----- Original Message -----
From: "Henning Wulff" <[EMAIL PROTECTED]>
> At short distances GN don't work the same way; with ring flashes even
> less so. GN calculations are predicated on the flash being
> effectively a point source. I have a ML-14, but with that unit and
> 100ISO, it starts tending to underexposure at less than f/16
> effective at 1:1 without compensation on my EOS3. At 1:1 I generally
> can only shoot at an effective f/22 with full power on both sides of
> the flash.
Thanks for the reply Henning.
When you say 'effective f/22'; do you mean you set f11 on the camera (works
out to ~f22 effective at 1:1)?
That should explain why I'm not getting any good exposure using f16 with the
weaker (than the ml-14) ml-3.
I have played around with the same setup, without film (~3x enlargement) and
noticed that the green confirmation light does light up for anything lower
than f8. I think photos will still be severely underexposed, though since
the slides I got back were at least 3 stops under. I plan to do some more
tests on the weekend using film.
The problem is that at f8 and 3x enlargement the DOF is basically nothing!
:-( Time to start saving for that MT-24 twin flash! (Hope to be able to get
the MPE-65 at some stage as well)
Do you perhaps know how to calculate working flash distances in a macro
setup, or point me to a site where I can read more?
Regards
Thys
---------------------------------------------------------
Thys van der Merwe
Portfolio of African Images:
http://mysite.mweb.co.za/residents/teknovis
Cell: (+27) 83-441-3108
Tel: (+27) 35-753-3766
Fax: (+27) 35-753-4489
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