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Do you have a lens collimator and other equipment necessary to ensure proper alignment when reassembling the lens? If not, take it to a good camera shop and have a properly trained and equipped professional do the job.
This will have to be sent in for repair, no other way around it. Call a camera repair facility first before you send it in to get a quote, many times a new or used lens is cheeper. Don't forget to check Ebay. Good-luck
This lens does not have the electronics to communicate with the camera. You have to use the camera on the Manual exposure mode (turn the mode dial to M) and set the aperture and shutter speed yourself. You will not get any metering help from the camera's light meter, but you can use the histogram to fine-tune your exposure. You also have to focus the camera manually.
You'll want to use a tripod or other support, as the lens will magnify every bit of camera shake.
The filters go on the back of the lens (the end that connects to the camera). If you detach the lens and look inside, you'll see a threaded ring. Simply screw the filter on, similar to how you put filters on the front end of other lenses.
Due to the great magnification ratio of this lens, you absolutely need to have it on a tripod or other stable support. Even the slightest camera shake will be magnified.
The lens also has very little depth of field, so you must focus precisely. Since you're mounted on a tripod, you might want to activate the LiveView feature and zoom in the subject while you focus.
For the Rokinon 500mm F/6.3 lens, you can either attach 95mm filters to the front or 34mm filters to the rear of the lens.
For the Rokinon 500mm F/8 lens, you can only attach 30.5mm filters to the rear of the lens.
To attach a filter to the rear of the lens, remove the lens from the camera (or take the rear lens cap off). There's a threaded screw mount just inside of where the lens fits onto the camera. Take your filter and screw it into place. Hand tighten until it's snug and doesn't project in the way---remember, you're going to want to take it off again later.
The Rokinon lens lacks the electronics to communicate with the camera. You need to set the camera to the Manual exposure mode. Since the mirror lens also lacks an aperture control, you will need to control the exposure by changing the shutter speed and/or the ISO setting. Also, depending on the model of your Nikon, you may or may not get any exposure assistance from the camera's light meter. If you don't, you can use the image review on the LCD and the histogram to tune your exposure.
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