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11-28-2011, 12:18 PM   #1
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ISO range - expanded?

Hi guys - the K-r has ISO range listed as 200 - 12800 (100 - 25600), so my question is why is it listed that way and not 100-25600?

Is that because the sensor is only supporting ISO 200-12800 natively and the "expanded" ISO range is done through software? If that's the case then does that mean shooting at ISO 100 is not as good as those provided by K10D or K20D?

K-r is really tempting me...

11-28-2011, 12:25 PM   #2
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QuoteOriginally posted by ducdao Quote
Hi guys - the K-r has ISO range listed as 200 - 12800 (100 - 25600), so my question is why is it listed that way and not 100-25600?

Is that because the sensor is only supporting ISO 200-12800 natively and the "expanded" ISO range is done through software? If that's the case then does that mean shooting at ISO 100 is not as good as those provided by K10D or K20D?

K-r is really tempting me...
Isn't the K-5's expanded ISO range 80 and 25600+
Anyways, based on my own tests, ISO80 produces the highest detail and grain quality of any other sensitivity and dynamic range latitude.

PS. no clue why Camera manufacturers offer expanded sensitivity options, but they all seem to do this.
11-28-2011, 12:30 PM   #3
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QuoteOriginally posted by JohnBee Quote
Isn't the K-5's expanded ISO range 80 and 25600+
Anyways, based on my own tests, ISO80 produces the highest detail and grain quality of any other sensitivity and dynamic range latitude.

PS. no clue why Camera manufacturers offer expanded sensitivity options, but they all seem to do this.
Yah the K-5 is listed as 100 - 12800 (80 - 51200), so up to 51200!

The word "expanded" really bothers me right now. K-5, although under a grand, is way beyond my budget. Would really love to have it but can't afford at the moment. K-r is then the only viable option for low light shooting.
11-28-2011, 12:32 PM   #4
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It is done through software, and it does work very well. The main restriction is that to use highlight correction (also a software function) you can't also use expanded sensitivity at the same time. It's up to you which function serves you better. If you're not using ISO 100, you could as well have highlight correction on, but personally I prefer to have ISO 100 available, and use it or 200 most of the time.

11-29-2011, 02:10 PM   #5
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Here is discussion on ISOs (See DXO Charts for more info)
https://www.pentaxforums.com/forums/pentax-k-r-forum/154829-what-iso-do-you-u...ml#post1608456
11-29-2011, 02:16 PM   #6
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There's nothing wrong with using the expanded range but I guess that manufacturers want to say that if you venture into those parts you might not get the best results (low isos - b/c of a high light requirement, and high isos because of noise). They certainly work well and deliver good results, though!
11-30-2011, 11:37 AM   #7
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OK you guys have convinced me. Just pulled the trigger on an used but babied K-r. Will do intensive testing later this week-end. So far so good. It feels so small and "fragile" compared to my K20D.
11-30-2011, 11:41 AM   #8
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Congrats, hope you enjoy it. The K-r is not what I'd call fragile, but I've heard others say the K20D is built like a tank.

11-30-2011, 11:45 AM   #9
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QuoteOriginally posted by Philoslothical Quote
Congrats, hope you enjoy it. The K-r is not what I'd call fragile, but I've heard others say the K20D is built like a tank.
You're probably right. Coming from K200D, K10D and K20D I'll probably consider all non-WR bodies as "fragile"
11-30-2011, 09:34 PM   #10
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QuoteOriginally posted by ducdao Quote
Yah the K-5 is listed as 100 - 12800 (80 - 51200), so up to 51200!

The word "expanded" really bothers me right now. K-5, although under a grand, is way beyond my budget. Would really love to have it but can't afford at the moment. K-r is then the only viable option for low light shooting.

HSN currently has the K-5 available on FlexPay. 4 payments of $337.49

PENTAX K-5 16MP Digital SLR Camera with Carrying Bag at HSN.com
12-04-2011, 11:28 PM   #11
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QuoteOriginally posted by ducdao Quote
Yah the K-5 is listed as 100 - 12800 (80 - 51200), so up to 51200!

The word "expanded" really bothers me right now. K-5, although under a grand, is way beyond my budget. Would really love to have it but can't afford at the moment. K-r is then the only viable option for low light shooting.
humn..i just learned about "expanding sensitivity" using 100-25600 in my K-R. now i feels like i want to stick to the factory setting of iso 200-12800. can anyone tells me if i should be bothered if il use ISO 100 in my shots?
12-05-2011, 12:04 AM   #12
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QuoteOriginally posted by Allenation Quote
humn..i just learned about "expanding sensitivity" using 100-25600 in my K-R. now i feels like i want to stick to the factory setting of iso 200-12800. can anyone tells me if i should be bothered if il use ISO 100 in my shots?

ISO100 is nice to have available as it offers better color saturation than ISO200 in bright light situations.
12-05-2011, 04:56 AM   #13
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QuoteOriginally posted by Allenation Quote
humn..i just learned about "expanding sensitivity" using 100-25600 in my K-R. now i feels like i want to stick to the factory setting of iso 200-12800. can anyone tells me if i should be bothered if il use ISO 100 in my shots?
I think there are two things about iso 100. First of all, per Dxo Mark, the dynamic range with iso 100 is better than the dynamic range with iso 200, so whether or not it is done with software, it does provide some improved DR. Second, there are times where you want a slower shutter speed than what you can get with iso 200 and there you definitely want to be able to drop to iso 100.
12-05-2011, 06:43 AM   #14
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QuoteOriginally posted by TechGuru Quote
ISO100 is nice to have available as it offers better color saturation than ISO200 in bright light situations.
QuoteOriginally posted by Rondec Quote
I think there are two things about iso 100. First of all, per Dxo Mark, the dynamic range with iso 100 is better than the dynamic range with iso 200, so whether or not it is done with software, it does provide some improved DR. Second, there are times where you want a slower shutter speed than what you can get with iso 200 and there you definitely want to be able to drop to iso 100.
Thanks, guys. I do realize ISO100 handles noise and DR much better than ISO200, my point was I would prefer to have ISO100 supported at hardware level rather than software level.
12-06-2011, 10:44 AM   #15
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QuoteOriginally posted by TechGuru Quote
ISO100 is nice to have available as it offers better color saturation than ISO200 in bright light situations.

QuoteOriginally posted by Rondec Quote
I think there are two things about iso 100. First of all, per Dxo Mark, the dynamic range with iso 100 is better than the dynamic range with iso 200, so whether or not it is done with software, it does provide some improved DR. Second, there are times where you want a slower shutter speed than what you can get with iso 200 and there you definitely want to be able to drop to iso 100.
thank you sirs!

it was a great help! i am totally relieve with your insights.

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