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01-25-2011, 12:45 PM   #1
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AF540 PTTL with TAV on K5?

hi,


I am trying to figure out my AF540 setting. It doesnt seem to talk to my K5 in terms of the setting it should use.

I have the flash mounted on the hotshoe, TAV mode, set shutter to 1/125 and F4, and it suggested ISO 3200, with or without the flash being on. Needless to say, it overexposes.

Am i doing something wrong, or am i in the wrong setting to have the Flash tell the camera body that it is mounted, and is on?

Thanks

01-25-2011, 01:05 PM   #2
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Are you sure you have the flash pushed all the way on? My 540 is sometimes difficult to fully seat because the shoe is such a tight fit. Next, What Flash mode are you using? Is the flash showing P-TTL?

01-25-2011, 01:05 PM   #3
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QuoteOriginally posted by D4rknezz Quote
hi,


I am trying to figure out my AF540 setting. It doesnt seem to talk to my K5 in terms of the setting it should use.

I have the flash mounted on the hotshoe, TAV mode, set shutter to 1/125 and F4, and it suggested ISO 3200, with or without the flash being on. Needless to say, it overexposes.

Am i doing something wrong, or am i in the wrong setting to have the Flash tell the camera body that it is mounted, and is on?

Thanks
I've got puzzled about that with my K-20D too . When use flash with TAv mode, the camera always uses highest ISO in the auto ISO range .
01-25-2011, 03:39 PM   #4
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Yes, the flash should be mounted properly, i mean, its firing...so i suppose it should be seated right.

The flash is at P-TTL. Help?

The camera doesnt seem to acknowledge its existence at all.


Ps: I just went and did a full auto setting on the camera, and P-TTL. It works fine . So it looks like TAV is buggy. ?


Last edited by D4rknezz; 01-25-2011 at 04:02 PM. Reason: more info
01-25-2011, 04:47 PM   #5
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FIXED.

Downloaded the latest shadow update for firmware 1.02. (I was running 1.02 before as well).
Now every setting produces the same result.
01-25-2011, 05:57 PM   #6
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So, What changed that makes you say it's Fixed, and where did you download the firmware from?

What I'm seeing with the 540 and a DA*16-50 on the K5 is that with TAv, the ISO will as you said, go to whatever the max auto is and stay there. That is true whether I set the shutter speed or the aperture, and as you reported, whether the flash is on or not. It is firing at those parameters as well so P-TTL is not adjusting the output. If I put the camera in Av with the 540, I get acceptable exposure but I'm betting that is more because ISO is held Low and I'm setting an aperture other than wide open. If I set the camera to Tv the Aperture (at lower ISO) will go to f2.8 and stay there unless I boost the ISO. The result is over exposure.

This is true with both my AF540 and my Metz 58AF-1..

01-25-2011, 06:28 PM   #7
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I had a similar problem with the AF540 in TAv mode. One night it would overexpose by several stops (practically the whole frame was blown out), later if worked fine. I don't recall having any issues with TAv since, but honestly, I usually use flash in M mode and set shutter, aperature, and ISO.
01-25-2011, 06:49 PM   #8
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Hi,

So the firmware was recently updated for K5 :

https://www.pentaxforums.com/forums/pentax-k-5-forum/128370-k-5-firmware-1-02...announced.html


I downloaded it and updated mine, however a few days later apparently it was updated again, quietly.

https://www.pentaxforums.com/forums/pentax-k-5-forum/130011-second-edition-k-...re-1-02-a.html


So just now i redownloaded the firmware, and now i get similar exposure in TAV, AV, TV and auto setting with PTTL.

I hope that fixes it for good
Please try it and report what you found, because i am particularly interested in purchasing the Metz.....

01-25-2011, 11:22 PM   #9
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It must have fixed something. Even though the numbers don't change (ISO still pegs in TAv mode), the exposures are much more consistent, and correct across modes. I don't really care what changed truthfully, I'm just glad it works.

01-26-2011, 06:10 AM   #10
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Yeah, thats right. TAV still hits highhh ISO, so the camera still doesnt seem to realize there is a flash sitting on it.

However, the flash at least seems to realize it *is* sitting on a camera, and adjusts its power accordingly.

Sigh. This is fun. The process of finding bugs.
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