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03-18-2010, 05:17 PM   #1
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Marrying a KX to a Sigma 150-500

I'm looking for a bit more flexibility in High ISO to bump up the late afternoon shutter speeds for sharper pics with my Sigma 150-500. Right now, pushing it to 800 with the K20 or K200 still keeps the shutter speeds lower than I would like.

Do you think I would be able to get something higher than 800 with a KX that would still give sharp results? This would be used mostly for birds by the way. 1600 would probably be the top end I would need and still give fast enough shutter speeds.

What do you think? Good or bad idea?

Al

03-18-2010, 07:01 PM   #2
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Good idea, imho.

The K-x goes very well with telephoto lens usage and will give you good IQ results at 1600 and even up to 3200 out-of-the box. With a bit of tweaking in PP even 6400 can be usable.

The K-x AF is also more responsive than the K200D.

Some bird samples at 1600 ISO and above.

1600 ISO butcherbird


3200 ISO magpie (horrible overcast day, needs some PP)


6400 ISO magpie (ditto horrible overcast day needs some PP but still good detail and shadows)
03-18-2010, 07:44 PM   #3
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That is one of the reasons I swapped my K20D for a Kx. I wanted the extra 1-2 stops. So far it's paying off in spades. It also seems a bit sharper.
03-18-2010, 07:47 PM   #4
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Thanks very much for the photos. This is what I am leaning towards. I think it will be a very good match to this lens.

Al

03-19-2010, 07:29 AM   #5
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A couple below... Cropped pretty heavily but still look pretty good after a bit of PP. Having the extra range gives me a lot more flexiblity with location and lighting.

Titmouse at ISO 1600. Tight crop.


Dove at 800. Not real high iso but much better than my K20D performed.
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