Nice try. It's not called a diaphragm or "diaphram" as you spelled it though. Why don't you use wikipedia to look it up.
the iris
Lenses for Nikon camera can be purchased from any local camera stores. However, one can find a better deal on some online stores like eBay and Amazon.
The Nikon D3200 camera is compatible with Nikon F-mount lenses, which includes a wide range of lenses from Nikon as well as third-party manufacturers like Sigma and Tamron.
A camera's diaphragm and your eye's iris perform the same function in the same way. They both control how much light is allowed through the lens by expanding and contracting.
I'm just going out on a limb here but I'm GUESSING that it is used to hold a camera or camera accessories like an attachable flash or different camera lenses.
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As in a camera, this part is usually called an iris diaphragm. It can make the aperture bigger to let in more light, or smaller to make the image sharper. The shutter in a camera is not the same thing.
well,they focus like your eyes,when things are far,the lenses moves back and forth to adjust the clearness and blurness.<3vnh
Lenses like this are usually available in places like Well's Camera Shop. Some stores like Walmart may carry them and online, Amazon lists this product.
Like virtually all camera makers, Nikon's camera mount is propriatory to Nikon, but there are third party manufacturers - Sigma and Tamron are probably the most well known - who make compatible lenses.
The iris diaphragm is named after the iris, the colored part of the eye, because of its similar appearance and function. Just like the iris controls the amount of light entering the eye, the iris diaphragm in a camera lens controls the amount of light entering the camera.
The Nikon D5500 is compatible with lenses that have a Nikon F-mount. This includes a wide range of Nikon lenses, both DX and FX format, as well as third-party lenses from manufacturers like Sigma and Tamron.