That's not what my DOF calculator says. If you can quantify it with a
specific example I'll believe it. But I don't think you can. The
example I used was a 100mm lens at f/8 focused at 10 feet with a CoC of
30 lines/mm. That yields a DOF of 1.58 feet. Then a 50mm lens at f/8
also focused at 10 feet but with a CoC of 60 lines/mm. That's to allow
for a smaller image size (sensor) to be blown up twice as much as the
100mm shot such that the final print size (magnification) is the same.
The 50mm lens gets a total DOF of 3.28 feet. Slightly more than double.
Chuck Norcutt
On 12/18/2010 8:32 PM, C.H.Ling wrote:
> I do think it is the sensor gives the increased DOF not the lens, for the
> same magnification, a 50mm lens and 100mm lens have the same DOF under the
> same aperture but the one with smaller sensor gives deeper DOF.
>
> C.H.Ling
>
> ----- Original Message -----
> From: "Chuck Norcutt"<chucknorcutt@xxxxxxxxxxxxxxxx>
> To: "Olympus Camera Discussion"<olympus@xxxxxxxxxxxxxxxxx>
> Sent: Sunday, December 19, 2010 12:46 AM
> Subject: Re: [OM] Jeweler's camera
>
>
>> It's the short focal length that gives the increased depth of field, not
>> the sensor. But small sensors and short lenses do go together.
>>
>> Chuck Norcutt
>>
>>
>> On 12/17/2010 11:33 PM, Andrew Fildes wrote:
>>> Yes, the compact size sensor on the G12 gives a deeper DOF and I forgot
>>> to mention - articulated screen. Don't do macro without one!
>>> I'd imagine a tabletop set up with cube. mini-lights and table tripodfd
>>> for very small items, all easily repeatable on a budget. I like to put a
>>> small box in there and drape it with velvet offcuts for bright jewellry.
>>> The cube tents usually come with a drop-down front panel with hole for
>>> lens. Good for anything shiny but also for any small and colourful
>>> object.
>>> Andrew Fildes
>>> afildes@xxxxxxxxxxxxx
>>>
>>>
>>>
>
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