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>  forums  >  All cameras  >  Extension tubes, teleconverters, etc
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Johnny 
Extension tubes, teleconverters, etc
11 Apr 2007 at 03:44 GMT
number of posts: 43
member since: 30 Apr 06
location: us

status: offline
What do they all do and are they too good to be true?

I dont understand much about them seeing I've never cared to read about them, but from what I understand a 300mm with a 2x teleconverter could become 600mm. This sounds too good to be true.

The extension tubes allow any lens to become somewhat a macro lens by adding more room between the lens and the camera.

My question, is my information accurate? And are they really as good as they sound? Are teleconverters and extension tubes the inexpensive way of getting your lenses to do great things?

Thanks
 
re: Extension tubes, teleconverters, etc
7 Feb 2008 at 14:41 GMT
number of posts: 4
member since:
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status: offline
Just joined so excuse the lateness of this reply.
Yes a 2X converter will double the focal length of the lens but the down side is the drop of in apperture, a f4 become f8 so is much slower.
Extension tubes certainly delver the macro goods on some lenses, but remember the DOF becomes miniscule, in some cases >1mm even at small appertures


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