*ist D Metering Issue
I've put up four recent shots taken with the *ist D to demonstrate what I had earlier mentioned regarding a perceived metering anomaly. The first three are badly overexposed. Exposure data is listed with the photo. All were taken within a 60 second time span. All were taken with multi-seg metering and Shutter Speed Priority AE mode. Image one was shot at the exposure values the camera calculated for a 1 sec exposure with no EV compensation. Realizing image 1 was overexposed, I adjusted EV -1.0 for image 2, and EV -2.0 for image 3. Not understanding the results I shot image 4 at much different settings with no EV compensation and the image is properly exposed. Two basic issues: 1. Why the gross overexposure at slow shutter speeds? 2. Why was there not a visible difference between images 1,2,3 (especially 1 and 2) when using EV compensation? http://www.photo.net/photodb/presentation.tcl?presentation_id=253048 Tom C.
SV: *ist D Metering Issue
To me it looks like the first three was out of the range of posible aperures. Jens Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -Oprindelig meddelelse- Fra: Tom C [mailto:[EMAIL PROTECTED] Sendt: 7. juli 2004 00:45 Til: [EMAIL PROTECTED] Emne: *ist D Metering Issue I've put up four recent shots taken with the *ist D to demonstrate what I had earlier mentioned regarding a perceived metering anomaly. The first three are badly overexposed. Exposure data is listed with the photo. All were taken within a 60 second time span. All were taken with multi-seg metering and Shutter Speed Priority AE mode. Image one was shot at the exposure values the camera calculated for a 1 sec exposure with no EV compensation. Realizing image 1 was overexposed, I adjusted EV -1.0 for image 2, and EV -2.0 for image 3. Not understanding the results I shot image 4 at much different settings with no EV compensation and the image is properly exposed. Two basic issues: 1. Why the gross overexposure at slow shutter speeds? 2. Why was there not a visible difference between images 1,2,3 (especially 1 and 2) when using EV compensation? http://www.photo.net/photodb/presentation.tcl?presentation_id=253048 Tom C.
Re: *ist D Metering Issue
On 6 Jul 2004 at 16:45, Tom C wrote: > I've put up four recent shots taken with the *ist D to demonstrate what I > had earlier mentioned regarding a perceived metering anomaly. > > The first three are badly overexposed. Exposure data is listed with the > photo. All were taken within a 60 second time span. All were taken with > multi-seg metering and Shutter Speed Priority AE mode. Image one was shot at > the exposure values the camera calculated for a 1 sec exposure with no EV > compensation. Realizing image 1 was overexposed, I adjusted EV -1.0 for image > 2, and EV -2.0 for image 3. Not understanding the results I shot image 4 at > much different settings with no EV compensation and the image is properly > exposed. > > Two basic issues: > > 1. Why the gross overexposure at slow shutter speeds? Your results have much to do with the metering range of the camera I suspect? Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
Re: *ist D Metering Issue
I thought that in Hyper Program mode that the camera would only allow shutter/aperture values that resulted in a 'proper' exposure. It looks like there may be a little double talk in the manual. It says regarding Hyper P, "You can also use the TV dial and the AV dial to change the shutter speed and aperture while keeping the proper exposure". But later it says "You can set a custom function to compensate the sensitivity automatically to obtain the proper exposure when the conditions set are not obtaining the proper exposure". So it looks like the manual starts out describing Hyper P with a blanket statement that may only be true if a custom function is set". I can't remember if the exposure warning was blinking or not... presumably so... It looks like the default value for the custom function may be reverse of the default for the PZ-1p...? Tom C. From: "Rob Studdert" <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: *ist D Metering Issue Date: Wed, 07 Jul 2004 09:12:05 +1000 On 6 Jul 2004 at 16:45, Tom C wrote: > I've put up four recent shots taken with the *ist D to demonstrate what I > had earlier mentioned regarding a perceived metering anomaly. > > The first three are badly overexposed. Exposure data is listed with the > photo. All were taken within a 60 second time span. All were taken with > multi-seg metering and Shutter Speed Priority AE mode. Image one was shot at > the exposure values the camera calculated for a 1 sec exposure with no EV > compensation. Realizing image 1 was overexposed, I adjusted EV -1.0 for image > 2, and EV -2.0 for image 3. Not understanding the results I shot image 4 at > much different settings with no EV compensation and the image is properly > exposed. > > Two basic issues: > > 1. Why the gross overexposure at slow shutter speeds? Your results have much to do with the metering range of the camera I suspect? Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
Re: *ist D Metering Issue
> > Two basic issues: > > 1. Why the gross overexposure at slow shutter speeds? Because you were shooting in shutter priority, and set the shutter speed to a value (1 second) that would require the lens to stop down to a very small aperture (something like f88) in order to achieve proper exposure. The lens was incapable of doing that, so it stopped down to its minimum aperture of f22. > 2. Why was there not a visible difference between images 1,2,3 (especially > 1 and 2) when using EV compensation? Because there was no difference. In the first shot, the lens stopped down to f22 instead of the f88 that would have resulted in the proper exposure. When you set exposure compensation to -1, the lens would have had to stop down even further, to f128, to get correct exposure. It could not do this, and just stopped down the the f22 it could do. > http://www.photo.net/photodb/presentation.tcl?presentation_id=253048 > > Tom C. > >
Re: *ist D Metering Issue
Yeah, that's one of the drawbacks of using some of the fancier automated functions. I have tended to lose my intuition and let the camera "think" for me. Tom C. From: "John Francis" <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: *ist D Metering Issue Date: Tue, 6 Jul 2004 19:52:14 -0400 (EDT) > > Two basic issues: > > 1. Why the gross overexposure at slow shutter speeds? Because you were shooting in shutter priority, and set the shutter speed to a value (1 second) that would require the lens to stop down to a very small aperture (something like f88) in order to achieve proper exposure. The lens was incapable of doing that, so it stopped down to its minimum aperture of f22. > 2. Why was there not a visible difference between images 1,2,3 (especially > 1 and 2) when using EV compensation? Because there was no difference. In the first shot, the lens stopped down to f22 instead of the f88 that would have resulted in the proper exposure. When you set exposure compensation to -1, the lens would have had to stop down even further, to f128, to get correct exposure. It could not do this, and just stopped down the the f22 it could do. > http://www.photo.net/photodb/presentation.tcl?presentation_id=253048 > > Tom C. > >
Re: *ist D Metering Issue
On Tue, 6 Jul 2004, Tom C wrote: > I thought that in Hyper Program mode that the camera would only allow > shutter/aperture values that resulted in a 'proper' exposure. In the first email you said: > > > All were taken within a 60 second time span. All were taken > > > with multi-seg metering and Shutter Speed Priority AE mode. That is not HyperProgram, that is Shutter Priority (Tv). In Tv or Av mode the camera will allow you to hang yourself. In Tv it will use the shutter speed that you told it, and only adjust the aperture. If the lens can't be stopped down enough then you'll get this over exposure. alex
Re: *ist D Metering Issue
- Original Message - From: "Tom C" Subject: Re: *ist D Metering Issue > Hi ALex, > > But that's now what page 60 of the manual says... > > However it's what 61 says... > > I fail to understand why Pentax even has a dedicated > shutter-priority/aperture-priority setting on the mode dial when it can be > chosen when in Hyper P mode. I'd never thought of it in these terms before, > but that seems like a colossal waste of real estate in designing the > interface. All three are "features". You put out a full meal deal camera with missing features, no matter how redundant, and DPReview will lambaste you. I had never used Hyper P mode before this camera. I fell into it quite easily though. Really though, it's not a replacement for Av or Tv controls. Sometimes you just want to lock in a partiular shutter or aperture and let the camera do it's work. William Robb
Re: *ist D Metering Issue
It does tell you that you're out of range. The chosen ap or shutter speed blinks when out of range in Av or Tv mode. But it's easy to ignore the blinking in the heat of battle. Paul On Jul 7, 2004, at 9:15 AM, Kostas Kavoussanakis wrote: On Tue, 6 Jul 2004, alex wetmore wrote: I cannot believe that it will not tell you on the viewfinder though. It does so on the -50 and the -5n. Kostas
RE: SV: *ist D Metering Issue
I agree... but I thought, maybe falsely, that when in Program AE modes, the shutter would not trip if an improper exposure combination was chosen. Tom C. From: "Jens Bladt" <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] To: <[EMAIL PROTECTED]> Subject: SV: *ist D Metering Issue Date: Wed, 7 Jul 2004 00:55:40 +0200 To me it looks like the first three was out of the range of posible aperures. Jens Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -Oprindelig meddelelse- Fra: Tom C [mailto:[EMAIL PROTECTED] Sendt: 7. juli 2004 00:45 Til: [EMAIL PROTECTED] Emne: *ist D Metering Issue I've put up four recent shots taken with the *ist D to demonstrate what I had earlier mentioned regarding a perceived metering anomaly. The first three are badly overexposed. Exposure data is listed with the photo. All were taken within a 60 second time span. All were taken with multi-seg metering and Shutter Speed Priority AE mode. Image one was shot at the exposure values the camera calculated for a 1 sec exposure with no EV compensation. Realizing image 1 was overexposed, I adjusted EV -1.0 for image 2, and EV -2.0 for image 3. Not understanding the results I shot image 4 at much different settings with no EV compensation and the image is properly exposed. Two basic issues: 1. Why the gross overexposure at slow shutter speeds? 2. Why was there not a visible difference between images 1,2,3 (especially 1 and 2) when using EV compensation? http://www.photo.net/photodb/presentation.tcl?presentation_id=253048 Tom C.
