I've shot extensively with both K5 and K3. A 2EV push creates some shadow 
noise. If you're okay with that it's fine, but I find I can retain highlights 
at a correct or nearly correct exposure. Of course how one meters has a lot to 
do with that.

Paul via phone

> On May 19, 2016, at 6:47 AM, Zos Xavius <[email protected]> wrote:
> 
> The K-3 and K-5 can easily sustain a 2ev boost in the shadows. The K-5
> more so. I underexpose by 2ev quite often to retain highlights and
> push in post.
> 
>> On Thu, May 19, 2016 at 12:49 AM, Paul Stenquist <[email protected]> wrote:
>> You would. Although there can be times when slight underexposure is a plus 
>> in that it can help extend the high end range. But more than a stop is just 
>> wanking.
>> 
>> Paul via phone
>> 
>> On May 19, 2016, at 12:42 AM, Ken Waller <[email protected]> wrote:
>> 
>>>> Lightroom only allows a few stops of exposure compensation, and it is very 
>>>> easy to exceed that range.
>>> 
>>> Why wouldn't you try to get the exposure right in camera ?
>>> 
>>> Kenneth Waller
>>> http://www.pentaxphotogallery.com/kennethwaller
>>> 
>>> ----- Original Message ----- From: "Larry Colen" <[email protected]>
>>> Subject: Re: Can higher ISO give you more info about a low contrast scene.
>>> 
>>> 
>>>> 
>>>> 
>>>> Mark Roberts wrote:
>>>>> Larry Colen wrote:
>>>>> 
>>>>>> 
>>>>>>> On May 18, 2016 1:13:42 PM PDT, Mark 
>>>>>>> Roberts<[email protected]> wrote:
>>>>>>> I know most recent Pentax cameras are ISO invariant and I expect the
>>>>>>> K-1 is, also.
>>>>>> Does this mean that you don't get any advantage from shooting a higher 
>>>>>> iso rather than under exposing at a lower ISO?
>>>>> 
>>>>> https://medium.com/@simonfuhrmann/iso-invariance-in-digital-cameras-a-case-study-7080791b5e78
>>>>> http://improvephotography.com/34818/iso-invariance/
>>>>> http://www.dpreview.com/articles/7450523388/sony-alpha-7r-ii-real-world-iso-invariance-study
>>>> 
>>>> Very interesting. I'll have to study these in more depth when I'm not 
>>>> packing for a track day.  Thanks.
>>>> 
>>>> I can think of one reason to not just shoot at base ISO.  Lightroom only 
>>>> allows a few stops of exposure compensation, and it is very easy to exceed 
>>>> that range.
>>>> 
>>>> It does seem, however, that there is little downside to picking an 
>>>> exposure triangle in manual, that may be a stop or two under to preserve 
>>>> highlights, and effectively do your Tav adjustment in post.  This will be 
>>>> very helpful when photographing at the dojo.
>>>> 
>>>> I have noticed that when I bracketed in Tav mode, by the time I finished 
>>>> adjustments the differences between the exposures were very subtle.  Now I 
>>>> better understand why.
>>>> 
>>>> There is some fun physics to learn here in order to optimize sensor 
>>>> performance.
>>>> 
>>>> 
>>>> --
>>>> Larry Colen  [email protected] (postbox on min4est) http://red4est.com/lrc
>>> 
>>> 
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