All DSLR camera manufacturers have problem to ensure accurate focus with
different lenses, in the film age no one notice about it but the problem
can't hide when pixel count increases in digital age. That's why we have
focus calibration on the latest DSLRs. Even so I don't think it works in all
condition, the Tamron 70-300 I had was working fine with my 5D II at day
time but focus shift with tungsten at the short end.
I think mirrorless camera is the way to go, the focus of my E-PL1 is
extremely accurate even under very poor light.
C.H.Ling
----- Original Message -----
From: "Joel Wilcox" <jfwilcox@xxxxxxxxxxx>
> On Mon, Feb 6, 2012, at 09:04 AM, Johnny Johnson wrote:
>> Nothing really to suggest Joel. It could well be that the latest adapters
>> offer better FC than my four year old ones.
>
> OK. The Rainbow Imaging adapter for OM seems to focus consistently
> enough, but it is just off by too much to be trusted. But the Big_Is
> one is really good. I figure you can't fake success when it comes to
> focusing. I've ordered a second Big-Is for OM and another for N*kon.
>
> Interestingly, the Rainbow Imaging adapter for N*kon is excellent. I'm
> getting sharp results with lenses that I thought were basically just a
> bit soft. I remember reading a thread on the N*kon list way back when
> suggesting that M*kon designed the cameras to over-focus slightly. This
> seemed ludicrous to me at the time, but now I wonder.
>
> Joel W.
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