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04-16-2011, 08:05 AM   #1
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K5 with 16-50mm Auto-ISO problems??

When the K5 first came out i purchased the camera along with the 16-50mm lens and AF-540 flash. I took several test shots with the external flash indoors. When I set it to Auto-ISO the camera would always select such a High-ISO 1600, 3200, 6400, etc.. The pictures came out quite poor overexposed and looked pretty bad. I also tried it without the flash and the pictures were not as bad but still very bright. I then set the ISO to 100,200 and 400 with the AF-540 and the pictures still were overexposed. I am not sure if I ended up with a defective camera or flash. So I sent everything back and just stuck with my point and shoot. Well I am looking again on purchasing a SLR and all the reading I do I have ended up back here looking at Pentax cameras again. I don't know if I should give the K5 another chance. Does any of what I said make sense? What do you think the issue was when I tested out the K5? Should I try it again?

Thanks
C. Conrad

04-16-2011, 08:32 AM   #2
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Unfortunately, this is an known issue for the K5 especially with bounce flash. Take a look at the folllowing threads-

https://www.pentaxforums.com/forums/pentax-k-5-forum/136720-k-5-bounce-flash-...onse-metz.html

https://www.pentaxforums.com/forums/pentax-k-5-forum/125951-k-5-overexposure-bounce-flash.html
04-16-2011, 08:34 AM   #3
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First, by auto-iso, do you mean using the TAv mode? Is there any reason why you want to use TAv with flash? Better use manual with fix iso and pttl, then you can adjust EFC or EV for finer degree of control.
04-16-2011, 08:43 AM   #4
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What is TAv mode?

04-16-2011, 09:01 AM   #5
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QuoteOriginally posted by conradcjc Quote
What is TAv mode?
Sorry, I didn't read your post properly... my bad. TAv mode is shooting mode in Pentax equivalent to other brands so that you control the shutter and aperture while letting the iso float (camera chooses depending on the exposure). I don't think you need to worry about flash capability on the k-5 yet.
04-16-2011, 11:16 AM   #6
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I wouldn't let the known issues with flash and the K5 prevent you from buying a DSLR or the K5 again. There are work arounds for this issue and I don't know of anyone who doesn't have to make some allowances for their flash.

Just FYI, it seems as though the problem is with the camera. You can use the same flash on other pentax models and not experience the exact same issue. Personally I struggled with this issue because I really wanted a easy pttl system for wedding photography. In the end I got the 540 flash and I plan on using manual control so that I don't encounter this issue. The one thing that I can suggest is selecting the ISO (don't use auto ISO with flash) and adjust the 540 or the camera to a negative EV.
04-17-2011, 10:03 AM   #7
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Here are some samples of shot I took with the K5 and the 540 flash.

I turned Auto-ISO off and actually set the ISO. Still the pictures look very overexposed.


ISO-200


ISO-200


ISO-80
04-18-2011, 02:13 AM   #8
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Hi Conrad,
As Efkelly has said, this issue has been discussed in a number of threads, including one that I started. The best solutions is to reduce the flash exposure by 1 to 1.5 stops - I have found that gives fairly good results. That said, the results with high ISO are so good that I use my flash very infrequently.
Regards.
Naim

04-18-2011, 02:51 AM   #9
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Ihmettelen tštškin vikaa.
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