Does that mean I have to expose at f/5.6 to avoid refraction problems when
fully extended?
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Sunday, June 24, 2012 9:05 AM
Subject: Re: [OM] IMG: More Skippers
> The equation accounts for it perfectly... it's just that you have to
> compute the effective focal ratio. Not hard actually if you refer to
> your macro lens's exposure table. If it says to increase the exposure
> by a factor of two at a given extension then the effective f-stop is one
> stop smaller than indicated. If it's reading f/8 then it's actually f/11.
>
> Chuck Norcutt
>
>
> On 6/24/2012 12:16 AM, Jim Nichols wrote:
>> Thanks, Chuck. You expressed it in a nutshell, which I appreciate.
>>
>> Probably the best image I ever made with this camera/lens combination, at
>> least the one that gathered the most compliments ( and contained no
>> senoritas) was a shot of a red Canadian Beech Staggerwing cranking up.
>> It
>> was shot at f/10, so I suspect that f/8-f/9 is about right for the upper
>> limit. The link to that image is given below:
>>
>> http://gallery.leica-users.org/v/OldNick/Staggerwing+Cranking+NI.jpg.html
>>
>> Just to ponder a bit, a macro lens extends quite a bit on closeups,
>> effectively increasing the f-number. How does your equation account for
>> that?
>
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