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Circle of Confusion calculation

 
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mfrissen



Joined: 10 Jun 2004
Posts: 25
Location: Netherlands

PostPosted: Mon Dec 06, 2004 1:25 pm    Post subject: Reply with quote

Hi,

I'm contemplating a RH-10 back for my CG45. I'm using an excel sheet to calculate/print the DOF for different ranges. However, I'm always confused with the following:
- if I use a RH-10 back, which is in effect a 6x7 format, should I use the 6x7 CoC (0.06mm) or keep using the 4x5 CoC (0.1mm) to calculate the DOF?

since the distance to film doesn't change.. I think the latter.. but as I said.. I'm always confused with this "CoC" thing (hence the name probably...)
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Dan Fromm



Joined: 14 May 2001
Posts: 1885
Location: New Jersey

PostPosted: Mon Dec 06, 2004 2:58 pm    Post subject: Reply with quote

Quote:

On 2004-12-06 05:25, mfrissen wrote:
Hi,

I'm contemplating a RH-10 back for my CG45. I'm using an excel sheet to calculate/print the DOF for different ranges. However, I'm always confused with the following:
- if I use a RH-10 back, which is in effect a 6x7 format, should I use the 6x7 CoC (0.06mm) or keep using the 4x5 CoC (0.1mm) to calculate the DOF?

since the distance to film doesn't change.. I think the latter.. but as I said.. I'm always confused with this "CoC" thing (hence the name probably...)
Use the 6x7 CoC because you'll enlarge 6x7 more than 4x5 to get the same final print size.
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glennfromwy



Joined: 29 Nov 2001
Posts: 903
Location: S.W. Wyoming

PostPosted: Mon Dec 06, 2004 8:24 pm    Post subject: Reply with quote

Yep, circle of confusion. That's me.

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Glenn

"Wyoming - Where everybody is somebody else's weirdo"
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