Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-29-2013, 09:27 PM   #1
Junior Member




Join Date: Apr 2013
Location: Raincity
Posts: 49
Is there a way to limit maximum shutter speed?

to shoot fixed aperture (let's say f8) and variable shutter speed from a certain value up ONLY (let's say 1/250 to max 1/6000) and auto ISO? I'm shooting a K-x.

Or at least auto ISO in M mode?

I like shooting Av, but find that shutter speed drops too often under 1/100. Don't want to shoot Tv because I don't want to lose control over DoF. P mode is just automatic everything, and I don't ALWAYS have the time to shoot M mode. I want to shoot M mode with some tweaks, is there such a thing?

The K-x is just to get used to Pentax for a while. I wouldn't mind finding out what other bodies have that kind of options. Or maybe the K-x has it and I'm too dumb to find it.

04-29-2013, 09:44 PM   #2
Veteran Member




Join Date: Feb 2011
Posts: 4,873
I don't think that's possible on any pentax. There are ways to tweak the program line in the menu, but I honestly don't touch that... I shoot TAv instead.

Any pentax with TAv mode (higher than base level) can do close to what you're asking for... set the shutter speed and aperture, with auto ISO.
04-29-2013, 09:52 PM   #3
Junior Member




Join Date: Apr 2013
Location: Raincity
Posts: 49
Original Poster
So Tav is what I'm looking for. Thanks.
04-29-2013, 09:54 PM   #4
Pentaxian
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,797
Unfortunately I believe the K-x was the last Pentax DSLR (and MILC) to not allow Auto ISO in M mode.
Other bodies have TAV mode which is the same thing, or else they let you use AUTO ISO in M mode.

04-29-2013, 10:26 PM   #5
Junior Member




Join Date: Apr 2013
Location: Raincity
Posts: 49
Original Poster
I've read about Tav, and although sounds pretty cool, it is not exactly what I was looking for.

Can I set shutter 1/250-1/6000, F8 only, and auto ISO? On any Pentax body?
04-29-2013, 10:45 PM   #6
Pentaxian
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,797
QuoteOriginally posted by steppenfuchs Quote
Can I set shutter 1/250-1/6000, F8 only, and auto ISO? On any Pentax body?
No the range in shutter speed is not possible. Using AV mode the shutter speed will go as low as conditions dictate.
In general it attempts to keep it above 1/focal length but if all other limits are reached shutter may drop more to achieve correct exposure.

In TAv you can select a specific shutter speed (depends on the application), F stop (for desired depth of field or lens sweet spot) and then let ISO float from base to a preset maximum.

Selection of a set shutter speed is usually desired - what is your application?
04-29-2013, 10:54 PM   #7
Junior Member




Join Date: Apr 2013
Location: Raincity
Posts: 49
Original Poster
Uhm there's not really an application, I'm just learning...and I'm pretty hectic in my shooting, most times I'm not even realizing that Av is giving me 1/60 shutter speed, and I end up with motion blur. Not that heavy, but can be clearly seen when zooming in. So I prefer higher shutter speeds.

I was randomly shooting in the park today, it was windy, whenever I was in the shadows Av was giving me speeds under 1/100, all my trees ended up blurry. Almost talking to the K-x, and saying stuff like "dude, please bump the ISO and give me decent shutter speeds".
04-29-2013, 10:56 PM   #8
Site Supporter
Site Supporter




Join Date: May 2012
Location: Adelaide
Photos: Gallery | Albums
Posts: 1,173
You can always bump up the ISO yourself in lower light situations.

04-29-2013, 10:58 PM   #9
Junior Member




Join Date: Apr 2013
Location: Raincity
Posts: 49
Original Poster
I'm obviously doing that. I think I'm just frustrated at not being able to shoot as fast as I want, that's all...
04-30-2013, 12:12 AM   #10
Veteran Member




Join Date: Oct 2011
Posts: 818
QuoteOriginally posted by crewl1 Quote
Unfortunately I believe the K-x was the last Pentax DSLR (and MILC) to not allow Auto ISO in M mode.
Other bodies have TAV mode which is the same thing, or else they let you use AUTO ISO in M mode.
I'm using a Kr and if i understand your statements here, Kr also does not allow Auto-ISO in M mode.
I believe Kr is the last one. Anything "higher" than K5 allows it: the wonderful TAv mode; user sets shutter speed (T) and apaerture (Av) while the body selects it's own ISO (Auto-ISO).

QuoteOriginally posted by crewl1 Quote
No the range in shutter speed is not possible. Using AV mode the shutter speed will go as low as conditions dictate.
In general it attempts to keep it above 1/focal length but if all other limits are reached shutter may drop more to achieve correct exposure.

In TAv you can select a specific shutter speed (depends on the application), F stop (for desired depth of field or lens sweet spot) and then let ISO float from base to a preset maximum.

Selection of a set shutter speed is usually desired - what is your application?
Hey, i think i might be wrong on this but i believe i read somewhere that the K5 allows a user to sort of "set" the minimum targeted shutter speed in Av mode?
Something in the setting that tells the camera the shutter speed "aimed" for like, Low(1/60), Medium(1/125), High(1/180)?
*once again, i might be wrong coz i thought i read it somewhere..*

If so, i'm not sure too whether this applies to the K5ii/s and K30..

EDIT: Regarding the Auto-ISO parameter, found the quote from erm... not sure whether it's safe to list the other forum but i'll just put the quote here:

  • Standard will get you a low shutter speed threshold of (around) 1/1.5*f before upping the ISO (i.e. a 30mm will have a low shutter speed of 1/50).
  • Slow will protect the ISO by one stop by allowing a full stop lower speed (in our example above, you'll get a 1/25 low limit)
  • Fast will be more ISO-aggressive by, again, one stop (so you'll end up with a 1/100 shutter speed in the above example).

Last edited by SyncGuy; 04-30-2013 at 12:15 AM. Reason: found the info!
04-30-2013, 12:28 AM   #11
Pentaxian
crewl1's Avatar

Join Date: Jul 2010
Location: Los Angeles, CA
Photos: Gallery | Albums
Posts: 9,797
QuoteOriginally posted by SyncGuy Quote
I'm using a Kr and if i understand your statements here, Kr also does not allow Auto-ISO in M mode. I believe Kr is the last one. Anything "higher" than K5 allows it: the wonderful TAv mode; user sets shutter speed (T) and apaerture (Av) while the body selects it's own ISO (Auto-ISO).
Oh bummer, I thought K-r allowed it, sorry.
04-30-2013, 12:47 AM   #12
Veteran Member
crossmr's Avatar

Join Date: Jul 2009
Location: Seoul, Korea
Photos: Gallery
Posts: 306
There really isn't, because, how would the camera know what you want?
Think about it.
If the shot is okay at F8 with:
1/250 and ISO400
if shutter and ISO are on auto...
how does the camera know if you want
1/250 and 400ISO
1/125 and 200ISO
1/500 and 800ISO
etc
You're a step away from full auto mode at that point (with some minor restrictions) and automode generally doesn't generate great results. You're letting the camera make decisions that it usually just gets totally wrong, by running the ISO really high (I had some friends who used a Nikon in automode and it was always choosing like 3200 ISO making grainy photos)
I just had to put my K30 in auto mode , because I haven't even once used it in that mode to see what happens. Even there, you have to either set the ISO or set a range. Then it tries to guess a "scene" type and apply some settings.

in manual on the K-X do you have to choose a specific ISO?
04-30-2013, 02:10 AM - 1 Like   #13
Site Supporter
Site Supporter
kiwi_jono's Avatar

Join Date: Dec 2009
Location: Christchurch, New Zealand
Photos: Gallery | Albums
Posts: 1,409
No a Pentax camera will not specifically do this. However the K-5 (but not K-x unfortunately - which I also own) does have some nice features that can help (particularly while in P mode):
1. Auto ISO parameter can set to bias ISO - Slow, Normal, Fast. If you set Fast then the camera increases ISO earlier meaning that you end up with a faster shutter. This can be quite useful for reducing the effect of shake (I find Normal is pretty good balance for most shooting).
2. Program Line parameter - Auto, Normal, Sport, Landscape, Portrait, MTF. This effects how the camera selects Aperture / Shutter and indirectly ISO. For example Sport selects a relatively fast shutter speed and Landscape sets smaller aperture (for more depth of field).
04-30-2013, 04:10 AM   #14
Moderator
Site Supporter
Loyal Site Supporter
Sandy Hancock's Avatar

Join Date: Feb 2012
Location: Adelaide Hills, South Australia
Photos: Gallery | Albums
Posts: 7,752
I suspect we all are occasionally guilty of getting carried away with shooting, and ignoring what the top LCD or viewfinder is telling us.
Just get better at it. Slow down a fraction. Review the first few shots you take when conditions change, and adjust accordingly.
Otherwise just shoot in green mode and accept quite a lot of your shots will be rubbish (not really recommending this....)
04-30-2013, 04:26 AM   #15
Site Supporter
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: North Syracuse, NY
Photos: Gallery
Posts: 14,216
QuoteOriginally posted by crewl1 Quote
Oh bummer, I thought K-r allowed it, sorry.
The K-01 was the first to allow a pseudo-TAV. The K-30, because it uses a modified K-01 firmware, actually has a bug in that it still allows Auto-ISO in M mode.
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!
auto, camera, iso, k-x, mode, photography, shutter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question Is there a way to find which photos I've commented on? timh Site Suggestions and Help 10 03-09-2016 03:23 PM
Is there any way to adapt a rear PK mount to filter threads? GibbyTheMole Pentax SLR Lens Discussion 9 05-18-2012 04:33 PM
Is there a way to clean up these filters? Alliecat Pentax Camera and Field Accessories 18 02-01-2012 08:17 PM
Question Is there a way to stop this? JeffJS Site Suggestions and Help 3 10-12-2011 02:23 AM
Is there a way to properly auto focus? normhead Troubleshooting and Beginner Help 3 05-07-2011 01:34 PM



All times are GMT -7. The time now is 02:07 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