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The T-mount is a universal thread developed by Tamron which allows various adapters to couple a lens to a wide variety of camera brands. If a lens is listed as having a T-mount, it means that the lens can be coupled to your camera if you have a T-mount adapter for your camera.
A 2X teleconverter (often called a doubler) enables a lens of a specific to be doubled. For example, the lens referenced above actually is a 650-1300 lens but with the 2X teleconverter the focal length can be doubled to a maximum focal length of 2600.
I have an Opteka 600-1200 telephoto lens which I consider to be a decent lens for its very low price. I also have a doubler which came with my camera kit. That means I can increase the focal length of my lens to 2400 but I cannot imagine any reason to do so. At it's full zoom 1200mm focal length, this lens is very difficult to handle and must be used on a tripod with a remote shutter release.
It is extremely time consuming to focus and must be focused very accurately because it has almost no depth of field. At 1200 mm, the slightest breeze or vibration will cause the picture to go fuzzy from movement.
The lens is also large and does not fit conveniently in a camera bag so it rarely goes with me unless I know for sure that I will need it. It is not particularly good for sports action shots because the action will be over before you are ready to shoot the picture. With very bright light (such as the mid-day sun) and pre-planning and pre-focusing you might be able to get some interesting sports action shots. Say you're at an automobile race and you know a car will be coming into view at a certain spot, you can set up for that spot then trip the shutter when the car pops into view.
All that being said, I think this is a good lens to have in my bag without spending $10,000 plus for a really good lens of this size.
Canon has four tilt-shift lenses ranging in focal length from 17mm to 90mm and in price from $1400 to $2500. Which one would be best for him would be up to him. You'll have to subtly ask him which one he might want to try.That's assuming you really mean a tilt-shift lens, given the price. They're definitely professional-grade lenses You might want to consider something like a Lensbaby Composer Pro instead, for $300 or $400.
The sensor on the D80 is smaller than a piece of 35mm film. This means the camera will only use the center portion of the image cast by the lens. This reduces the angle of view, effectively increasing the focal length. The 35-70mm will give you an angle of view similar to a 52-105mm lens on a film camera. Likewise the 70-210mm lens will give you an angle of view similar to a 105-315mm lens.
That's the focal range of a zoom lens. Unlike a single focal-length lens (or a "prime" lens) a zoom lens lets you adjust the focal range. "55-200mm" specifies the lens's focal range from 55mm at the low end to 200mm at the long end.
You can read a general description of zoom lenses at http://en.wikipedia.org/wiki/Zoom_lens
Nikon current has two different 55-200mm lenses: http://www.nikonusa.com/Nikon-Products/Product/Camera-Lenses/ 2156/AF-S-DX-Zoom-NIKKOR-55-200mm-f%252F4-5.6G-ED.html and http://www.nikonusa.com/Nikon-Products/Product/Camera-Lenses/ 2156/AF-S-DX-Zoom-NIKKOR-55-200mm-f%252F4-5.6G-ED.html
If you're asking about the L110, it has a permanently-affixed lens and will not use either of the above lenses.
Hi. Yes, you can increase your focal lenght with photo converter x1.4 or photo converter x2 so it would be 105-336mm with x1.4 and 150-480mm with x2. But consider that mounting such converters you increase the minimal aperture. Thus you will have to use higher ISO or longer shutter speed.
Presumably your images are blurred because of camera shake? What shutter speeds are you using? As a rule of thumb, don't use less than the focal length you are using so if shooting at 60mm, have a shutter speed faster than 1/60th of a second, if shooting at 200mm, make sure shutter speed is more than 1/200 of a second
These screw on the front of the plastic lens adapter and adjust the focal length. On the side of the adapter lenses it will quote the ratio. My wide angle says 0.66x so just multiply the range of focal lengths by this figure and you will see that it adjusts the camera zoom accordingly - making the image wider and probably also increasing the depth of field (what is in focus). Similarly a 1.5 tele will inrease the range of focal lengths to make the lens "longer" eg higher magnification , useful for astro photography - shots of the moon and terrestrial long distance work but detracting from the depth of field, eg the range of distance over which objects are in focus will be reduced.
The wide angle will allow you to come in close and get WIDE objects fully in-frame- hence "wide angle", while the telephoto will give you better overall maginification of the image but will probably increase the MINIMUM focal length - eg you may not be able to focus on objects closer than >2m (instead of ~1).
The screw-on adapter lenses I found were cheap in a Jessops sale use a 52mm thread, while the S5500 provides a 55mm internal thread. I use an appropriate 55mm to 52mm step down ring adapter. There is slight vignetting (shading around the edge of an image) at certain combinations of zoom, but generally these are very useful accessories.
As these are adapter lenses on the front of an already powerful 10x zoom that must be optically compromised at the price of this camera, there maybe some colour fringeing around bright images. If you want a better solution you really need to get a DSLR. Overall a good solution for the price.
In 1965 I did the same thing with a Nikon single focal length lens my F Photomic. This lens was far more simple then a modern AF zoom lens. I had to bite the bullet and pay a camera repair man to fix the lens. He told me that had I not tried to fix the lens myself, the repair would have cost 1/4. The only answer to your question is to take it to a camera repair man and get a quote. I would check the quote against the price of your lens on E-bay and use that to determine if you want to fix your lens or replace it.
By the way, it is very rare for dirt between elements to be so problematic that it results in a degradation of picture quality.