Just searched the web and found I'm not alone:
http://falklumo.blogspot.com/2011/03/lumolabs-pentax-k-5-low-light-focus.html
http://www.fredmiranda.com/forum/topic/1065576
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> An interesting point I hadn't thought of. However, I haven't really
> bought into it yet. It seems to me that tungsten light would restrict
> the range of colors that the lens sees to that toward the red end of the
> spectrum. If the lens suffers from chroma I should think it would be
> worse in sunlight with a full spectrum from red to blue.
>
> Chuck Norcutt
>
>
> On 2/6/2012 2:34 PM, Chris Crawford wrote:
>> His focus shift with tungsten is probably caused by Chromatic abberation.
>> If the lens were apochromatic, it wouldn't do that.
>>
--
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