How Hard could it Be to Add Depth of Field Info?

Started Jan 20, 2013 | Discussions
AEP2 Forum Member • Posts: 80
How Hard could it Be to Add Depth of Field Info?
1

If an iphone ap can do it, certainly the 5D3 should as well.  Camera knows focusing distance, lens aperture, and zoom value.  The depth of field button is pretty useless.  Give the info as 25-75, for example.

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schmegg Veteran Member • Posts: 5,768
Re: How Hard could it Be to Add Depth of Field Info?

AEP2 wrote:

If an iphone ap can do it, certainly the 5D3 should as well. Camera knows focusing distance, lens aperture, and zoom value. The depth of field button is pretty useless. Give the info as 25-75, for example.

Not sure the camera always knows the focusing distance though. It's my understanding that older lenses don't report this (and I don't know about third party lenses either) so the feature would not always work. That's as far as I know - I could be wrong.

Lemming51
Lemming51 Forum Pro • Posts: 14,753
Re: How Hard could it Be to Add Depth of Field Info?

AEP2 wrote:

If an iphone ap can do it, certainly the 5D3 should as well. Camera knows focusing distance, lens aperture, and zoom value. The depth of field button is pretty useless. Give the info as 25-75, for example.

It is easy to add, but such a display implies greater precision than exists.

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Nigel Wilkins
Nigel Wilkins Senior Member • Posts: 1,006
Re: How Hard could it Be to Add Depth of Field Info?

AEP2 wrote:

If an iphone ap can do it, certainly the 5D3 should as well. Camera knows focusing distance, lens aperture, and zoom value. The depth of field button is pretty useless. Give the info as 25-75, for example.

It is easy to add,it used to be on most lenses.  I use one with depth of field scales.

The problem is, it's of limited use.  The camera doesn't know what you consider to be in or out of focus or how big you're going to print the image or from how far you intend to view it.  It's not an exact science.  How accurate is your iPhone app?

Personally, I find with live view, the depth of field button to be more useful than any theoretical limits.

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rrccad Forum Pro • Posts: 10,912
Re: How Hard could it Be to Add Depth of Field Info?

AEP2 wrote:

If an iphone ap can do it, certainly the 5D3 should as well. Camera knows focusing distance, lens aperture, and zoom value. The depth of field button is pretty useless. Give the info as 25-75, for example.

what's your observer distance and final image magnification?

DoF is varied and not exactly accurate to calculate at the time of the image being captured.  the most accurate calc would be on a 2lp calculation for DoF .. which would have some horrified to see how small it is.

if you use the standard DoF .. it's not realistic .. since that was based upon an observer distance of around 2 feet (I think .. ) and a print output of 12x8.

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