Interresting about the color shift. I inevitably tweak the WB when processing 
raw files, bu thaven't noticed any lenses with consistent color shifts. The 
only 
other Sigma glass tha ti use much is the 70-200 f2.8, and I haven't noticed any 
color shifts with it...



----- Original Message ----
From: Boris Liberman <[email protected]>
To: Pentax-Discuss Mail List <[email protected]>
Sent: Fri, June 10, 2011 12:00:20 AM
Subject: Re: Sigma 150mm macro lens

On 6/10/2011 05:28, Mark Cassino wrote:
> Any thoughts on the Sigma 150 or other options that might be out there?

Mark, if you get to buy a Sigma, I will be most curious to know how you'd 
compare the color rendering of both lenses. Initially I did not notice it, but 
Tamron 28-75 and Sigma 24-60 yield different colors - Tamron being the warmer 
and Sigma being a bit odd for I lack words to describe it in a way that would 
make sense. The best I can do is say that it seems to eat up a bit of yellow 
and 
that general aspect of rendering is a bit lifeless. Not terribly so, but 
still... May be since introduction of Sigma 24-60 they did improve on their 
coatings a fair bit, I don't know but I'd certain want to hear your opinion on 
the matter if and when you get a Sigma.

Boris

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