Buy Cheap Canon TC-DC58C Tele Converter Lens for Canon A650IS, G7 & G9 Digital Cameras 
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- Converts the focal distance of the body lens to 420mm (2.0x) - at telephoto end when attached
- Requires Converson Lens Adapter LA-DC58H to attach this lens to the PowerShot G7
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"Useful but limited" 2010-01-27
By Paul Liesenberg (bay area, california)
first of all - you *do* get tunnel vision with this lens unless you are in the upper zoom range, and the canon manual acknowledges it. the menu setup option is just to optimize the way IS (image stabilization) works with the lens. i own a G9 and i doubt it behaves differently with the G7.
this takes you to a respectable 12x zoom, which is good for doing some nature work. the lens does affect picture quality some, i do notice some loss of resolution and contrast. and keep in mind it is much easier to get blurry pictures at this rate of zoom, IS or not - chances are you'll need a tripod or a hard surface to take optimal advantage of this and maximize picture quality. also, as you can imagine, it dwarfs the camera, so you will need a camera bag. having it dangling around your neck suspended while connected to Canon's plasticky adapter does not instill confidence. put it in a bag. :)
it just seems a tad overpriced for what it is, and at 25% of the camera value and with the fact it only operates in the upper zoom range i can not give it more than 3 stars.
"Great lense but very big for a little Camera G9" 2009-11-30
By D. TAWFEQ (illinois USA)
I love it but i am going to return it not because it is not good .. it does very good Job but this with the adapter make the Camera very heavy and unable to handle it my hands shaking when i hold the Camera but it does really an aweasom Job the only thing bothered me is the adapter big adapter with big lense increase the weight for the Camera ..
"Canon TC-DC58C" 2009-02-04
By P. Cobb
Together with required LADC58H converter this telephoto lens works as advertised. Read other reviews for performance, remembering that the G9 is not a DSLR. If you already have the G9 and would like to extend your telephoto capabilities with this camera, go for it. If you are considering buying a G9 or G10 and need the extra telephoto capabilities, you probably should take a closer look at DSLR's available within this price range for greater choice of options.
"Canon TC-DC58C + Sony DSC-H3 Perfect couple review." 2008-12-22
By Fabian Bono (Argentina)
I bought this Canon 2X Tele Lens to be used on my Sony DSC-H3 camera with 58mm mounting.
This is a perfect solution for Tele photos, the image is very clear and the size and weight of lens is more than affordable for this camera model.
I try several shoots also using digital zoom, where the final range go up to 32X (Camera 10X Optical + 6X Digital + 2X Converter) to take moon images, and the image clean and resolution is amazing.
The only detail to mention is that the lens don't have a front mount to install filters, very useful for landscape photo.
I highly recommend to all Sony DSC-H3/H10 users, to buy this lens.
"Good, but a couple of things would make it a lot better." 2008-09-07
By D. Polson (Des Moines, IA)
Maybe it can't be done, or maybe there isn't enough money in it, because if it could be done or if there were enough money in it, surely the Canon lens development engineers would have already done it to complement and enhance their very exceptional peerless point-and-shoot digital camera, the G9.
The Canon G9...used by photographic novices like myself who want more than only simple point-and-shoot good-but-not-great pictures, yet still want a digital camera of much better quality with more features and capabilities that takes great-not-good exceptionally high-resolution pictures, but want a camera is still relatively small and relatively light and relatively inexpensive, but aren't ready or willing to take the big step into the heavy-duty big league digital cameras used by serious professional photographers with seriously deep pockets or credit card balances) is not a good camera...it is a great camera.
The Canon TC-DC58C Teleconverter lens is a good quality accessory lens with very nice optics for the Canon G9 Digital Camera, and, yes, it does what a teleconverter lens is supposed to do - allow you to zoom even closer and take very nice high-resolution pictures when attached to the G9 of subjects and views that are far away.
The teleconverter lens attaches to the G9 via a required lens adapter. Canon offers a plastic lens adapter - the LA-DC58H, but don't buy it...it's plastic for crying out loud. Lensmate makes a much more durable aluminum Canon G9/G7 58mm lens adapter that is of MUCH better quality - [...]
So, that's all good, but there are two somewhat annoying things about this teleconverter lens:
[1] Why are there no threads on the business end of the lens to accomodate attachment of a UV filter to protect the lens? It certainly can't be a difficult thing to engineer. The absence of threads on the lens body so owners can put on a UV filter - my gosh, that has to be an inexpensive and simple beyond description thing to do - is a seriously glaring design deficiency.
[2] With the teleconverter lens attached and the G9 zoom pulled back it looks like you are looking down a black tube with the subject or view you want to get a shot of showing up as a circle in the center of the view - which, or course, you are looking down a black tube. To be fair, the reason you attach a teleconverter lens is so that you can use the zoom to get even closer to the subject or view you want to get a picture of, and the black tube effect does go away when you use the G9 zoom to get closer to what you want a shot of. And for that, the teleconverter lens works as it should and gives you really nice pictures of further way subjects and views that you can't get with the G9 alone. However, it would sure be handy and nice and appreciated if the creative and very smart Canon lens engineers would bring a teleconverter lens that would allow G9 users who have the teleconverter lens attached to have the flexibility to take full-field-of-view pictures with the zoom pulled all the way back, and then be able to use the lens for its real purpose of extending the G9's zoom for those further-away shots.
Maybe solving the looking-down-a-black-tube thing is too much to expect, maybe it is optically and physically impossible to resolve. And it that's the case, fine...if it is becomse so annoying that a G9 owner can't get past it then there is always the bigger camera - bigger bucks - bigger lens path to take.
All in all, and mainly because of these two things, this teleconverter lens is just sorta ok for an add-on lens for a "tweener" digital camera like the G9 that is easily the best of the point-and-shoot digitals but doesn't reach the level of the big-time digital SLR's.
But I am just sure there are a lot of creative and really smart engineers at Canon, and if the MBA bean-counters would let them, they could come up with a much better and more elegant solution to solve these two annoying things about their teleconverter lens and still extend the optical reach of the otherwise exceptionally excellent Canon G9 digital camera and show the MBA bean-counters at Canon that their overly conservative sales and revenue estimates for G9 teleconverter lens were way too low.
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Buy Canon TC-DC58C Tele Converter Lens for Canon A650IS, G7 & G9 Digital Cameras Now
