Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-26-2014, 09:38 AM   #1
dvelosky
Guest




TAv Issue

When I select the TAv mode on my K20D, rather than float, the ISO blinks at a set rate (200 or 400 based on the D-Range setting). Adjustment of the shutter speed and/or aperture has no effect. Am I missing some internal setting somewhere?

12-26-2014, 11:26 AM   #2
Forum Member
gtis's Avatar

Join Date: Mar 2011
Location: south yorkshire
Photos: Gallery
Posts: 82
Hi
You might have to set it to auto ISO
Neil
12-26-2014, 11:37 AM   #3
Site Supporter
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 1,925
QuoteOriginally posted by dvelosky Quote
When I select the TAv mode on my K20D, rather than float, the ISO blinks at a set rate (200 or 400 based on the D-Range setting). Adjustment of the shutter speed and/or aperture has no effect. Am I missing some internal setting somewhere?
In TAv mode, you control the Aperture and Shutter speed and the camera adjusts the ISO to get a "correct" exposure. When a setting blinks, like your ISO, it means that the "correct" exposure is not possible with the current settings. In your circumstance, the ISO wants to go lower to get a correct exposure, but it can't (due to D-Range stuff), so it blinks to tell you it can't get the "correct" exposure. The situation is too bright for ISO 200 or 400. This is usually due to setting the aperture wide open, for instance, using f/1.8 on the 50mm f/1.8 lens, or using a long shutter speed, like 1 second or longer. There just is too much light coming in with those chosen A and T settings.
12-26-2014, 12:08 PM   #4
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 3,316
TAv blinking at low ISO means that the ISO is as low as it can go (for the current dynamic range settings and other menu items) but there's still too much light. Try faster shutter speed, narrower aperture, or as a last resort neutral density filter.

When TAv blinks at high ISO, it means there's not enough light available and the image will be too dark. Slow the shutter or open the aperture.

12-26-2014, 12:13 PM   #5
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,888
The blinking while TAv mode indicates the auto-ISO range is not able to accommodate the shutter-speed value set in order to obtain proper exposure. It happens quite often when you use TAv mode in broad daylight while keeping shutter speed low (often below 1/200). In which case, use Av mode with auto-ISO instead.
12-26-2014, 08:50 PM   #6
Site Supporter
Site Supporter
jpzk's Avatar

Join Date: Jan 2009
Location: Québec
Photos: Gallery | Albums
Posts: 7,258
I have been using TAv for years and I have the ISO set up in "auto ISO" ... takes care of things.
Careful not to go crazy in substandard light conditions though ...
12-26-2014, 09:28 PM   #7
Site Supporter
Site Supporter
enoeske's Avatar

Join Date: Jul 2009
Location: Surprise, Az
Photos: Gallery
Posts: 1,925
QuoteOriginally posted by jpzk Quote
I have been using TAv for years and I have the ISO set up in "auto ISO" ... takes care of things.
Careful not to go crazy in substandard light conditions though ...
ISO is set to auto automatically when in TAv mode. Thats the purpose of that mode.
12-26-2014, 09:49 PM   #8
mee
Pentaxian




Join Date: May 2010
Photos: Albums
Posts: 5,922
QuoteOriginally posted by enoeske Quote
ISO is set to auto automatically when in TAv mode. Thats the purpose of that mode.
On my K-5 II, the Auto ISO range is limitable. For instance, I have mine set to a range of 80-800

It will blink if it needs more than 800 but not go beyond my prescribed limits.

12-27-2014, 09:11 AM   #9
Site Supporter
Site Supporter
jpzk's Avatar

Join Date: Jan 2009
Location: Québec
Photos: Gallery | Albums
Posts: 7,258
QuoteOriginally posted by enoeske Quote
ISO is set to auto automatically when in TAv mode. Thats the purpose of that mode.
Well, I meant that but goofed when I said "I set to auto ISO ..." right you are: it is the way it works.
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, pentax help, tav
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Odd TAV behavior Mikesul Troubleshooting and Beginner Help 15 11-25-2014 01:27 PM
EV +- in TAv mode? Moropo Troubleshooting and Beginner Help 12 11-15-2014 05:49 PM
K-30 tav iso Takumar55 Pentax K-30 & K-50 6 01-14-2014 05:41 PM
Av TAv Question Bigdomino Troubleshooting and Beginner Help 4 01-12-2014 07:50 PM
TAv with flash Ken T Pentax K-30 & K-50 10 03-14-2013 06:20 AM



All times are GMT -7. The time now is 01:07 AM. | 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