Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-15-2011, 08:58 AM   #1
Veteran Member
cbope's Avatar

Join Date: Dec 2011
Location: Helsinki
Posts: 664
1/3 vs 1/2 EV stops

After reading the camera walkthrough in the K-5 review here on Pentaxforums, I noticed it said to set the EV steps custom function to 1/2 stops vs the default of 1/3 stops. Now before someone starts to explain stops, don't bother, I know well what f stops are. My question is, why would you switch it to 1/2, when the default will give you more precision? Is it that the sensor DR in the K-5 has more than enough exposure latitude to easily cover a larger stop interval? What is the reasoning behind setting 1/2 stops?

12-15-2011, 09:05 AM   #2
Pentaxian
RonHendriks1966's Avatar

Join Date: Jan 2009
Photos: Gallery
Posts: 8,556
No idea, but I know that the difference between them is very small. From 1/3th to 1/2 to 2/3th are small steps.
12-15-2011, 09:10 AM   #3
Veteran Member
Don From The Radio's Avatar

Join Date: Jul 2011
Location: Delaware
Photos: Gallery | Albums
Posts: 344
I'd guess it's just a matter of personal preference. In my case, when I used 1/3 stop setting, the numbers look weird and it's tougher to calculate exposures. I'm used to 1/2 stop, so thats what I use. I'm sure some people have the opposite story.
12-15-2011, 09:15 AM   #4
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
QuoteOriginally posted by cbope Quote
What is the reasoning behind setting 1/2 stops?
Same feature on my K20D. Why 1/2-stop steps? Larger intervals give greater range. With 1/3-stop steps we can adjust plus/minus 2EV; with 1/2-stop intervals, we can go 3EV. So we can choose between precision and range. And it's a matter of tradition for those of us used to 1/2-stop calculations.

12-15-2011, 09:29 AM - 1 Like   #5
Senior Member




Join Date: Jan 2011
Location: Paradise, NL
Photos: Albums
Posts: 106
For most I use 1/3 stops. However, when I use my Cactus V5 triggers I have to switch to 1/2 stops in order to get the 1/180 shutter speed. My K-r doesn't pick up the Cactus as a flash and therefore when on 1/3 stops the shutter speed goes from 1/160 to 1/200. Sync speed is 1/180 (which is a 1/2 stop).

Last edited by ablundon; 12-15-2011 at 05:43 PM.
12-15-2011, 12:14 PM   #6
Veteran Member
cbope's Avatar

Join Date: Dec 2011
Location: Helsinki
Posts: 664
Original Poster
QuoteOriginally posted by ablundon Quote
For most I use 1/3 stops. However, when I use my Cactus V5 triggers I have to switch to 1/2 stops in order to get the 1/180 shutter speed. My K-r doesn't pick up the Cactus as a flash and therefore when on 1/3 stops the shutter speed goes from 1/160 to 1/200. Sync speed is 1/180 (which is a 1/3 stop).
Yes, I noticed that when I was experimenting with my AF360FGZ flash. Top sync speed of 1/180 will not be available in non-program modes if you have the camera set to 1/3 stops.
12-15-2011, 02:37 PM   #7
Veteran Member
Docrwm's Avatar

Join Date: Sep 2010
Location: Somewhere in the Southern US
Photos: Gallery | Albums
Posts: 11,275
QuoteOriginally posted by ablundon Quote
For most I use 1/3 stops. However, when I use my Cactus V5 triggers I have to switch to 1/2 stops in order to get the 1/180 shutter speed. My K-r doesn't pick up the Cactus as a flash and therefore when on 1/3 stops the shutter speed goes from 1/160 to 1/200. Sync speed is 1/180 (which is a 1/3 stop).
Thanks for that!
12-15-2011, 02:57 PM   #8
Pentaxian
audiobomber's Avatar

Join Date: May 2008
Location: Sudbury, Ontario
Photos: Albums
Posts: 6,631
I was using 1/3 stops until I bought a couple of manual lenses, which use 1/2 stops on the aperture ring. Now I only use 1/2 stops, so I don't have to keep working with two systems. Now that I'm used to 1/2 stops, I wouldn't go back. With digital, it's too easy to tweak sensitivity during post-processing. There's no need for fractional precision in the field. Just keep that histogram between the lines, fine tune at home where required.


Last edited by audiobomber; 12-15-2011 at 03:40 PM.
12-15-2011, 03:15 PM   #9
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
QuoteOriginally posted by ablundon Quote
For most I use 1/3 stops. However, when I use my Cactus V5 triggers I have to switch to 1/2 stops in order to get the 1/180 shutter speed. My K-r doesn't pick up the Cactus as a flash and therefore when on 1/3 stops the shutter speed goes from 1/160 to 1/200. Sync speed is 1/180 (which is a 1/3 stop).
Just turn the mode to X and you get 1/180 as well not matter what settings you use.
12-15-2011, 03:37 PM   #10
Veteran Member
Eruditass's Avatar

Join Date: Jul 2009
Location: Pittsburgh, PA
Photos: Gallery | Albums
Posts: 2,206
The K-r has X mode? My K-x sure as hell doesn't.

I think the solution is to change the Sync speed to 1/500
12-15-2011, 03:41 PM   #11
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
I don't believe so but all the advance cameras have it though.
And what is the difference between 1/160 and 1/180 anyway, you can't see that.

Replacing the mechanical shutter with an LCD shutter might do the trick as well but you will lose some light.
Last time i looked it was around 20% so maybe they have improve them with all the 3D going on at the moment.
12-15-2011, 03:42 PM   #12
Pentaxian
RonHendriks1966's Avatar

Join Date: Jan 2009
Photos: Gallery
Posts: 8,556
QuoteOriginally posted by Eruditass Quote
The K-r has X mode? My K-x sure as hell doesn't.

I think the solution is to change the Sync speed to 1/500
K-r doesn't either, but AnvH likes to type things without ever checking.
12-15-2011, 03:43 PM   #13
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
QuoteOriginally posted by RonHendriks1966 Quote
K-r doesn't either, but AnvH likes to type things without ever checking.
I never said the Kr had one and i believe the topic was about the K5

QuoteOriginally posted by cbope Quote
After reading the camera walkthrough in the K-5 review here on Pentaxforums, I noticed it said to set the EV steps custom function to 1/2 stops vs the default of 1/3 stops. Now before someone starts to explain stops, don't bother, I know well what f stops are. My question is, why would you switch it to 1/2, when the default will give you more precision? Is it that the sensor DR in the K-5 has more than enough exposure latitude to easily cover a larger stop interval? What is the reasoning behind setting 1/2 stops?
12-15-2011, 03:48 PM   #14
Pentaxian
RonHendriks1966's Avatar

Join Date: Jan 2009
Photos: Gallery
Posts: 8,556
QuoteOriginally posted by ablundon Quote
For most I use 1/3 stops. However, when I use my Cactus V5 triggers I have to switch to 1/2 stops in order to get the 1/180 shutter speed. My K-r doesn't pick up the Cactus as a flash and therefore when on 1/3 stops the shutter speed goes from 1/160 to 1/200. Sync speed is 1/180 (which is a 1/3 stop).
QuoteOriginally posted by Anvh Quote
Just turn the mode to X and you get 1/180 as well not matter what settings you use.
Bite me
12-15-2011, 03:49 PM   #15
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
QuoteOriginally posted by RonHendriks1966 Quote
Bite me
Not my fault he start to talk about the Kr
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, default, dslr, ev, k-5, k-5 ii, k-5 iis, k5, pentax k-5, vs
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Manual lenses and F stops jjhenders Troubleshooting and Beginner Help 4 11-29-2011 07:13 PM
Newbie question about f-stops joshfishkins Troubleshooting and Beginner Help 6 07-03-2011 08:08 PM
Sigma 17-70 f2.8-4.5 (FL and f-stops) fLyIr Pentax SLR Lens Discussion 6 03-09-2011 09:42 AM
Between aperture stops on 'A' lens tmadam Pentax SLR Lens Discussion 2 03-04-2010 05:15 PM
Uploaded images seem to lose 1-2 stops Nomad Troubleshooting and Beginner Help 6 02-05-2010 03:54 PM



All times are GMT -7. The time now is 09:06 PM. | See also: NikonForums.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