Originally posted by geru2000 Why would anyone have their flash up and change a lens at the same time? I assume that they probably still had the camera powered up also since they didn't say it was turned off?
I'm sure changing a lens with power on is not recommended in fact there is warning in the camera manual.
Even the if the camera were powered off why does the flash remain up?
Perhaps I wasn't clear.
What I'm trying to do is a fairly common configuration for shooting macro. You mount a lens backwards onto a set of extension tubes. One way to do this is to use a reversing ring, The reversing ring
has a body mount on one side, and filter threads on the other, so you just screw the filter threads of the lens onto the ring, and then mount the ring onto the camera body ( or the extension tubes ).
This configuration isn't great in terms of collecting light, so the flash is helpful - especially if you construct something to channel the light from the flash to the area directly in front of the reversed lens where
you subject will be located. This is what I was doing.
Because the reversing ring is anodized, this configuration ends up looking, to the camera, as though there's no lens mounted.
It is ( IMHO ) a bug because:
a) the configuration works when the flash is not activated. You shouldn't have one behaviour with the flash up and another behaviour with the flash down
b) the response shouldn't be camera lock up. I could see disabling shutter release until a lens is correctly mounted, but not lock-up
It looks like I was incorrect - no lens mounted doesn't recreate the scenario.
I just tried the following:
1) no lens mounted - camera functions ( flash up or down ) - OK
2) reversing ring mounted directly on camera body ( flash up or down ) - OK
3) extension tubes with nothing else ( flash up ) - lock-up
4) extension tubes with nothing else ( flash down ) - OK
5) extension tubes with reversing ring ( flash down ) - OK
6) extension tubes with reversing ring ( flash up ) - lock-up
7) extension tubes with old M series lens mounted normally ( flash up or down ) - OK
So it has something to do with the extension tubes being mounted with no lens ( or a reversing ring that looks like no lens ).
Sorry for the confusion.