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Old May 25, 2006, 1:40 AM   #131
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Here is an update on my experiences with the Tamron 28-300XR. It's a GREAT lens, other than at apertures wider than 4.5. It is TERRIBLE at f3.5-4! I have taken quite a few comparison shots and this always holds true. There is almost a magical jump from 4.0 to 4.5. See these comparison shots (100% crop)

28mm f4.0:


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Old May 25, 2006, 1:46 AM   #132
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ssame shot 28 mm f4.5
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Old May 25, 2006, 1:52 AM   #133
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I am getting the same results over and over EXCEPT when I shoot with the internal flash where the differences are not as pronounced. Weird.

Here, by the way, is the same shot at 28mm f4.0 taken with the Tamron 28-200 lens.


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Old May 25, 2006, 1:57 AM   #134
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In case anyone says this is a focusing or some other issue. here are some comps with another subject. Tamron 28-300 at f3.5:


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Old May 25, 2006, 1:58 AM   #135
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Tamron 28-200 at f4
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Old May 25, 2006, 2:00 AM   #136
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So, it's best to not go below 4.5 ever on the Tamron 28-300. Has anybody else different results?
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Old May 25, 2006, 2:00 AM   #137
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So, it's best to not go below 4.5 ever on the Tamron 28-300. Has anybody else different results?

Rainer

http://euromaninla.zoto.com/galleries
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Old May 25, 2006, 9:26 AM   #138
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rduve wrote:
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So, it's best to not go below 4.5 ever on the Tamron 28-300. Has anybody else different results?

Rainer

http://euromaninla.zoto.com/galleries
Rainer,



I took a set of pictures at 28mm 3.5/4/4.5, and I see a slight difference, but not as much as yours. My gas meter has a stamped steel regulator as opposed to the cast iron on yours, so there isn't as much texture. I also took a set at 35mm, and the difference is almost non-existant. I also see a greater contrast at full size as opposed to re-sized for web posting. Try the same shots at 35mm and see what you get.
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Old May 25, 2006, 11:40 AM   #139
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I will try shooting some more. My results have been pretty consistent. Maybe it's just bad luck that the focus is always off in those wider apertures. Will test some more this weekend.
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Old May 25, 2006, 2:42 PM   #140
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rduve wrote:
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So, it's best to not go below 4.5 ever on the Tamron 28-300. Has anybody else different results?





The shot of the bicycle at 4.0 looks good
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