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DOF calculator

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Franky

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Feb 17, 2009, 4:50:51 PM2/17/09
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Does anyone know where to find a good DOF calculator?

Many thanks

Frank

Alan Browne

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Feb 17, 2009, 6:30:37 PM2/17/09
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Franky wrote:
> Does anyone know where to find a good DOF calculator?

Ever hear of Google?

Here's one I've used before: http://tangentsoft.net/fcalc/

An online calc.
http://www.bobatkins.com/photography/technical/dofcalc.html


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Alan Browne

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Feb 17, 2009, 11:24:18 PM2/17/09
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j.f. wrote:
> In article <gKednenNBJUA1QbU...@giganews.com>,

> Alan Browne <alan....@Freelunchvideotron.ca> wrote:
>
>> Franky wrote:
>>> Does anyone know where to find a good DOF calculator?
>> Ever hear of Google?
>
> I think, Alan, that before we are so quick to spank people for not
> having used google,

Since I pointed out two, one that I know is quite good (f/calc) and
another that can be run in a browser, I don't need lectures from the
likes of you. Beyond that there is nothing magical about dof
calculators. Anyone with grade 9 algebra can do his own in a
spreadsheet or write his own little program. Possibly even you.

Michael

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Feb 18, 2009, 12:56:53 AM2/18/09
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On 2009-02-17 23:24:18 -0500, Alan Browne
<alan....@Freelunchvideotron.ca> said:

> j.f. wrote:
>> In article <gKednenNBJUA1QbU...@giganews.com>,
>> Alan Browne <alan....@Freelunchvideotron.ca> wrote:
>>
>>> Franky wrote:
>>>> Does anyone know where to find a good DOF calculator?
>>> Ever hear of Google?
>>
>> I think, Alan, that before we are so quick to spank people for not
>> having used google,
>
> Since I pointed out two, one that I know is quite good (f/calc) and
> another that can be run in a browser, I don't need lectures from the
> likes of you. Beyond that there is nothing magical about dof
> calculators. Anyone with grade 9 algebra can do his own in a
> spreadsheet or write his own little program. Possibly even you.

Am I helplessly out of date, or don't the lenses have the DOF
information engraved on the barrels? At least the lenses I use on my
35mm SLRS have that.
--
Michael

Franky

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Feb 18, 2009, 7:51:26 AM2/18/09
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Thank you all for your input, and thank you for the adviced calculators.

Frank


"Michael" <adunc...@mypacks.net> wrote in message
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Franky

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Feb 18, 2009, 7:51:42 AM2/18/09
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Thank you all for your input, and thank you for the adviced calculators.

Frank


"Michael" <adunc...@mypacks.net> wrote in message
news:2009021800565316807-adunc79617@mypacksnet...

Franky

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Feb 18, 2009, 7:51:16 AM2/18/09
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Thank you all for your input, and thank you for the adviced calculators.

Frank


"Michael" <adunc...@mypacks.net> wrote in message
news:2009021800565316807-adunc79617@mypacksnet...

Alan Browne

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Feb 18, 2009, 10:56:00 AM2/18/09
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Michael wrote:

> Am I helplessly out of date, or don't the lenses have the DOF
> information engraved on the barrels? At least the lenses I use on my
> 35mm SLRS have that.

The lens marking on many lenses are useless for accurate DOF prediction.

My Hasselblad lenses have great DOF scales. My Minolta/Sony lenses have
useless DOF scales - likewise the high end Nikon 28-70 f/2.6 lens I just
sold.

However, the other reason for a DOF calculator is planning shoots,
making sure you have the right lens for the job (or re-plan the shooting
geometry).

Further, DOF markings are set for prints of about 8x10 inches. If you
intend to print at other sizes, then a DOF calculator will help you find
the change in aperture needed.

And further still, if using a "full frame" lens on a cropped sensor
body, the enlargement ratio changes, so the lens DOF markings are off.

Franky

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Feb 18, 2009, 4:39:51 PM2/18/09
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Hi Alan,

Thank you for the infos. I'd be interested in creating my own DOF
application. I'm not a programmer but I am creating websites, and I learn
pretty fast. Could you perhaps tell me which program/language to use (for a
beginner) to make such DOF claculator?

Many thanks

Frank


"Alan Browne" <alan....@Freelunchvideotron.ca> wrote in message
news:qaednScoyuLvEAbU...@giganews.com...

Alan Browne

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Feb 18, 2009, 5:26:46 PM2/18/09
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Franky wrote:
> Hi Alan,
>
> Thank you for the infos. I'd be interested in creating my own DOF
> application. I'm not a programmer but I am creating websites, and I learn
> pretty fast. Could you perhaps tell me which program/language to use (for a
> beginner) to make such DOF claculator?

I suggested the tangentsoft f/calc app to download.
http://tangentsoft.net/fcalc/

In its help section you will find all of the equations (which you can
also find at wikipedia and a dozen other places). Just remember that
the units have to be taken with care: use the equations directly in mm
and you will have the least problems. That is to say, if the focus
distance is 8 meters, then it is 8000 mm used in the equations "as is".

Further, a CoC value of about 0.03mm is a good place to start ... oh,
0.025 for cropped sensors, I guess.

I'm not much of a web programmer (more old school
Fortran/Pascal/Assembler type), but many web compositing packages
support simple computations such as these.

Don't top post.

Franky

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Feb 18, 2009, 5:32:32 PM2/18/09
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Thanks for that.

Frank

"Alan Browne" <alan....@Freelunchvideotron.ca> wrote in message

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