Thanks Bob! That's the final nail in the coffin I guess. I dread the thought of sending it off, though. It will have to go to Germany for repair, where Pentax Europe has dismantled its own organisation and buy the service from a company that also serve other manufacturers. Rumors of extremely long response times are reverberating both in virtual and physical spheres. :-(
Jostein 2009/7/21 Bob Sullivan <[email protected]>: > Jostein, > > I just ran a series theu the K-7 and 77 Ltd at F8 with the 540 Flash. > My flash doesn't show any anomalies when zoomed to 48mm vs 16, 24, 34, or 58. > Exposure stays the same. I think you have a flash fault. > Regards, Bob S. > > On Sun, Jul 12, 2009 at 4:03 AM, AlunFoto<[email protected]> wrote: >> Could I bother you guys to take a look at this comparison: >> http://www.alunfoto.no/temp/flashAnomaly/flashtest.html >> >> All shots obtained at a working distance of 2 meters, and with >> constant ambient light. The 48mm series stands quite distinctly apart. >> >> Graydon and John (or others), if you still think this is rationally >> explainable by other factors than a faulty flash, please let me know. >> >> Jostein >> >> 2009/7/11 Graydon <[email protected]>: >>> On Fri, Jul 10, 2009 at 10:10:23PM +0200, AlunFoto scripsit: >>>> You describe how I would expect the flash to function. My observation >>>> was that at _one_ particular zoom setting, 48mm, the output is two >>>> stops brighter than any other zoom setting. This also includes 58mm >>>> which, as you say, should produce a more concentrated beam. If there >>>> was any logic to this the 58mm zoom setting should have been even >>>> worse than 48mm, but the histogram at 58mm is perfect... :-( >>> >>> If there's a step function in the output of the flash, though, and "over >>> 48" gets stepped down and _up to_ 48 does not get stepped down, it's >>> quite possible that 48 would result in blown highlights while 58 >>> wouldn't. >>> >>> Why this is happening goes back to the usual "evil algorithm vs hardware >>> fault" question. >>> >>> -- Graydon >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >>> >> >> >> >> -- >> http://www.alunfoto.no/galleri/ >> http://alunfoto.blogspot.com >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
