eBay: Vello Nikon F Mount Lens to C Mount Camera Adapter
3rd, buy a Nikon lens from eBay. (Nikon's lenses' brand is "Nikkor"... same company, different name)
4th, buy the adapter the gentleman in this page mentions:
He manufactures them and sells them.
The problem is price (150$ish) and time (about 3 weeks for delivery).
Here is the setup:
#1- take the Nikon lens, and open up the iris manually... it has a little mechanical level on the backside.
Hold the iris open with a small glob of hot glue.
#2- Put your Nikon lens into the Vello adapter from eBay
#3- take the Nikon+Vello combo, and screw it into the metal adapter from truetex.
#4- remove the rPi camera board's little plastic lens
#5- use the two screws (included with the truetex adapter) to fix the entire combo (Nikon+Vello+truetex) onto the rPi camera board
The image quality is excellent... perfect.
You can buy polarizers for the Nikon lens.
You buy big Nikon lenses, or small ones... wide angle, or whatever angle.
You mentioned 11 cm focus.... I have no idea what that is.
I have bought various Nikon lenses.
They all work awesome... yet the focus distance is kind of off.
For example, a Nikon 18-35 lens, I am unable to get a "sharp" image when set at 18mm-ish.
I have to turn the rings until I am in the 20-24mm range (this measurement is by eye).
Once in that range (and higher), you can then move the "focus" the image to make it "sharp".
As to Nikon vs Canon lenses,... only one reason.
The Nikon lens, to open the iris, you can do it manually as I mentioned above.
The Canon lenses, it is electronic.
I hope this helps you.
I threw thousands of dollars into this problem... with many, many hours invested in figuring the above setup out.
As an extra advantage you have four screws to adjust the distance and perpendicularity of the sensor, which is very important to get the optimum image quality; the sensor is glued to the board with a pad and not by definition perpendicular to the lens axis.