You're right, the series at 48mm is anomalous, yet consistent as if by
design. But the shot at 58mm f4 is amazing the lens produces text! Now
that's something.
AlunFoto 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.
--
The free man owns himself. He can damage himself with either eating or
drinking; he can ruin himself with gambling. If he does he is certainly a damn
fool, and he might possibly be a damned soul; but if he may not, he is not a
free man any more than a dog.
--G. K. Chesterton
--
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.
