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Re: How do I instal on a Nikon d3300 an opteka 500 mm...
Mount the multiplier onto the camera and then mount the lens onto the multipler. This assumes that by multiplier you really are referring to a tele-extender.
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Question edited for clarity. It is a *lens, not 'lense'. The model is a D3300.
When you look at something with your eyes, the field of view is around 35mm, so a lens that covers that is useful. Then at the higher end a 85mm to 210mm zoom cover the higher end. You already have and extreme telephoto. eBay or Kijiji.
First, make sure that you have the right adapter to couple this lens to your Nikon. A universal adapter may actually fit and properly click into place but the electrical contacts may not match your Nikon. Make sure the electrical contacts on the adapter match the contacts on the camera body.
If they don't match, get an adapter specifically for Nikon and perhaps, specifically for your camera.
Once you have verified that it is a Nikon adapter, you need to make sure the electrical contacts between the adapter and the camera body are clean. Many people clean the contacts by holding the lens release button down and twisting the lens or in this case, the adapter, on and off ten or more times.
If neither of these options work you may need to contact Opteka, Nikon or both.
The same way you attach any other lens to the camera. See the instructions in the "Attach a Lens" section of the camera manual (page 17 in my copy). Be aware that this lens lacks the electronics to communicate with the camera. You will have to shoot in the Manual exposure mode, setting both the shutter speed and aperture yourself. You also will not get any exposure help from the camera's meter.
You did not provide enough information to determine what your problem is. For example, were the pictures all light or all dark. Knowing this lens, I will assume that they were all dark. So...
1) This is a very, very slow manual-focus lens. It will not auto focus. It must be manually focused very precisely because it has virtually no depth of field.
2) Depending on your camera, your internal light meter may not work. On my camera (Nikon D-90), it does. If it does not on yours and I suspect that may be your problem, you're going to have to shoot everything manually, i.e. setting the shutter speed and lens opening yourself. You can use your internal light meter to help you get started by taking your light reading before you install the lens...preferably using the aperture only setting where you set the aperture at f8 which I think is the speed of the Opteka and let the camera set the shutter speed. Make a note of the shutter speed then attach the Opteka to the camera and mount the lens on a tripod with the camera attached.
Then set your camera mode to manual and set the aperture to match the lens (f8, I think). Set the shutter speed at the speed you noted earlier. Shoot a picture using a remote shutter release or the self timer. This lens is so slow that unless you're in exceptionally bright conditions you will get fuzzy pictures due to camera movement at full zoom of 1200m and above if you're using the 2X doubler. I would start shooting at minimum zoom of 650 without the 2X doubler. Shoot a picture. and check the result.
You should have an image but it may be too light or too dark.
If its too light you'll need to increase the shutter speed or stop down the aperture to, say, f11...or both. Make the adjustment and shoot another picture. Remember that if you increase the aperture, you increase your depth of field, making focus less critical. If you increase the shutter speed you make camera or subject movement less critical.
If it's too dark, you can only increase the shutter speed because you can't open the lens any wider than f8. Make the adjustment and shoot the picture.
Keep doing this until the pictures are the way you want them.
This is a decent lens for the price and worth the little money they cost if you can't afford $10,000 plus for a high quality telephoto lens of this size. I would forget about the 2X doubler because as others have said, it further reduces the speed of an already very slow lens with such a high rate of magnification that a knat landing on the lens could cause the picture to blur from movement.
The Rokinon lens does not have the electronics to communicate with the camera. You must set the camera to the Manual exposure mode in order to use this lens. You control the shutter speed on the camera and the aperture by turning the ring on the lens. You also will not be able to use the camera's exposure meter; you can use the LCD display and the histogram to fine-tune the exposure.
Refer to the manual for full details on using the Manual exposure mode.
To figure the equivalent coverage comparable to a film camera, multiply the number of mm by 1.5. Example: a 50mm lens will be like a 75mm lens on a digital camera.
The Nikon Optiphot 2 tube length is 160 mm DIN finite. It is a 1990 vintage microscope. Any objective lens with the standard RMS thread, -160 engraved on it will work. It will not work with other brnads with the infinity symbol engraved on it or infinity tube length Nikon 200 mm, CFI60 objectives for 2000 vintage to present microscopes. - Lawsen Lew
You'll have to use the Manual (M) mode. You'll have to focus manually and the camera's exposure meter will not be functional. Since this is a fixed-aperture lens, you'll have to control the exposure with the ISO and shutter speed. You'll almost certainly need a tripod.
If you don't shoot RAW, you'll probably want to increase contrast and sharpness slightly to compensate for the lens's inherent softness.
I am in possession of a opteka 500mm/F8 lens. by a faulty assembly after cleaning them, I can not make more clear photos. you have such a schedule or on the building and replace the lenses so I can return the lens mount as it should
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