Product Description
Channel Vision is a manufacturer and marketer of electronic home entertainment, surveillance and information technology products. The Channel Vision brand means high quality in concept, features, and design.PRODUCT FEATURES:6-way splitter/combiner, 1GHz, DC pass all port (bulk pack-poly bag);9.0dB insertion loss;Machine threads;Grounding screw.
Product Description
1 GHz Female 75 ohm input/output connections DC pass all ports
Product Description
100-300mm ultrasonic zoom lens for Canon cameras
Amazon.com Product Description
The Canon EF 100-300mm lens completes a fusion of state-of-the-art electronics, mechanical precision, and optical excellence. The fully electronic EF lens mount is unique among 35mm SLR cameras, operating silently and reliably due to the complete elimination of mechanical couplings. It has a custom- designed autofocus motor and microprocessor, and employs ultrasonic motor technology, aspherical lens elements, flourite crystal and ultralow-dispersion glass. The EF 100-300mm is designed for use with all EOS cameras, allows auto and manual focus modes, rear focusing system, and has an affordable price.
Customer Reviews:
Super lens........2007-05-07
This is a great lens for most longer shots. Works well with my Canon 30D for most shots I have wanted to take. Fairly fast focus. Have used it for indoor gymnastics meets and baseball shots.
Big step up on the 75-300 .......2007-03-28
The Canon EF 100-300 f/4.5-5.6 USM is the best entry level 300mm zoom lens. In order to do any better you have to get into Canon's L line which means a lot more money. Many people, including myself, start off with Canon's EF 75-300 f/4-5.6 III USM because of the low price. This lens won't break the bank but is definitely worth the difference. The build quality is much better on the 100-300. Also I have found this lens to be sharper. Along with that, this one has ring-type USM instead of micro USM so it focuses faster and quieter while allowing full time manual focus--you can manually adjust the focus without having to switch between AF and MF. Also, since it uses internal focusing, the front of the lens doesn't rotate or extend when focusing so it is easier to use a circular polarizer. For the money, you can't beat this lens.
EF 100-300/4.5-5.6 Canon.......2007-02-20
This is an excellant lens for the reasonable price. A little soft at the high end of of the scale, but since its use is on a Canon DSLR there is alot of capacity and I seldom need to go that high. It matches well with my EF 28-105/3.5-4.5 lens.
Not bad...not bad at all.......2006-09-08
I bought this lens along with a couple of other Canon "prosumer" zooms several years ago when I switched from Nikon to Canon SLR's. I hadn't used it much until I recently rediscovered how useful it is.
See, I have the venerable 70-200/2.8L. That lens is truly outstanding. I use it a lot with the Canon EF 1.4X Extender which makes the 70-200 into a 98-280 f/4 zoom. When I got the 70-200, I pretty much stopped using the 100-300.
I recently realized that I carry the 70-200 around more than I actually use it. My most used lenses are in the normal to wide range unless I have a special purpose in mind that requires a longer focal length lens. But sometimes opprotunity presents the need for a long lens when you least expect it and, even though I was never a Boy Scout, I do like being prepared. The 100-300 is smaller and lighter than the 70-200/2.8L. It's a pretty sharp lens if you recognize its limitations. Limitations include being a notch or two down in sharpness at the 300mm end of the zoom range unless you stop it down to around f/11. At 200mm or shorter, it performs well even at maximum aperture even though it's not up to "L-series" optical quality.
It's not "L-series" quality in build either. It has a plastic barrel and the manual focusing ring was an afterthought. It grows in physical size when zoomed to the longer focal lengths. It sucks in dust by doing this (I have lots of speckles inside my lens to show this--but they have no affect on image quality). It also has an annoying tendency to zoom itself back and forth by its own weight. I carry a large rubber band around to keep this from happening if for some reason I use the lens on a tripod and tilt it up or down.
I like this lens more today than I did when I first bought it, despite the fact that the 70-200/2.8 is a much better lens on all fronts.
so so.......2005-08-04
at 300mm it is quite noisy rendering any professional use out the door. Great at 200mm and below not really worth the price
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