I just receved my Tiffen 2X teleconvertor telephoto lens add on for my 850Z. The camera looks pretty cool with this lens screwed onto it. The pictures look very good also. Frankly, I am surprised. I thought the camera would have a problem with the image quality. I guess Tiffen and Epson worked on this and it came out right.
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Re: Tiffen 2X teleconvertor telephoto lens
I was testing the new Kenko 2x teleconverter I just got. Seems to work, but only at full zoom. But I left the epson supplied adapter ring on when I turned the camera off, and it interferred with the lens cover, and jammed it. It's a 4 leaf shutter assembly, and mine is screwed up so it won't open or close. Needless to say I'm kind of unhappy. I've heard Epson service is good, guess I'm about to find out.
If you use the adapter, take it off when you turn the camera on or off!
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You don't. The Zeikos attaches to the front of lens with a 52mm filter thread, which then attaches to the D90. If you have the 18-55mm lens, for example, this will fit onto the front of that lens, effectively converting it to a 36-110mm lens. If you have the 18-105mm lens, this won't fit onto it. This device is really intended for use with cameras that don't have interchangeable lenses. With your D90, you're much better off using another lens instead of putting this onto the front of another lens.
It's a cheap(ish) generic screw on lens multiplier and so compatibility with anything it's screwed onto is a matter of pot-luck, especially as the conversion factor is so high.
There is nothing you can do, other than to try alternative brands (preferably not exceeding 1.4x) or to obtain the expensive Panasonic version which is designed to be compatible with your camera. Even the official product will produce some distortion (usually barrel distortion) and most likely a fair bit of chromatic aberration. It's just usually less adverse than with the generic products.
Did you tell the camera that you are using an external/additional lens? You have to specify it somewhere in the menu, the camera gives you some options (the lens model numbers) and you need to match it with your lens' model number.
You can also get a 1.4 or 2x teleconverter to further increase the power of a telephoto lens. However, the cameras are unable to auto-focus when the minimum f-stop exceeds f/8, which can happen when you use one (or both) of the teleconverters on these longer lenses, so you have to manually focus the lens.
You can also get telephoto lenses from other manufacturers such as Tamron and Sigma that are built to work with Canon cameras. However, the Canon lenses are generally regarded as the best quality.
There are lenses available to add with an adapter ring. I have the wide angle lens (which I LOVE) and a 2x telephoto lens. The wide angle lens allows me to macro from several feet away. It is an amazing lens. The telephoto lens is something you really need to use with a tripod. But yes, there are lenses you can add to your camera.
With the telephote lens, I am assuming that the camera is a bit more sensitive to any form of camera shake. My suggestion, when using the telephoto lens, is to manually set the shutter speed to its fastest setting (that, or set it to "sports mode"). Also, experiment with the telephote lens using your tripod. Set the camera up on a table and use the timer so that the camera will snap the image automatically. See if the picture is still blurry. If you don't have a tripod, just place it flat on the table.
Get a CLA-1 lens tube. It screws into the camera body. The other end accepts 43mm accessories. Put on a 43-49mm step-up ring. Into that screw a 49mm UV filter. (The step-up ring is needed to separate the filter from the extended lens.) Leave the UV filter on at all times. Throw away the lens cap.