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03-07-2010, 01:32 PM   #1
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Which is the best teleconverter?

I actually own a few 3'rd party x2's, but I'd like to get something a little more serious. So I was wondering which version and factor would be regarded as the best converter for serious use?

ie.

2X
1.7X
1.5X
1.4X

And of course what model or brand also
I'm looking to mate something to an old *300mm and possibly a 135mm 2.8 lens mostly.

03-07-2010, 01:41 PM   #2
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I use the Pentax 1.7x on my F* 300mm f4.5.
Had the Tamron 1.4x and that wasn't bad but the 1.7x is slightly better and with more IQ imo.

I use the Pentax 1.4x-L and 2x-L on a A* 300mm f2.8 and they are superb but will not fit my 300mm f4.5.
03-07-2010, 02:37 PM   #3
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Original Poster
QuoteOriginally posted by Mike.P Quote
I use the Pentax 1.7x on my F* 300mm f4.5.
Had the Tamron 1.4x and that wasn't bad but the 1.7x is slightly better and with more IQ imo.

I use the Pentax 1.4x-L and 2x-L on a A* 300mm f2.8 and they are superb but will not fit my 300mm f4.5.
Sounds interesting!
I should have mentioned that my *300 is manual, so I never really considered the AF contacts etc.
From an optical stand-point, would you say that the 1.4x is better than the 1.7x?
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