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05-15-2009, 07:51 AM   #1
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Tav mode

On the K20 D, what is Tav mode and when and where would you use this?

05-15-2009, 07:57 AM   #2
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Time to break out the manual friend.

Tv is for shutter priority - used to manually adjust your shutter speed, 1/250th, 1/500th, etc.

Av is for aperture priority - F8, F11, etc

Check out the book 'Understanding Shutter Speed'
05-15-2009, 09:17 AM   #3
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Welcome to PF, Amaruba. Reading the manual isn't a bad idea. However, the prior response didn't answer the question about TAv mode.

TAv is basically fixed shutter & fixed aperture with ISO changed automatically to obtain 'proper' exposure.

Possible use case--you're shooting sports or wildlife with a telephoto lens. You want to keep the shutter speed at 1/500 to freeze motion and reduce the effects of camera shake. You want to set aperture to f/8 for improved depth-of-field and lens performance. You let ISO vary between 100 and 800 (range configurable) to obtain proper exposure because the other two parameters (shutter & aperture) are more important to you.
05-16-2009, 01:43 AM   #4
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QuoteOriginally posted by AndrewG NY Quote
Possible use case--you're shooting sports or wildlife with a telephoto lens. You want to keep the shutter speed at 1/500 to freeze motion and reduce the effects of camera shake. You want to set aperture to f/8 for improved depth-of-field and lens performance. You let ISO vary between 100 and 800 (range configurable) to obtain proper exposure because the other two parameters (shutter & aperture) are more important to you.
Andrew, I photograph my son's weekly U7 soccer match. I've been using Av but I was a little unhappy with the results in these action shooting situations. After reading your post, I decided to give TAv mode a try. With a K20D & a DA 55-300/F4-5.8, I set the ISO range from 100-1600.

I used two settings during the game, taking 195 shots with this lens in TAv mode. It was a sunny day. Some of the action occurred in a shadowed part of the field.

Setting 1: 1/1000s, F8
Count: 136 shots

ISO 280: 90 shots
ISO 400: 32 shots
ISO 560: 10 shots
ISO 800: 1 shot
ISO 1100: 3 shots (sideline throw-ins with dark backgrounds - due to either the player's face being obscured or the shot being too static, none of these shots was uploaded)

Setting 2: 1/750s, F9.5
Count: 59 shots

ISO 280: 45 shots
ISO 400: 11 shots
ISO 560: 3 shots

Reviewing, I was happy with camera's ISO choices. It enabled me to keep the shutter speed & aperture constant. If it's a sunny day again, next time, I'll probably try a 1/750s & F11 combo (I'm looking for a bit more DOF in the 200-300mm FL range) & maybe a 1/1500s & F8 combo too.

You can see the result at Picasa Web Albums - Dan Bridges - 20090516 - Sa...

125 shots were uploaded. All shots at that link were shot in TAv mode, except for the 1st shot & the last 4 where I took close shots in Av mode with a DA 16-45/F4.

Dan.


Last edited by dosdan; 05-16-2009 at 02:07 AM.
05-16-2009, 05:29 AM   #5
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I had a bit of a problem but will uses your settings as a guide Dan


cheers
05-17-2009, 05:42 PM   #6
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I always use TAv for shooting sport. I know I want a min speed of 1/350 (faster if possible), and I know what aperture I want to use, f4 or faster. So I set the auto-ISO to range between 100 and 4500 (yep I have used that). I adjust the shutter and aperture on the go if light changes etc. and know that the cam will adjust to necessary ISO.
05-18-2009, 02:19 AM   #7
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Same here,shooting with the bigma it allows me to prioritise the shutter speed AND keep the beastie stopped down to reasonable F8 or so.Unless the light really is awfull i still get a reasonable ISO - the only weak link is me ah well....
05-19-2009, 08:58 PM   #8
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I use TAv almost consistently and exclusively .. it saves me alot of time from adjusting the iso or having to sadly bracket any given shot and even missing a shot.. so I love auto iso..

05-21-2009, 11:59 AM   #9
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QuoteOriginally posted by dosdan Quote
Andrew, I photograph my son's weekly U7 soccer match. I've been using Av but I was a little unhappy with the results in these action shooting situations. After reading your post, I decided to give TAv mode a try. With a K20D & a DA 55-300/F4-5.8, I set the ISO range from 100-1600.

I used two settings during the game, taking 195 shots with this lens in TAv mode. It was a sunny day. Some of the action occurred in a shadowed part of the field.

<snip>

Reviewing, I was happy with camera's ISO choices. It enabled me to keep the shutter speed & aperture constant. If it's a sunny day again, next time, I'll probably try a 1/750s & F11 combo (I'm looking for a bit more DOF in the 200-300mm FL range) & maybe a 1/1500s & F8 combo too.
Dan, glad that worked out for you. These different shooting modes can all produce "correct" exposures but just let you pick what to control and what the camera is allowed to automate. It really comes down to personal habits and shooting situations. It turns out that TAv can be pretty handy for sports. I personally think Pentax has a nice, clean, implementation that treats ISO like a first-class citizen (alongside aperture and shutter speed) rather than an afterthought like some other implementations.
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