Thanks. That will be quite handy.
Chuck Norcutt wrote:
>Earl Dunbar wrote:
>
>
>
>>...I haven't done a lot of shooting using hyperfocal distance for
>>awhile, so I'm hoping that I'll be able to recover that skill quickly
>>enough.
>>
>>
>
>
>
>>I plan on taking the 35SP and an OM-1n (or perhaps a 2n) with the 28/2.8
>>or 28/3.5 and /maybe/ the 21/2. I need to travel very light, so unless
>>anyone has other suggestions, this is the kit. Hyperfocal focusing
>>should be pretty easy with the wides on the OM, and slightly more fussy
>>on the SP w/ it's perfect 42mm focal length. ;-)
>>
>>
>----------------------------------------------------------
>
>Hyperfocal table good enough for 8x10.
>Near focus = 1/2 hyperfocal distance.
>Far focus = infinity.
>
> Hyperfocal distance in feet
>f/ratio 42mm 28mm 21mm
>======= ===== ===== =====
> 2.8 62 28 16
> 4 44 20 11
> 5.6 32 14 8
> 8 22 10 5.5
>11 16 7 4
>16 11 5 2.8
>
>Since you have lenses here which are a factor of 2x apart in focal
>length it is easy to see the relationship of hyperfocal distance and
>focal length. Cutting the focal length by a factor of 2 causes the
>hyperfocal distance to shrink by a factor of 4 or 2 squared. Opening
>the lens by two stops causes the hyperfocal distance to shrink by a
>factor of 2 and opening one stop by a factor of 1.4 or the square root of 2.
>
>Enjoy,
>Chuck Norcutt
>
>
>
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