This week I went out to shoot the moon. To compensate for my lack of a long zoom lens I used my dads old SOLIGOR ZOOM&MACRO 60-300/f4-5.6 lens for Nikon and a 2x Danubia teleconverter also for Nikon and mounted it on my Canon 7D with a converter.
When I was out shooting, I wanted to focus the moon using the live view feature but I found that it was completely black (I made sure live view was really on). The picture I took then however turned out to be exposed pretty well.
Aperture: f/11 --> but hard to tell due to the converter
Canon Firmware: 2.0.6 --> should be the newest
So now I'm left wondering if there is a problem with my camera or if the situation I encountered is the aftermath of me using an old lens and converter for a different system.
I found this thread (http://www.dvxuser.com/V6/archive/index.php/t-247001.html) that discusses a similar problem also with manual lenses for the 60D and the 550D. Could I have the same issue with my 7D? Or is it even a known issue?
I did a couple of tests with the setup and noticed that generally the final images are brighter than what the live view shows. Is there a reasonable explanation for all of this e.g. the thread I've found? Or do I need to worry about my camera?