Hello,
I got a Sigma 105m macro made for older slr A mount cameras that I use in a sony Alpha 7 with the LA-EA3 adapter.
The thing is, while aperture works OK, its in 'real time', meant that the closer the aperture is, the darker the image in the screen and viewfinder is too.
So shooting in macro mode with a ring flash its almost impossible because at 1/160 at f11 in ISO 100, any image is black dead.
In others camera/lenses, in can set the 'aperture preview' on or off (so in off mode the diafragm will close to the selected aperture only at shooting, allowing to set up a bright clear image).
I can't find any option of this kind in this camera. Somebody can confirm that it doesn't exist? I find it really weird...
Thanks in advance.
Live view will show you the image in live, but 'adapted' to the settings you're using. So it will be too dark.
In the past you had camera bodies that let the aperture in full until you shoot, and had a button to preview the depth of field (a button that closed the diafragm to the aperture choosed).
If you shoot in aperture or speed priority you will enjoy a bright image in the screen even if you choose f11, so technically its always possible to have the same in manual mode....
But of course nothing of this works when you're using an external ring slave flash like the metz.