I did not get any instructions with my Opteka. Have tried to take photos with it. But they came out all blank. I used a tripod. Would like to know where I can down load instructions. Certainly not as good...
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.
Jun 26, 2011 |
Opteka 650-2600mm High Definition...