I'm interested to know if there are any limitations when shooting with a manual aperture lens in aperture priority mode, compared to shooting with a fully automatic lens.
In case this isn't clear, the lens has a ring that sets the aperture. There is no wiring to communicate aperture information to the camera, so the camera does not know what the aperture is.
Questions I have when using aperture priority mode:
- Is the camera able to calculate the exposure with this lens?
- Does TTL flash metering work?
- Can I bracket the exposure?
Edit: while I'm interested in general about how cameras support this configuration, I need to have this information for Canon DSLRs, specifically the 60D.
Answer
Aperture priority mode works just fine with a manual lens (or no lens at all) on my Canon 550D so I assume it will work on a 60D
What happens is that the camera display shows an aperture of "F00" and the camera will set the shutter speed based on the amount of light it can see (making the result picture exactly the same as if you set the aperture in the camera).
Note that the viewfinder will be darker than with an electronic lens because it will also use the aperture you set (normally the viewfinder always uses the max aperture and the camera only stops down when you press the shutter or the DOF preview button)
My experience with this is in shooting macro pictures with an hand held reversed lens (from the point of view of the camera no lens at all) and the metering works just as well as it does with a lens attached.
So:
Can the camera calculate exposure - absolutely yes.
Does TTL flash metering work - yes, with the same rules as Av mode with a lens (shutter speed will be the same as with no flash, flash used for fill).
Can I bracket exposure - Yes (just tested it now, never tried to use bracketing with no lens before).
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