All Forum Comments
Comment by misiek_knm posted on One of the Langdale Pikes from Bowfell C&C please at 05/10/2009 - 23:16
Comment by misiek_knm posted on First pictures with the 16-45 at 05/10/2009 - 23:11
Also the way the buildings edges bend - effect mentioned by Kris above - looks unusual.
But, as I said, generally I like it Try something worse
Comment by misiek_knm posted on Experiment for C&C at 05/10/2009 - 23:07
Comment by misiek_knm posted on Anyone for golf? at 03/10/2009 - 21:00
Comment by misiek_knm posted on PPG loves me again. at 03/10/2009 - 11:06
Comment by misiek_knm posted on In Whitechapel today... at 02/10/2009 - 23:45
Comment by misiek_knm posted on Rosehips at 02/10/2009 - 23:42
C&C welcome
DA 16-45 @16mm; 1/400s; f/6.3; ISO 100; EV -1.3
[IMG]http://i384.photobucket.com/albums/oo284/misiek_knm/PU/imgp2726.jpg[/IMG]
Comment by misiek_knm posted on Nissan Patrol at 02/10/2009 - 23:34
Being able to do trailing curtain sync is a function of the flash unit itself, not the camera The interaction with a basic flash unit works like this:
* Leading curtain falls
* Flash contacts are shorted
* Timer
* Flash contacts are released
* Trailing curtain falls
Normally the flashgun will fire when the contacts are shorted - leading curtain sync.
With appropriate electronics in the flashgun itself it can be set to fire the light when the flash contacts are released (having been shorted first).
Does that makes sense? (Sorry if it's waffly )
Matt
I can imagine how curtains work - I have seen that in my Zenit long time ago (once I wanted to see what's happening when I press the shutter, so I opened the back (no film, obviously) and tried with slow shutter speed (1/30s, B), quite interesting). I believe it is similar then.
But I thought it is camera which triggers the flash in the proper time - ha! I was wrong. So this means that AF240Z has no trailing curtain capability - it fires instantly. It still allows leading curtain sync which is enough for some experiments I plan
Excellent explanation, you should add it to your guide v.2 - thanks again!
Comment by misiek_knm posted on Pentax AF240Z on K20D at 02/10/2009 - 23:17
The reason why the flash "knows" about the diffuser in A mode, is that the sensor on the flash is registering the amount of light which hits it (and which will also hit the sensor or film in the camera).
Clearly, a diffuser will reduce the amount of light coming back to the flash sensor, so it will compensate accordingly.
G
(Matt)
As George points out, the light sensor in the body of the flash unit measures the reflected light to judge how much light to release. If you put a diffuser, or bounce the flash, the "eye" of the flash still points towards the subject.
... cut ...
Matt
(George)
I pointed you in that direction because he explains the principles.
G
Comment by misiek_knm posted on Pentax AF240Z on K20D at 02/10/2009 - 23:06

