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12-21-2009, 07:36 PM   #1
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ISO 100 question

Sorry about this basic quesion. I learned that K-7 has ISO100, where other models such as K-x has ISO 200, or should I say, it starts with ISO200.

Question is, what is the advantage of having ISO 100? is this something that is a "MUST" for someone who takes pictures of family, vacations, etc?

12-21-2009, 08:17 PM   #2
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If you're asking the question, get the Kx.

No it's just the base ISo of the sensor, 100 is useful for slow shutter speeds in brigh tlight, think waterfalls .... otherwise you won't miss it.

Honestly, it's item number 12,000 in terms of pecking order of things you need to worry about
12-21-2009, 09:41 PM   #3
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Thanks.

Why is it so hard to get a new K20K? It was 2008 model and I cant find a new one anywhere?
12-21-2009, 09:42 PM   #4
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QuoteOriginally posted by pakuchn Quote
Thanks.

Why is it so hard to get a new K20K? It was 2008 model and I cant find a new one anywhere?
Because it's discontinued.

12-22-2009, 06:42 AM   #5
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QuoteOriginally posted by pakuchn Quote
Thanks.

Why is it so hard to get a new K20K? It was 2008 model and I cant find a new one anywhere?
See th emarketplace, $600 and it's yours.
12-22-2009, 07:02 AM   #6
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it's worth having iso100. heck, i wish pentax would release a pro-ish body with iso50.
12-22-2009, 07:39 AM   #7
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The base ISO being 100 or 200 would not be a factor in my decision. The two cameras are quite different and, for me, the ISO is the least significant.

If the shutter speed you want to use or the f/stop you want to use would work better with ISO 100 than ISO 200, use a polarizing or ND filter.
12-22-2009, 08:51 AM   #8
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QuoteOriginally posted by patrickt Quote
The base ISO being 100 or 200 would not be a factor in my decision. The two cameras are quite different and, for me, the ISO is the least significant.

If the shutter speed you want to use or the f/stop you want to use would work better with ISO 100 than ISO 200, use a polarizing or ND filter.
well that's odd. buying a gimped tool is just silly imo.

12-23-2009, 11:55 AM   #9
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The K-x does have ISO100. Just change the iso expanded range option. Theoretically all else being equal, iso 100 would give you a less noise photo than a 200 correct??
12-23-2009, 12:21 PM   #10
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Since I used the *istD for so long that has a low limit of ISO 200, I always use 200 as my base anyway on all my cameras....

No noise is no noise.... why not take advantage a little more sensitivity?
12-23-2009, 12:44 PM   #11
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Can I assume that K-x is better at light light when compared to D20K?
12-23-2009, 01:03 PM   #12
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QuoteOriginally posted by skid2964 Quote
Since I used the *istD for so long that has a low limit of ISO 200, I always use 200 as my base anyway on all my cameras....

No noise is no noise.... why not take advantage a little more sensitivity?
so I just want to get this right. ISO 200 has same image quality as ISO100?
12-23-2009, 01:34 PM   #13
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QuoteOriginally posted by joodiespost Quote
so I just want to get this right. ISO 200 has same image quality as ISO100?
It depends on what sensor (or sensors if comparing) you are dealing with. If ISO 200 is the native ISO of the sensor, and ISO 100 is achieved by the firmware then 200 will probably produce less noise than ISO 100. If, OTH, 100 is the native ISO for the sensor then it should be less noisy. It is unlikely, however, that you would be able to see the difference unless you are specifically looking for it, and looking very critically at that. If you are comparing two different sensors, then all bets are off as there are many other factors that affect noise.
12-23-2009, 01:43 PM   #14
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I have the K-x. The native ISO seems to be 200, but i've been shooting lately with 100. Do you recommend switch back to 200? Even in a sunny day outdoors?
12-23-2009, 01:56 PM   #15
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QuoteOriginally posted by joodiespost Quote
I have the K-x. The native ISO seems to be 200, but i've been shooting lately with 100. Do you recommend switch back to 200? Even in a sunny day outdoors?
This is an easy one. Put the camera on a tripod, shoot two shots each of several subjects, 1 at 100, 1 at 200 for each subject. Shoot some bright, well lit subjects, and some poorly lit as well and look at them very critically. Shoot with whichever looks best to you.If you can't decide, then use whichever setting suits your needs best for any particular situation. I am an extremely nit-picky obsessive/compulsive and I leave mine on Auto ISO with a range of 100-400 most of the time.
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