That's quite instructive. In the 3rd picture, though, you write "Flash adjusts output to keep the foreground subject correctly light". The flash doesn't need to adjust the output - for the same distance and aperture the flash output should remain constant, and TTL isn't needed.
Bob > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of George Sinos > Sent: 01 June 2008 17:14 > To: Pentax-Discuss Mail List > Subject: GESO - Balancing flash with available light > > Balancing flash with available light. > > This is a gallery of a few shots put together for a class drill. The > idea is to light the foreground subject with the flash and the > background with available light. The lightness/darkness of the > background is controlled by changing the shutter speed. The aperture > is held constant for all photos. The P-TTL flash keeps the subject lit > at the desired level. > > For the Pentax folks here's a little additional info. > > The Flash is a 540 set in the wireless mode. It's set to +1/2 stop > flash exposure compensation. It's zoomed in as far as possible to > narrow help keep light from spilling onto the background. There are > only seven images in the gallery, but I did a lot of experimenting and > fired the shutter just short of 100 times. The flash is very close to > the subject so it probably didn't need to use much energy. Even when > I was experimenting with very small apertures requiring noticeably > more powerful flashes the flash recycled almost immediately. The AA > alkaline batteries seemed to work OK for this application. > > The lens is the DA* 50-135mm f/2.8. The focus point is the black > queen in the back row. > > The camera is the K20d, flash set to wireless control mode. Manual > mode for this series. Though I had set the white balance to daylight, > it didn't make any difference. I had custom setting at "WB auto when > flash attached." I've since set it to "unchanged" so it will use the > WB as set on the camera. No matter, I was shooting raw files. > > Here's the link > > <http://Georges.smugmug.com/gallery/5066768_nv8WE/1/304882093_iUGLx> > > Oh, the opening image documenting the setup was shot with a Canon G9. > > This was time well spent, if only to learn about the custom settings > on the camera and flash that interact. I've only had the K20 and 540 > for a short time. > > GS > <http://www.georgesphotos.net> > > -- > 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. > > -- 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.
