'm not sure if I can use TTL at wide aps. I'll try it tonight when I get home from work. I know I can use P TTL at wide aps with the Sigma 500 Super.
Paul
On May 12, 2005, at 8:11 AM, Dario Bonazza wrote:
Hi Paul,
My question has nothing to do with AF400T and P mode.
My question mainly deals with AF500FTZ (or AF360FGZ, or built-in flash) and Av mode, for using fast apertures in order to increase flash range and/or reduce flash recycling.
So, when you write that your TTL flashes work fine in all shooting modes, what do you mean?
Are you able to use TTL? If so, can you use fast speeds or are you forced to stop down to f/5.6 or so?
Thanks,
Dario
----- Original Message ----- From: "Paul Stenquist" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, May 12, 2005 1:28 PM
Subject: Re: Flash issue (was: The first DS impressions)
I don't think I've tried shooting in P mode with the AF400T. I'll have to give it a try and see what happens.
Paul
On May 12, 2005, at 7:13 AM, Dario Bonazza wrote:
Paul Stenquist wrote:
I have an *istD, but I've found that my TTL flashes work fine in all shooting modes at speeds of 1/150th or less. They seem to perform slightly better at ISO 400 than at other settings, but that's hard to determine for certain. The unit I've used most often is the Pentax AT400. Of course the normal variables of flash photography apply. I think this has caused a lot of people to conclude that the camera doesn't handle TTL very well. The Sigma 500 Super, which is a Pentax dedicated flash, works very well in every mode I've tried, including high speed synch, p-ttl, ttl, and trailing curtain.
My experience (with *istD + AF500FTZ) is that if you set P mode on the camera, the lens will be automatically stuck onto f/5.6 (even when using say f/1.4 lenses!) and flash exposures will turn out acceptable. If you try using faster apertures (e.g by using Av mode), the pictures will be hopelessly washed out. Looks like the camera TTL is unable to control the flash output and overcomes that by controlling the lens aperture (just a guess). This happened with 2-3 different cameras (*istD). Not tried the *istDs yet.
Anyone having such experience? Any advice for using fast lenses in order to increase the flash range/reduce recycling time?
Pentax adviced me to use an older flash (AF400T, AF280T) featuring auto (non-TTL) exposure ;-( Clever, isn't it?
Dario
