Because if you don't need infinity wide-open, there's no need to file down
the ring. Focus to less than infinity and stop down. Increased DOF gets
infinity, and mirror doesn't hit back of lens.
On 5/9/13 12:50 AM, "olympus-request@xxxxxxxxxxxxxxxxx"
<olympus-request@xxxxxxxxxxxxxxxxx> wrote:
> It's my understanding that the reason for filing
>the rear ring down is to make clearance for the 5D's oversized mirror
>when the lens is at infinity. I don't see how "wide open" has anything
>to do with it.
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