Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-29-2010, 11:02 AM   #1
Pentaxian




Join Date: Nov 2008
Location: Bangalore
Photos: Gallery
Posts: 2,450
ISO 100 on K-x/k-r

ISO 100 on K-x/k-r - is it worth using ? or it's just a gimmick?

Thanks
Yusuf

12-29-2010, 11:09 AM   #2
Loyal Site Supporter
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,273
iso 100 isn't a gimmick, i use it when there is appropriate light available. less noise, better performance. usually you'll only use it out of doors, or at close quarters with a flash
at this time of year i don't use it much as i don't see much sunlight
To be honest i often wish for an even lower ISO. On film I frequently shot Fuji Velvia Transparencies (still do actually) iso 50 and I exposed for iso 40

here is an example from my medium format of such an exposure



and Here is one done with My K10d at Iso 100 back in october (and under exposed 7/10 of a top)




12-29-2010, 11:11 AM   #3
Site Supporter
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 1,935
QuoteOriginally posted by yusuf Quote
ISO 100 on K-x/k-r - is it worth using ? or it's just a gimmick?

Thanks
Yusuf
According to DxOMark, the K-X has 12.52 vs 11.91 stops of dynamic range at ISO 100 vs ISO 200. Seems like its worth using to me.
12-29-2010, 11:16 AM   #4
Loyal Site Supporter
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,273
QuoteOriginally posted by enoeske Quote
According to DxOMark, the K-X has 12.52 vs 11.91 stops of dynamic range at ISO 100 vs ISO 200. Seems like its worth using to me.
and that also is a good reason though specs aren't my never ending reason for using something. The Dynamic range on Velvia is very limited and it is quite contrasty and therefore very difficult to expose correctly. yet for many people it is a favourite film

12-29-2010, 11:33 AM   #5
Veteran Member
KxBlaze's Avatar

Join Date: Feb 2010
Location: California
Photos: Gallery
Posts: 1,594
It is definitely not a gimmick but I would be curious to see a side by side of 100 and 200 to see if the difference is noticeable. Anyone think it's really that noticeable?
12-29-2010, 11:58 AM   #6
Loyal Site Supporter
Loyal Site Supporter
eddie1960's Avatar

Join Date: Aug 2010
Location: Toronto
Photos: Gallery | Albums
Posts: 12,273
QuoteOriginally posted by KxBlaze Quote
It is definitely not a gimmick but I would be curious to see a side by side of 100 and 200 to see if the difference is noticeable. Anyone think it's really that noticeable?
that depends, the rest of the exposure will change to offset the 1 stop increase so aspects will change.
from a noise standpoint i think the difference will be in extreme pixel peeping which some people seem to love doing, in a scene with challenging dynamic range (landscapes are a common example) wher e the extra stop of DR will reveal more detail when exposed properly, in large prints where the noise will become apparent usually through softening of the image a little (though given the technology it would have to be a large enough print that you would offset it by being further away, and finally in a major crop where it will show in smaller prints possibly and more easily than in the extreme pixel peeping.

Also in very bright conditions (ie the beach or bright sunny days at a ski area for instance) the slower iso will allow you to open up your lens more (better for DOF) and let you avoid stopping down so much you begin to lose contrast (this starts happening beyond f 8 -11 in all lenses)
12-29-2010, 02:19 PM   #7
Site Supporter
Site Supporter
kiwi_jono's Avatar

Join Date: Dec 2009
Location: Christchurch, New Zealand
Photos: Gallery | Albums
Posts: 1,092
Its makes a difference. I use ISO 100 when I can. When I first got my camera I did some tests on a tripod and can see the difference at 100% size - definately pixel peeping but I would not say extreme pixel peeping. The difference is mostly noticable in the shaddow or darker areas of the image where DR is pushed.
I still can't work out (heard all of the official reasons) as to why ISO100 is part of an extended range that has to be turned on. But at least its better than the Nikon H1, H2 etc - that makes no sense to me.
12-29-2010, 04:05 PM   #8
Site Supporter
Site Supporter
kiwi_jono's Avatar

Join Date: Dec 2009
Location: Christchurch, New Zealand
Photos: Gallery | Albums
Posts: 1,092
To illustrate, see attached 100% crops of a darker blue area (sky in this case). I think you can tell which is ISO 100...

Attached Images
View Picture EXIF
PENTAX K-x  Photo 
View Picture EXIF
PENTAX K-x  Photo 
12-29-2010, 07:59 PM   #9
Site Supporter
Site Supporter
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 14,939
QuoteQuote:
ISO 100 on K-x/k-r - is it worth using ? or it's just a gimmick?
Compared to what? I'd be inclined to think ISO 51200 is a "gimmick".
12-30-2010, 07:25 AM   #10
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,216
I'm blessed (if you can call it that) to be living in sunny Florida, where 9 times out of 10, I can shoot at 100 with apertures down to 8 and still safely handhold (especially with SR).

And 100 never leaves my camera, unless we're talking fast moving objects or serious overcast.






12-30-2010, 07:30 AM   #11
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,216
QuoteOriginally posted by kiwi_jono Quote
To illustrate, see attached 100% crops of a darker blue area (sky in this case). I think you can tell which is ISO 100...
Wow. I didn't realize it was THAT much better.
12-30-2010, 08:32 AM   #12
Veteran Member




Join Date: Mar 2009
Location: Perth Australia
Photos: Albums
Posts: 1,512
why do they make it 'expanded' iso ffs if its a real and better option... same as 80 on k-5.
12-30-2010, 08:41 AM   #13
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,216
QuoteOriginally posted by WerTicus Quote
why do they make it 'expanded' iso ffs if its a real and better option... same as 80 on k-5.
I have my own opinion on this:

Although quite advanced, the K-x is still considered a "starter" DLSR. So for new users using auto modes, that extra stop loss from 200 to 100 will result in some unacceptable shots if the user is using auto ISO and the camera decides to go to 100. (Regardless of the auto mode you're in.) It's this same thinking that kept manufacturers from selling, let's say, ASA 50 disposable film cameras. They knew that would get people into trouble if they weren't shooting on the beach in bright sun.

In other words, conditions have to be right for 100, and for users who don't give a crap about conditions and just want to get the damn shot, Pentax keeps 100 locked away until you're ready for it. Same thing on the HIGH end:

They keep you away from mega-high ISO and resulting noise unless you're ready for it and know what to expect.
12-30-2010, 09:29 AM   #14
Senior Member




Join Date: Mar 2010
Location: VA
Photos: Albums
Posts: 227
Don't you lose the ability to recover raw detail in the highlights at 100 ISO? Haven't experimented, just assumed that was why they locked off the extended region.
12-30-2010, 08:04 PM   #15
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,216
QuoteOriginally posted by kxr4trids Quote
Don't you lose the ability to recover raw detail in the highlights at 100 ISO? Haven't experimented, just assumed that was why they locked off the extended region.
I don't have a clue, so I'm not saying you're wrong.

I only know what works for my limited skills and very limited talent.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, iso, k-x/k-r, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K-5 - ISO 80 better than 100? andi Pentax K-5 1 11-09-2010 03:12 PM
Default ISO 200 vs ISO 100 joodiespost Troubleshooting and Beginner Help 6 01-09-2010 05:50 PM
K7 - No Iso 100? noVICE Pentax DSLR Discussion 6 09-15-2009 06:09 PM
K7 ISO 100 ?? how to kmanlaker Pentax DSLR Discussion 4 08-08-2009 09:18 AM
iso 100 or iso 200 kiwao Pentax DSLR Discussion 8 03-05-2009 01:02 PM



All times are GMT -7. The time now is 05:39 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top