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07-26-2015, 04:21 PM   #1
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Challenge with Manual Flash and X Sync

Hi there... I seem to be having a challenge operating my 645Z with my AF 160FC Ring Flash and my Cactus V6 Transceiver.


I have been trying to use my Pentax AF 160FC and my Cactus V6 Transceiver with my 645Z in Manual and X sync modes; and every exposure has been consistently underexposed. The 645Z X sync speed is 1/125. I have noticed that on the 645Zs rear LCD panel, when the 645Z is set to X or M there is a flashing -5 in RED, which I am unable to adjust. Is there anyone who experienced this? If yes, how was it corrected?


07-26-2015, 04:29 PM   #2
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Ignore the-5. Your exposure is based on a manual flash setting. The meter is telling you that it is under exposed based on what it knows. You being a smart strobist will be adding key, fill, and other lighting to build the perfect exposure. Have fun!
07-27-2015, 08:56 AM   #3
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Thanks!

Hi Matt,


After I submitted the post, I actually ignored the "-5" and tested each RF60 from the extremes: full, 1/2 and 1/4 power, etc. and it worked. During the coming days, I would be doing further tests with a view to establish appropriate settings. Thanks again.
07-27-2015, 02:07 PM   #4
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Varying flash power, Aperture and distance of flash from subject as well as sensitivity will all effect flash exposure results.

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