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11-25-2007, 01:38 PM   #1
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a dumb ?

Hi Folks...
Ok, here is my question..
About 8 months ago I purchased this lens. AF28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro; Tamron USA, Inc.
It worked ok, but very soft after 275mm

Well, about a month ago I purchased this lens.
Sigma - Lenses
Why, because I thought the Sigma would be a better lens as all my other sigma lens are really nice and am very happy with them...Besides the sigma lens looks very cool...Anyway, the sigma lens was simply awful everyplace but at 29-150mm, so I took it back and exchanged it figuring I got a bad one...Well, the replacement was the same bad lens, so I shelved it...Well, I was pondering the two lenses and thinking, that both have the same specs but the tamron rocks the sigma...Well i decided to compare the two visually and what I found was the glass on the tamron is larger by quite a bit...This to me explains the better quality of the Tamron but wonder how both can have the same specs...??
Here is a picture...
Thanks for reading my rant...



11-25-2007, 02:30 PM   #2
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Tamron seems to do a good job on everything they make. I bought a 28-200..kinda costly $300ish. but it really light and never gave me any significant problems.

Could be the case of Sigma doing what canon does..lol.
11-25-2007, 07:00 PM   #3
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QuoteQuote:
I found was the glass on the tamron is larger by quite a bit...This to me explains the better quality of the Tamron but wonder how both can have the same specs...??
A) The size of the rear element is not the one that limits the aperture.
B) The size of the rear element does not determine quality.
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