Question about Pentax K20D Digital Camera

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My Pentax 20d consisitently underexposes when shooting RAW in any mode e.g. aperture priority

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Make sure that you have not set it to a underexposure in the settings. Pentax cameras can be set to over or under expose any picture by up to 5.0 EV steps

Posted on Feb 28, 2011

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How does aperture setting affect a photograph?


The aperture is the opening in the lens through which light passes to the image sensor. Changing the aperture setting allows you to control the depth of field of a photograph. When the aperture is opened to a widersetting, (indicated by a lower f-stop number) more light is passed to the imagesensor, creating more shallow depth of field. Closing the aperture (indicatedby a higher f-stop number) allows less light to pass to the image sensor,creating wider depth of field.

NOTE: The aperture setting is one of three primary settings usedto control the overall exposure of a photograph. The other two primary settingsare ISO and shutter speed. Because the three settings work together to produce the overall exposure for a photograph, changingthe aperture setting will require complimentary changes to either the ISO or shutter speed to produce a properly exposed photograph. These changes will bemade automatically by the camera in the Auto, Program, Aperture-priority andShutter-priority modes.

There are two ways tocontrol the aperture setting on the camera:
  • Aperture-priority mode (A) - When shooting in Aperture priority mode (A), you set the aperture value and the camera automatically sets the optimum shutter speed for you.
  • Manual mode (M) - When shooting in Manual mode (M), you control both aperture and shutter speed, which gives you maximum creative control to achieve the exact results you want.

on Jan 08, 2011 | Cameras

1 Answer

Why does my brand new Canon 6D freeze when shooting in RAW


The question in the title and the first sentence imply to me that you have confused manual mode and RAW format.

Title: "Why does my brand new Canon 6D freeze when shooting in RAWD freeze when shooting in RAW"

First sentence: "My brand new Canon 6D freezes when I try to shoot in manual."

Manual mode means you are responsible for all of the settings related to exposure (aperture, ISO, and shutterspeed). RAW is a specific file format to save the photo. They are independent of each other.

My guess is that in manual mode you have the shutterspeed set to the maximum of 30 seconds. The camera isn't going to automatically adjust it for you in manual mode. If you're new to DSLRs, start with Ae (Aperture priority) or Tv (Shutter priority). In Ae mode, you control the aperture and the camera will select the shutterspeed. In Tv mode, you select the shutterspeed and the camera selects the aperture for you. Start off with Auto ISO. This will help you learn what combinations of settings work well together.

Jun 25, 2013 | Canon EOS 6D DSLR Camera Body Only

1 Answer

Can use the camera comes up with the message saying "green mode must be canceled to use this function" (menu)


You haven't stated which model you have, but on Pentax models "green mode" is an auto-everything mode. You just point the camera, adjust the zoom and the camera chooses everything else. As a result it does not allow access to almost all other functions.

Not all functions are available in all modes: you'll find similar restrictions when using any of the scene modes which your camera is likely to have, but for most of them you'll have fewer restrictions. You get maximum control in manual mode, and a very slightly less in aperture priority mode (the choose the aperture, the camera selects the correct matching shutter speed) and also in shutter priority mode (you choose the shutter speed, the camera selects the correct aperture). Program mode chooses the aperture and shutter speed for you, but allows you to retain full control of everything else and also to adjust the balance between the pre-selected shutter and aperture settings whilst maintaining the same exposure level. These modes are labelled P,A, S, M on those camera function dials which support these modes, your may or may not have them.

I hope that my speedy free reply has been of assistance to you; if so please let me know by taking a moment to rate my answer. If not, please add a comment instead and state your exact camera model and I shall be happy to assist you further.

Oct 08, 2010 | Pentax Cameras

1 Answer

Using a 500mm fixed aperture lens on a Pentax ist


Use "exposure compensation" (the button with a plus/minus symbol). It allows you to lighten (toward the + side) or darken (toward the - side).

Nov 15, 2009 | Pentax *ist DL Digital Camera

1 Answer

Grainy, Spot Filled Images when using Manual Modes Only


It sounds like the aperture is getting set very high. If the aperture is a high number, the lens opening is very small which lets less light in and would cause a dark image. This would also show any dust that is in or on the lens or image sensor. The dust doesn't usually show on apertures with a larger opening (smaller number). Make sure your aperture is being set to a reasonable number, probably no higher than 8 or so.

Oct 29, 2008 | Canon EOS-20D Body only Digital Camera

1 Answer

RAW setting


Your camera must be on either Aperture priority (AV), Shutter priority (TV), or in Manual mode to change to this setting. I discovered the same thing. One thing you might to to is have it set to RAW + JPEG. You get two pictures in one shot and can quickly upload one to sites when you need it.

Jul 14, 2008 | Canon PowerShot G9 Digital Camera

1 Answer

Exposure problem


If you set your meter based on the white (or substantially white) wall, as per the attachment, I would expect the image to be underexposed.

Sep 14, 2005 | Canon EOS-1D Mark II Digital Camera

2 Answers

Program mode


MTF stands for "Modulation Transfer Function" ... It's a somewhat arcane name for one type of testing methodology used in modern lens analysis. The *ist D's MTF priority program mode sets the "best" aperture to use for a given ISO setting and meter reading based upon lens information encoded in the latest FA series lenses. Earlier series lenses do not include MTF information in their communication with the camera so I suspect it defaults to Normal program mode when non-FA lenses are used.

Sep 08, 2005 | Pentax *ist D Digital Camera

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