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11-19-2010, 06:24 PM   #16
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QuoteOriginally posted by amvic Quote
I suppose that's my question: did Pentax change something under the hood, or do I need to exchange my new K5 body because there's something wrong with it?
The K-5 definitely has something different from the K-7, it has a new AF system.
Most probably Sigma can help you with the problem, because they reverse engineer their lenses to fit Pentax. They may not have the solution at hand right new, becase the K-5 is so now...

A bit of a bummer for the moment I guess..

11-19-2010, 07:12 PM   #17
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Over the weekend I will check accuracy of my Sigma 8-16mm HSM. I mounted it last night on my new K5... and I'm not convinced it was as sharp as it could be. But I was shooting long exposures at night, so I can't say for sure whether it was the combination of K5 and lens or whether my low light focusing skills or tripod vibration caused it to come up short.

That lens performed just fine on the K10D almost every time -- although, to be honest, I've had it go askew at night occasionally, possibly due to the K10D struggling to focus in low light.

Last edited by bats; 11-19-2010 at 07:47 PM.
11-19-2010, 09:24 PM   #18
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QuoteOriginally posted by farhagh Quote
So in all of the cases above it's not about Sigma, neither the K-5. It could be any combination.

I have the non HSF version of this lens and it needed huge amounts of compensation on my K10D and NONE on my K20D. I've got Pentax lenses that needed NONE on my K10D and were off the scale on my K20D

I've actually had to go into debug mode on the K20D and shift it to the +/-10 accommodated every lens.

It's not an exact science. My K10D is permanently in debug mode so I can change settings on the fly.

They should implement a +/-20 for wider scope IMO
11-20-2010, 12:18 PM   #19
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QuoteOriginally posted by Smeggypants Quote

They should implement a +/-20 for wider scope IMO
You get my vote.


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