Tamron 28-75mm vs Sigma 24-70 for Pentax?

Tayfun

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Hi everybody;
I want to buy one of the following lenses to use on my Pentax K10D;

1. Sigma 24-70 F/2.8 EX DG Macro
2. Tamron SP AF 28-75mm F/2.8 XR Di LD

I've searched both of them and I am sure both are good enough for me. Generally it is said that Tamron was slightly better optically but built quality of Sigma was better. I will use it as a walk around lens. Is there anyone used both or just can give an advice about it?
 

Don Simon

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The Tamron generally gets better reviews... but its 28mm at the widest end, while the Sigma is 24mm. 4mm may not sound like a huge difference, but in wide-angles it is a significant difference... and 24mm on a digital SLR will still be a moderate wide-angle, just... the 28mm won't be. I'd consider whether 28mm is wide enough for a walk-around lens... if so, get that... if not, get the Sigma or look elsewhere. Personally I would want a walkaround zoom to go wider than either, but that's just me.
 

Johnboy2978

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I have the Sigma 24-70 EX f/2.8 and like it very much. I find the optical quality to be very good. OTOH, I've never used the Tamron, so I really can't compare it w/ that one.
 

Stranger

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I own the tamron and love it.. I've never heard or seen anything from the sigma though.

I sometimes wish i would have gone with the Tamron 17-55 though, to give you another thought.

I was going to sell the 28-75 and make the swap but decided i will just buy the 10-20 this summer and be happy
 
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Tayfun

Tayfun

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Hi all;
Johnyboy, as you mentioned before I know you have the sigma and acc. to your advice I took sigma to account, and as Zaphod says extra 4mm wide angle seems to be nice. The idea of Tamron of mine was that I have also the kit lens 18-55 of Pentax so by Tamron 24-75 I will have wider range. Also I think if I buy Tamron 24-75, secondly I decide to buy sigma 15-30 which will complete that range. Does it seem ok? or do I miss something very badly:) Thanks to you all because of your advices.
Also I want to ask if anybody knows that does tamron 17-50 have suitible mount for Pentax? In its website it seems like that it isn't suitible by Pentax.
 

Don Simon

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Sorry no, the Tamron 17-50mm f/2.8 isn't being made for Pentax yet. You can try the Sigma equivalent 18-50mm f/2.8 (or of course the Pentax 16-50 if your budget allows).
 

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