It doesn't know which aperture you choose. You do. It assumes. If you set the ISO on the back of the flash to the ISO you are going to use, (it tops out at 800). The red and green scales, (the red and green bars under the fstop scale), look something like this (forgive the crappy text graphics).
______w__I__t Green (High Power) __________w__I__t Red (Low Power) On the sliding scale Pick the nearest f stop to the tall center uptick either red or green depending on where you set the auto/power setting. The flash assumes that setting. The meter and feet values tell you the minimum, (where the horizontal bar begins), and maximum, (where the uptic, index mark), distance that the flash sensor will give a good exposure. You can extrapolate the f stop values higher ISOs but you kind of run out of f stops at distances where the sensor is guaranteed to work. Boris Liberman wrote: > Cory, when you say "work well" you mean that flash measures the light > on its own and it gives correct exposure as a result, right? If so, > how does flash knows which aperture I chose? > > Thanks. > > On 9/24/07, cbwaters <[EMAIL PROTECTED]> wrote: > >> Boris, >> I have both the AF 200T and the 280. They both seem to work well in their >> "auto" setting with my K10. Of course, TTL is out, but I think I used them >> mostly in auto on the *istD anyway. >> >> Cory >> >> ----- Original Message ----- >> From: "Boris Liberman" <[EMAIL PROTECTED]> >> To: "Pentax-Discuss Mail List" <PDML@pdml.net> >> Sent: Monday, September 24, 2007 5:58 AM >> Subject: Thinking of AF280T flash >> >> >> >>> Hi! >>> >>> I have AF220T unit which is a good flash, but it can only give me a >>> full discharge on K10D. I don't want to buy either 540th or 360th >>> flashes. They are too expensive and 360th does not swivel. >>> >>> It seems that AF280T has both manual control on the power of discharge >>> and its own light sensor. Do you think it would be a reasonable flash >>> for K10D (in fully manual mode) that both tilts and swivels and can >>> measure light on its own for better exposure? >>> >>> Anyone on the list using AF280T with their K10D? Anyone willing to enable >>> me? >>> >>> Thanks. >>> >>> -- >>> Boris >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> PDML@pdml.net >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> >>> >>> -- >>> No virus found in this incoming message. >>> Checked by AVG Free Edition. >>> Version: 7.5.488 / Virus Database: 269.13.28/1023 - Release Date: >>> 9/22/2007 1:27 PM >>> >>> >>> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> >> > > > -- Remember, it’s pillage then burn. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
