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10-07-2013, 06:44 AM   #556
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QuoteOriginally posted by sledger Quote
OK, thanks.. Obviously you must be right as you have a K-5. But I did check dpr before I posted the question and found that their published specs don't support this, they list 100 ISO as the lowest for the K5 range.
the ISO 80 and ISO above 12800 are called "extended" but they are available in every mode. You have to enable them from the menu. Just turn the option on and it is enabled. Maybe some sites list 100-12800 because they think some ISO are not available in every mode or somehow restricted. They are. Not restricted.

10-07-2013, 07:08 AM   #557
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Right, so you're talking about 'pull ISO' which is in camera trickery, not real native ISO at all
('Push ISO' is extended ISO above the maximum native rating).
10-07-2013, 07:11 AM   #558
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QuoteOriginally posted by sledger Quote
Right, so you're talking about 'pull ISO' which is in camera trickery, not real native ISO at all
('Push ISO' is extended ISO above the maximum native rating).
I am not sure... I think the iso 80 is not native but "stepped down" from ISO 100... but i think ISO 51200 is native to k-5... but i am not sure. please ask someone who knows about this... ^^
10-07-2013, 07:14 AM   #559
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QuoteOriginally posted by sledger Quote
Right, so you're talking about 'pull ISO' which is in camera trickery, not real native ISO at all
('Push ISO' is extended ISO above the maximum native rating).
It's hard to tell, but the general consensus seems to be that ISO80 does have a slightly larger DR than ISO100 on the K-5's sensor. So it's not really trickery to enable slightly longer exposures. I for one always have my K-5 on ISO80 per default.

Wim

10-07-2013, 07:19 AM   #560
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Found an article which explains it better than I can
ISO: Native Vs Extended | Roberts Raw! Camera News, Advice, And Learning
10-07-2013, 07:26 AM   #561
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QuoteOriginally posted by sledger Quote
Found an article which explains it better than I can
ISO: Native Vs Extended | Roberts Raw! Camera News, Advice, And Learning
Exactly, except that on my K-5 ISO80 never has more highlight clipping than ISO100, on the contrary...

I'm inclined to think that the native ISO is actually ISO80, but since it's not a "standard" ISO this was ignored by other manufacturers and implemented as a ISO100 instead (or not ignored but called ISO100). Typical Pentax to make it available as an extended option anyway, or call it the ISO80 it actually is.

It's an old discussion anyway. What's important is what's the actual base ISO for this new sensor. If it's really ISO100, there's no point in pulling it to lower ISOs in the extended range. You might just as well overexpose and pull exposure in PP.

Wim
10-07-2013, 07:31 AM   #562
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The native base iso of the K5 sensor is about 70 or 75. If you look at the Nikon D7000, DXO mark tested their iso 100 as being the same (iso 80-ish), so it is just that Pentax chooses to be "honest" with the base iso of the sensor, while Nikon inflates their isos all the way down the line.

Not sure though, why the K5 had more dynamic range than the D7000.
10-07-2013, 07:39 AM   #563
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I guess that regardless I hope to see more dynamic range on this new one. It seems to address a couple issues I have with my K5, so I may get one come January or February.

10-07-2013, 08:17 AM   #564
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QuoteOriginally posted by sledger Quote
OK, thanks.. Obviously you must be right as you have a K-5. But I did check dpr before I posted the question and found that their published specs don't support this, they list 100 ISO as the lowest for the K5 range.
It's an 'extended range' option. As such it might be in the K-3 but we'll see. I'd rather have ISO 20 than ISO51200 myself.
10-07-2013, 08:21 AM   #565
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QuoteOriginally posted by ElJamoquio Quote
It's an 'extended range' option. As such it might be in the K-3 but we'll see. I'd rather have ISO 20 than ISO51200 myself.
i would rather have lower iso too... the higher ISO are so noisy in k-5... unuseable. lower ISO would be useable... useful!
10-07-2013, 08:54 AM   #566
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I wonder if base iso was lower if it would make the ceiling iso lower as well. That is if your base iso was 25, then photos would start to look crappy at iso 600. I certainly wouldn't want that. I do use iso 6400 at times, just as I use iso 80.
10-07-2013, 08:57 AM   #567
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QuoteOriginally posted by pentaxk10duser Quote
Mistral75 .So do you have to use special lens that has what your talking about in the lens and a built in motor in the lens for video to make your Camera work right as a video camera to get auto focusing as good as regular video devices.
Yes, the quietest and smoothest autofocus in video mode is provided by lenses, the built-in motor of which is a stepper motor.
10-07-2013, 01:27 PM   #568
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I think i would be keen on ISO less than 50 from the longer exposure standpoint without the need for ND filters. Just so i can drag the shutter that extra bit longer or stay out of diffraction zones on a lens. The number of times i have seen a shot but left the ND at home, thus not being able to capture it, are starting to tally up.
10-07-2013, 01:55 PM   #569
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QuoteOriginally posted by Chaos_Realm Quote
I think i would be keen on ISO less than 50 from the longer exposure standpoint without the need for ND filters. Just so i can drag the shutter that extra bit longer or stay out of diffraction zones on a lens. The number of times i have seen a shot but left the ND at home, thus not being able to capture it, are starting to tally up.
Yes. I carry a 2-stop ND filter for exactly this reason. Mainly for studio work, because my studio is small and it is sometimes hard to avoid pushing my lenses to f/11 or smaller.
10-07-2013, 04:22 PM   #570
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Well, speculation can end now!
Pentax K-3 Announced - Pentax News - PentaxForums.com
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