# Infinity Focus

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#### megascriler

##### New Member
Why is it necessary to even focus again once focus has been set to infinity? Shouldn't everything just be sharp?

#### Del_CtrlnoAlt

##### Senior Member
megascriler said:
Why is it necessary to even focus again once focus has been set to infinity? Shouldn't everything just be sharp?
things that are near are not sharp, aka those before the infinity.

#### solarii

##### New Member
Do a search for the following:

hyperfocal distance.

Let there be light :angel:

#### pai

##### New Member
oh no, not again... (not the question, but the different possible interpretations)

hi megascriler, when you say "infinity focus" do you mean "focus at infinity", ie very far away objects, or hyperfocal distance, which is about how to get a lot of the image in focus, from foreground to background?

#### Zaknafein

##### New Member
i think he meant hyperfocal distance... where subjects from distance X metres to infinity is focused. subjects before distance X will not be sharp if hyperfocusing is used.

btw pai, i love ur sig hahaha.

#### Artosoft

##### Senior Member
Zaknafein said:
i think he meant hyperfocal distance... where subjects from distance X metres to infinity is focused. subjects before distance X will not be sharp if hyperfocusing is used.

btw pai, i love ur sig hahaha.
Allow me to do correction.

http://en.wikipedia.org/wiki/Hyperfocal_distance

Regards,
Arto.

#### lastboltnut

##### Senior Member
I read about the hyperfocal distance thingy....but how to apply? If say for example I calculated and know that at a particular setting of my camera, my hyperfocal distance is 16m, then by theory I should set my focus to 16m. then can I say that I can be sure that the objects from 8m to infinity will be sharp?

thanks.

#### Artosoft

##### Senior Member
lastboltnut said:
I read about the hyperfocal distance thingy....but how to apply? If say for example I calculated and know that at a particular setting of my camera, my hyperfocal distance is 16m, then by theory I should set my focus to 16m. then can I say that I can be sure that the objects from 8m to infinity will be sharp?

thanks.
Where you get 8m? Is it from the calculation for Near Distance? If yes, it should be correct.

For easy to calculate DoF and hyperfocal, you can use this program:
http://www.davideubank.com/

pCAM, I wrote that program, but only for PalmOS device. Not the PC. If you can download palmOS emulator, you can run it on PC.

Regards,
Arto.

#### lastboltnut

##### Senior Member
Hey Artosoft! You are great! I am a palm user too, so I can use your pCAM!! Freeware huh?

Thanks for the info!!

By the way, I type wrongly, since hyperfocal distance is 16m, then I should focus to 16m and then expect objects from 8m-infinity to be sharp....right?

Artosoft said:
Where you get 8m? Is it from the calculation for Near Distance? If yes, it should be correct.

For easy to calculate DoF and hyperfocal, you can use this program:
http://www.davideubank.com/

pCAM, I wrote that program, but only for PalmOS device. Not the PC. If you can download palmOS emulator, you can run it on PC.

Regards,
Arto.

#### Artosoft

##### Senior Member
lastboltnut said:
Hey Artosoft! You are great! I am a palm user too, so I can use your pCAM!! Freeware huh?

Thanks for the info!!
Is not freeware . Shareware. But, it is only give you nag screen every time you run it. It is not a crippled software even if you are not registered.

Hope it is usefull for you .

Regards,
Arto.

#### lastboltnut

##### Senior Member
Oic...I have just downloaded it, will try later...Thanks again!

#### lastboltnut

##### Senior Member
Hi Artosoft,

I tried your software, it is very good! Very fast and I dun have to use Excel to do the calculation on the move anymore!!

By the way, I got info from a website saying Canon S3 IS has COC of 0.005mm (5 micron), is it possible?? Is it too fine?

Thanks.

#### solarii

##### New Member
pai said:
oh no, not again... (not the question, but the different possible interpretations)

hi megascriler, when you say "infinity focus" do you mean "focus at infinity", ie very far away objects, or hyperfocal distance, which is about how to get a lot of the image in focus, from foreground to background?
Not to fret... both infinity focus and hyper focal distance are inter-related although they refer to different things.

You can't explain the concept of hyper focal dist without first understanding what infinity focus is, so by reading up, its like killing 2 birds with 1 stone

Anyway it takes some time to decrypt newbie codes.... if they knew how to describe it precisely, they'll probably know whats going on and won't have to ask in the first place!

#### yanyewkay

##### Senior Member
pai said:
oh no, not again... (not the question, but the different possible interpretations)

hi megascriler, when you say "infinity focus" do you mean "focus at infinity", ie very far away objects, or hyperfocal distance, which is about how to get a lot of the image in focus, from foreground to background?
relax and be tolerant to newbies.

#### Artosoft

##### Senior Member
lastboltnut said:
Hi Artosoft,

I tried your software, it is very good! Very fast and I dun have to use Excel to do the calculation on the move anymore!!

By the way, I got info from a website saying Canon S3 IS has COC of 0.005mm (5 micron), is it possible?? Is it too fine?

Thanks.
Since I believe Canon S3 IS have a small sensor compare to film or APS-C size or DX size sensor, it is possible. Do you know exactly the size of S3 sensor? Probably I can calculate it.

For Nikon DX, my calculation for CoC is 18micron. Canon APS-C will be smaller (I guest it is 16micron).

If anyone have better or exact calculation for digital size sensor, please let us know. Thx.

Actually, now I am using PocketPC. But I run pCAM through StyleTap:
http://www.styletap.com

Regards,
Arto.

#### yanyewkay

##### Senior Member
this site is more user-friendly http://www.dofmaster.com/

#### Zaknafein

##### New Member
solarii said:
Not to fret... both infinity focus and hyper focal distance are inter-related although they refer to different things.

You can't explain the concept of hyper focal dist without first understanding what infinity focus is, so by reading up, its like killing 2 birds with 1 stone

Anyway it takes some time to decrypt newbie codes.... if they knew how to describe it precisely, they'll probably know whats going on and won't have to ask in the first place!
ooo very true! :thumbsup: :thumbsup:

#### Artosoft

##### Senior Member
Zaknafein said:
ehh i read the link, but i cant figure out where i am wrong at? :dunno:
Ok, let me try to explain in my Singlish :

DoF (Depth of Field) its something like this:
CAMERA ..................................... Dnear...... Dfocus................Dfar.

Hyperfocal when set to Dfocus, anything from Dnear to Dfar (infinity) is in focus.

While your mention only from Dfocus to Dfar (infinity) is in focus .

I hope it is clarify everything.

Regards,
Arto.

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