jaapv Posted November 9, 2007 Share #1 Posted November 9, 2007 Advertisement (gone after registration) When I have the Visoflex mounted, when I release too quickly, i.e. pass from half-depressed to release, the M8 reverts to a 15 sec exposure. (so I don't do that , I normally expose manually). It made me think: does the external exposure meter, the famous blue dot, preset the AE to a basic value to enable fast metering? The Visoflex, of course, covers the blue dot. Does the 135/2.8 have the same quirk? Link to post Share on other sites More sharing options...
Advertisement Posted November 9, 2007 Posted November 9, 2007 Hi jaapv, Take a look here AE preset?. I'm sure you'll find what you were looking for!
stunsworth Posted November 9, 2007 Share #2 Posted November 9, 2007 Hi Jaap, I'm guessing that all that's happening is that the camera is calculating the exposure before the Visioflex mirror has moved totally out of the way and it's therefore blocking a lot of light from the meter. I can't see how the blue dot can be used in calculating the exposure, the camera doesn't know what aperture the lens is set to. Link to post Share on other sites More sharing options...
jaapv Posted November 9, 2007 Author Share #3 Posted November 9, 2007 Hi Jaap, I'm guessing that all that's happening is that the camera is calculating the exposure before the Visioflex mirror has moved totally out of the way and it's therefore blocking a lot of light from the meter. I can't see how the blue dot can be used in calculating the exposure, the camera doesn't know what aperture the lens is set to. I realise that, but why the consistent 1/15th then? When I have the mirror adjusted to be too slow to get out of the way, of course the same thing happens, but then exposure is all over the place. I deduce that the blue dot, by measuring ambient light , has a function in presetting a certain measuring range, based upon an aperture range from say f 1.0 to f 22. Or is that too much of a "conspiracy theory"? After all, the blue dot does something similar in M-TTL. Link to post Share on other sites More sharing options...
stunsworth Posted November 9, 2007 Share #4 Posted November 9, 2007 Japp, try taking a shot with an M lens mounted and the lens cap on, you'll get a 30 sec exposure, so I don't believe the blue dot is involved in the exposure. I may be missing something in your previous message, but a preset exposure range to cover from f1-22 would be a very big range <grin> Link to post Share on other sites More sharing options...
jaapv Posted November 9, 2007 Author Share #5 Posted November 9, 2007 OK - still I wonder about the consistent 1/15th.... Link to post Share on other sites More sharing options...
luigi bertolotti Posted November 14, 2007 Share #6 Posted November 14, 2007 Me too experienced some strange problem using AE on Viso... thought it was related to the mirror movement... some reflection during the flip-up that maybe gets fooled the measurement... I prefer to set manually the exposure. I do not think is related to the blue dot: with the goggled Elmarit 135 2,8 all is normal (even if I really don't like so much this lens.. much better the TE...). But I have not understood if the time you apparently are "locked into" is 15 sec or 1/15... Link to post Share on other sites More sharing options...
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