> Miha Valencic wrote: ... > Now, the confused part. Without extension tubes, I get 1/60 @ f/4. > When I put 12, 20 or 36 mm tube on it, I still get 1/60@ f/4. > Confusing. > I then switched to 28-135. > I got 1/90 @ f/4 without the tube. Notice the difference? > 1/45 @ f/4 with 36 mm tube. > 1/60 @ f/4 with 20 and 12 mm tube.
I tried a similar experiment with my Elan 7E, EF 50mm f/1.8 II, and Kenko tubes, and got the following (expected) results: Lens alone: 1/60 f/4 Lens + 12mm: 1/60 f/3.5 Lens + 20mm: 1/60 f/2.8 Lens + 36mm: 1/60 f/2.5 Lens + 48mm: 1/60 f/2 So, I am worried about some aspects of your method that showed no exposure difference where there should have been one. Further, 1/60 f/4 is a very typical E-TTL setting for flash-only exposure. Consider me paranoid, but just in case: 1) Did you use P mode (evaluative)? 2) Did you remember that * also activates AE lock? 3) Did you remember to cover the viewfinder? Cheers Julian Loke * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
