All Forum Comments
Comment by misiek_knm posted on Tablet, do you use one? at 01/10/2009 - 21:52
According to the AF240Z manual, the "P" mode should set the appropriate aperture on the camera (assuming the camera is in P or Green). This may not work on the dSLRs. It's quite a nice feature (for the bodies that work with it) as it eliminates some of the error.
The "A" mode on the flash will require you to manually set the aperture on the camera. Use "Av" or "M" mode on the camera (preferably M).
The "M" mode on the flash will, as you say, discharge a set amount of light. However, the advantage with digital is you can easily do a trial-and-error to get it right.
In all cases, make sure you FIX the ISO setting on the camera! These older flashes were built before auto-ISO existed (Using the "M" mode on the camera fixes the ISO too)
I'd suggest using fully manual on the camera. Set 1/180s on the body, f/8, ISO400 and work from there. You'll probably find the "A" setting on the flash the best for ad-hoc shots.
(You may also find my flash guide a useful addition.)
HTH!
Matt
However, you mentioned there Trailing Curtain Sync mode. Fantastic, I though it is not possible but it works with AF240Z! However it works not as a trailing sync but similar to Slow Sync - it flashes at the beginning, not at the end. Actually, it does the same with Slow Sync. Should it be like that or I do something wrong?
Thanks for the help
Comment by misiek_knm posted on Pentax AF240Z on K20D at 01/10/2009 - 21:30
Have a look here, which will explain the differences.
http://www.bdimitrov.de/kmp/technology/hot-shoe/index.html
On the K20D, Program mode won't work, but Auto mode will, provided you set the camera body to Manual. In my experience, Auto mode works just as well as TTL and P-TTL.
Auto will of course take account of any diffusers you may wish to put on the flash.
Experimentation is the key.
Good luck.
G
By the way how flash 'knows' about diffusers? I thought that the sensor is below the flash 'window' (how should I name that part?) so it cannot notice any filter on a top of it? Then I wonder how it recalculates the power needed when bouncing the light up?
Comment by misiek_knm posted on Pentax AF240Z on K20D at 01/10/2009 - 21:06
I know it's not TTL, so far so good - it wouldn't work on K20D anyway. But it has 3 modes:
P (Program)
A (Auto)
M (Manual)
Now I've read the manual and looked at some archival posts, but still cannot make any difference between A and P apart of aperture setting (4.0 or 5.6). The manual says that in P mode flash should set aperture - but in the fact it doesn't. Both A and P mode seem to work in the same way, they don't touch aperture at all, while set shutter to 1/80s in (camera) Av mode and 1/180s i (camera) M mode (but then I can change it). In these 2 settings flash power is adjusted to the camera settings and flash angle.
In flash M mode it always fires with full power and I have to compensate with camera settings (aperture, ISO and shutter) - I can use the tables at flash's back to calculate the numbers. There is no way to modify the flash power.
Do I misunderstand / miss something?
Comment by misiek_knm posted on Pentax AF240Z on K20D at 30/09/2009 - 22:38
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