Filter Teleconverters - any good?

There are no positives, save your money towards a longer lens.
 
No, please give constructive feedback. They are £15 and double the zoom. I am basically wondering how much they degrade the image quality? If anyone has pictures to show it would be awesome, just saying it makes it bad quality means very little.
 
They will be totally uncorrected for CA, and poor ( if any ) coatings, and will give a poor end result. Glass that cheap is cheap for a reason. They've cut corners - big corners. Even quality teleconverters degrade the image to some degree. You are putting extra glass in the equation which wasnt meant to be there.

Unless you buy a quality built Telenconverter ( Kenko Pro, or Canon, Nikon, ) then i'd forget it and save your money.
 
Pros: Better than nothing.

Cons: not much better than nothing.

Save for a longer lens or A Tele convertor.
 
tomcraven said:
No, please give constructive feedback. They are £15 and double the zoom. I am basically wondering how much they degrade the image quality? If anyone has pictures to show it would be awesome, just saying it makes it bad quality means very little.
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They are crap,worthless junk. I'm trying to save you wasting your money. There is nothing constructive to say about them.

As you said they are £15 and double the zoom.. Wait so why the hell do people spend £1200 on a 70-200 if this thing can do the same thing for £15?

If you wanna waste your money go for it, I won't bother trying to help you anymore if that's the response.
 
I am just asking if they are worth £15, TCR4x4. I know they won't be anywhere near the quality of the actually lenses. But for instance, I have the Tamron 70-300mm f4-5.6. It will do 100mm at f4. With the converter that would allow 200mm at f4 instead of f4.8. Just wonder how much the quality would drop? I mean for £15 not compared to the £1k lenses :]
 
tomcraven said:
I am just asking if they are worth £15, TCR4x4. I know they won't be anywhere near the quality of the actually lenses. But for instance, I have the Tamron 70-300mm f4-5.6. It will do 100mm at f4. With the converter that would allow 200mm at f4 instead of f4.8. Just wonder how much the quality would drop? I mean for £15 not compared to the £1k lenses :]
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No such thing as a free lunch.
It will not be f4 at 200mm.
More like f8.
 
I got one of these and a wide angle equivalent with the kit when I started with a 550D. The wide angle one was the best of the two but it still was very poor. I got the 75-300 MkIII lens in the kit and I thought doubling that would be great. However the IQ was appalling, it was like looking through a mist and the distortion was awful.

This was taken with a 550D, 75-300 MkII at 300mm, 1/200sec, ISO400 and f6.3 and it was a nice, bright and clear day. Do you really want to risk it, I wouldn't pay 15pence for another one.

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tomcraven said:
I am just asking if they are worth £15, TCR4x4. I know they won't be anywhere near the quality of the actually lenses. But for instance, I have the Tamron 70-300mm f4-5.6. It will do 100mm at f4. With the converter that would allow 200mm at f4 instead of f4.8. Just wonder how much the quality would drop? I mean for £15 not compared to the £1k lenses :]
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No they arent worth £15.. The Tamron already isnt the sharpest lens in the world. Adding this will make most shots unusable, as per the example above.

Also its not a teleconverter despite what it says on it., its a magnifying glass. You'd get the same effect by taping a pair of binoculars to your lens.
 
tomcraven said:
I am just asking if they are worth £15, TCR4x4. I know they won't be anywhere near the quality of the actually lenses. But for instance, I have the Tamron 70-300mm f4-5.6. It will do 100mm at f4. With the converter that would allow 200mm at f4 instead of f4.8. Just wonder how much the quality would drop? I mean for £15 not compared to the £1k lenses :]
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Tom,

If this thing doubles your focal length then it's going to halve your effective aperture, can't be any better than that, plain and simple.

Smear some Vaseline on the front element of your Tamron and then crop your shots to half size.....I suspect the results will be similar or better than this "filter".

Bob
 
tomcraven said:
I am basically wondering how much they degrade the image quality
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A lot.

Actually, more than that.


Really, if they were any good do you not think that lots and lots of people would be using them? The fact that nobody would spend 15p on one should be a big clue.
 
....I think the question has now been answered lol :0)
 
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