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Old Jan 2, 2007, 1:36 PM   #11
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Donna,

i got a Kenko 1.4x for Christmas... supposedly made by the same folks who make Tamron, but it's cheaper (~ $125). as everyone else has mentioned, it does cost a stop - an f5.6 telephotolens becomes f6.3 - but more critically, like all converters,it costs sharpness and contrast. in bright light it's okay, but the minute the light even gets "flat" (as on an overcast day), much less dim, it starts to lose contrast and clarity, and the AF starts to become unreliable. even in good light, theAF with my Sigma 80-400 isnot as fast or accurate with the converter on; some shots are perfect, others are not so clear. frankly, at this point, i'd reservethe use of any converter for those times when you have good light, and simply cannot get the shot without the extra "reach"...
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Old Jan 2, 2007, 2:10 PM   #12
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It seems like everyone agrees on this. I will start saving my money for a longer, brighter lens. Donna
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Old Jan 2, 2007, 2:46 PM   #13
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Hi Donna - My 2 cents....

While I agree with all of the above (I have a 2x tamaron), I am coming to the conclusion that with 10mp's +/-, I get better final images without the tc on and just cropping alot in ps. Taking a shot without the tc and enlarging it to match the shot with the tc, the non-tc shot is almost always sharper, at least for me. I don't know if the same would be true with a 1.4, probably not as much.
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Old Jan 2, 2007, 3:24 PM   #14
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D.Ann wrote:
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It seems like everyone agrees on this. I will start saving my money for a longer, brighter lens. Donna
Donna, which 300mm do you have now?
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Old Jan 2, 2007, 5:00 PM   #15
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I have an EF 70-300mm f/4-5.6.
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