Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-06-2010, 03:21 AM   #1
New Member




Join Date: Apr 2010
Posts: 6
[langtitle=fr]Probléme flou Pentax KX[/langtitle]

Bonjour, j'ai un Pentax KX Blanc, et je commence a en avoir un peu marre de ses flous, je m'explique, moi je prend souvent des photos d'objets ou chose en mouvements (mes chiens, les vagues..) et je m'apercois qu'il n'arrive a prendre les photos sans flou !

Voyez cette photo: http://img196.imageshack.us/img196/8417/imgp1310l.jpg

Cela est normal ou il y'a un reglage a faire?
J'utilise l'objectif de base!

Merci par avance


04-06-2010, 03:44 AM   #2
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
The picture actually looks rather good. All you can do to reduce blur is to shoot with a faster shutter speed. Use 1/500 or 1/750 or 1/1000 seconds, or faster.

Adjustment: I am not sure with the Kx, but you should have a Menu option to set the Program Line. Set it to Shutter Priority, and shoot in P(rogram) mode. Then your camera will try to use the fastest possible speed.

Bon chance!
04-06-2010, 04:29 AM   #3
Junior Member
r3nx's Avatar

Join Date: Aug 2007
Location: Estonia
Posts: 46
This is perfectly normal. You used 1/200 and f11 for the shot@ISO 400. What happens is that the dogs are moving too fast for the 1/200 shutter speed. You should get 1/500 or more easilly with f5.6 (switch to Av for example and set aparture to lets say f5.6). If not, try ISO 800. 1/500 should be enough for dog action.
04-06-2010, 04:33 AM   #4
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
If I look at the grass in the foreground, it's out of focus. The ball and the dog in the background are in focus.

So it looks like you or the camera focused on the wrong subject. Are you using center focus or do you let the camera decide where to focus?

To get both dogs (apparently) in focus, you need a deep depth-of-field (DOF). To achieve this, you need to use a narrow aperture (higher number like f/11) and focus somewhere in between the two dogs.

However, narrow aperture requires slower shutter speeds and that is not something that you want with fast moving subjects. So you have to use a higher ISO as well.

The other way to look at it is to have the dog in the foreground in focus as it's the main subject. You can use catch-in-focus, a technique that allows to take the shot automatically when the subject is in focus. I don't have experience with it and I don't know if it's possible with the Kx.

04-06-2010, 04:36 AM   #5
Junior Member
r3nx's Avatar

Join Date: Aug 2007
Location: Estonia
Posts: 46
I'd say it's not the focusing... The ball seems to be in focus, the yellow dog is blurry. Hard to say with this small photo. Maybe send a bigger one so it's clear what went wrong
04-06-2010, 04:43 AM   #6
New Member




Join Date: Apr 2010
Posts: 6
Original Poster
Merci a tous pour vos reponses, par contre j'ai oublié de vous dire une chose, je suis un gros novice!

Donc les isos, ca j'arrive a les regler par contre cette histoire de f8,f11 kezako?

Merci d'avance!
04-06-2010, 04:45 AM   #7
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
I don't say there is no motion blur; but I think the biggest problem for OP is the black dog. And that is a focusing/dof issue in my opinion (with the grass in the foreground as a reference). If not, I need new glasses
04-06-2010, 04:54 AM   #8
New Member




Join Date: Apr 2010
Posts: 6
Original Poster
Je vient de toucher a cette histoire de 1/500 etc, soit mes photos sont claire, soit elle sont trop sombre maintenant, en revanche il n'y a pas de flou en mode TV, maintenant que j'ai plus le flou j'ai des soucis avec cette fameuse molette lol!


04-06-2010, 04:56 AM   #9
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
ISO is a rating that indicates how much light is required to get a proper exposure. The higher the ISO, the lower the amount of required light.

The amount of light that reaches the sensor is determined by two factors: shutterspeed and aperture. If you use a faster shutter speed (e.g. 1/250sec instead of 1/125s) you need to use a wider aperture (decrease the aperture number; e.g. f/5.6 instead of f/8) to get the same total amount of light. And vice versa.

Shutter speeds go with a factor 2 (1/30, 1/60, 1/125 etc) and apertures go with a factor 1.4 (square root of 2; so e.g. f/4, f/5.6, f/8 etc). In both cases it's called a stop and you need to adjust the one the same amount of stops as the other to keep the same exposure. Time for you to read up on exposure
04-06-2010, 05:06 AM   #10
New Member




Join Date: Apr 2010
Posts: 6
Original Poster
D'accord et c'est quoi alors la vitesse "normale"
04-06-2010, 06:24 AM   #11
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
There is no 'normal' shutter speed. Somebody shooting a subject in the dark might find 30 seconds quite normal and you shooting dogs might find 1/1000sec quite normal. And somebody shooting F1 motor sports might find 1/2000sec normal.
04-06-2010, 08:18 AM   #12
Forum Member
FattyMcJ's Avatar

Join Date: Feb 2010
Location: Littleton, CO
Posts: 84
I would recommend you purchase this book. It will explain ISO/Shutter Speed/Aperture and how they all work together to achieve the correct exposure.

Amazon.com: Understanding Exposure: How to Shoot Great Photographs with a Film or Digital Camera (Updated Edition) (9780817463007): Bryan Peterson: Books

Read it, try things with your camera, then read it again. It's a wonderful learning tool.
04-06-2010, 09:23 AM   #13
Veteran Member
Ken T's Avatar

Join Date: Mar 2008
Location: California, USA
Posts: 537
What I see in the image is the shutter speed was slow and the black dog jumped out of the focus plane .
04-07-2010, 10:26 PM   #14
Senior Member




Join Date: Mar 2010
Location: Gold Coast, Australia
Photos: Gallery
Posts: 167
i don't think my kx got that problem, everything works fine
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, flou, kx, ou, pentax, photography, photos
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Acquisto pentax negli Stati Uniti e garanzia Internazionale Mitch Photographic Technique 3 12-07-2010 03:16 AM
Gros problème Pentax k-x !! kmy83 Pentax DSLR Discussion 6 02-02-2010 01:52 PM
Gros problème Pentax k-x !! kmy83 Pentax DSLR Discussion 2 01-31-2010 12:02 PM
Pentax K110D shutter release button fault? bogner Pentax DSLR Discussion 0 12-23-2009 09:09 AM



All times are GMT -7. The time now is 01:46 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