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Forum: Troubleshooting and Beginner Help
07-22-2017, 06:00 PM
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For what it is worth, I have some extra information to chip in to this thread, concerning the EM-140.
Having searched the 'net high and low for information on compatibility of the Sigma EM-140 (and Pentax 160FC) ring flashes with my Pentax K-01 and Pentax K3ii, I recently had the chance to put things to the test (for the Sigma anyway, no chance to even get sight of a S/H 160FC on Ebay...). On Sigma's website - as of 23 July 2017 - the newest model stated to be compatible with the EM-140 is the K5... hardly 'new' nowadays.
Compatibility Table EM-140 DG Macro Flash | Sigma Corporation of America
After multiple tests in indoor and outdoor lighting conditions, using my DA35 Limited Macro, I can confirm that (i) the EM-140 is working well on my K3ii (generally slightly over-exposing by 0.5 or 1.0 stop using P-TTL, which can be easily compensated for on the flash), and (ii) the EM-140 has serious problems on my K-01. Specifically, even if the flash is turned off, when mounting it onto the K-01 hotshoe the camera thinks that the flash is charged (non-flashing 'flash symbol' appears on display). That's crazy, yes? When the camera is set to P and the flash to P-TTL, almost without exception I get fully discharged flash white-out. Then I also noticed that the shutter speed seems to intermittently go from something close to the flash sync speed (1/80 - 1/100s) to something pretty long (1/2s to 1s). It does this at a frequency of about once a second. All this suggests to me that the flash connections / programming on the K-01 is non-standard compared with other Pentax digitals. Who knows why.... but this might also give some insights for others who are trying to get their 160FC to work with the K-01. I am thinking that something went wrong with the K-01 somewhere in its making...
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