And that's only the labeled f/stop. The actual f/stop is only valid at
infinity. The effective f/stop get numerically larger as the extension
increases.
Chuck Norcutt
On 5/31/2013 12:00 PM, Mike Lazzari wrote:
>> diffraction blurring is not to be worried about in most cases.
> In my experience anything beyond f16 is to be avoided if possible.
> Kinda hard to avoid with macro. Sometimes the tradeoff is worth it
> though. Why else did they put f45 on the 135 macro??
>
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