TTL is fine but a lot of people do Macro with strobes (myself included), and I am not aware of any SLR cameras that can do TTL flash metering.
My technique is I use a flash meter, calculate bellows factor exposure compensation, and determine a base fstop. But even then I usually bracket unless I have used exact same lighting setup, film speed, lens and magnification, etc. I would imagine with a DSLR its just a matter of running a few exposures and adjust fstop until you get what you want on the image review screen. JCO -----Original Message----- From: Rob Studdert [mailto:[EMAIL PROTECTED] Sent: Monday, November 15, 2004 8:46 AM To: [EMAIL PROTECTED] Subject: RE: A Question About Macro Lenses On 15 Nov 2004 at 7:23, J. C. O'Connell wrote: > Unless the 125mm zoomed out to 62.5mm at 1:1, it is > going to need exposure compensation. Of course you are correct, I was simply drawing a relative comparison to another lens. > What you have is essentially > a variable aperture zoom with that lens, how do > do you know what exposure compensations to use? I don't really care but I do know now that relative to a "non-zoom" macro lens it requires about an extra half stop when approaching 1:1. I haven't used external meters for macro photography since the late 80's. Then I had a 67 and bellows and I was glad to get my hands on a TTL prism. > Does the lens barrel have exposure compensation > markings on it? No > At least with a fixed focal length and aperture you > can calculate the correct compensations based on magnification or > bellows extension, but with variable aperture those techniques won't > work... ..or you (I) could use the TTL metering, which I do quite successfully. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
