Quote:
Originally Posted by NickR
Hi Roy, I had a quick go this morning with the 300mm + 2.0x and 1.4x, AF was not that good, a lot of hunting. I can't get my head round what the aperture/exposure is doing, I know the camera says f/5.6 but is this true or should this really be f/8 or are all the auto exposure settings wrong when stacking tc's?
Cheers
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No need to worry about exposure Nick - with TTL metering the camera take the light reading through the lens, you do not have to compensate in any way. As far as the aperture goes, you are shooting at f8 - the fact that the camera says f5.6 is irrelevent to the process (in your case it is only seeing the tc that is attached to your camera). When I use any tc on my f5.6 lens I have to tape the pins to fool the camera into not knowing it is there to retain AF - it will always say f5.6 but it does not make a jot of difference.