DOFMaster iPhone App Question - Nikon: When using DOF Master for the iPhone, you select a format (camera). For Nikon DSLRs there are only two selections; Nikon DSLR and Nikon D3. The...

smith934 Loc: Huntsville, Alabama

When using DOF Master for the iPhone, you select a format (camera). For Nikon DSLRs there are only two selections; Nikon DSLR and Nikon D3. The question is, which do I chose when using a D800? D7100?

Toggling between the two selections does make a difference in the calculation because it relies on the COC to calculate. Do the D800 & the D3 sensors have the same COC?

Also, is the entry for the "Focus" field, the actual distance to the subject, whereas the resultant Hyperfocal distance is the point one should focus on?

Like most apps DOF Master is short on instructions.

warrior Loc: Paso Robles CA

What does http://www.nikonusa.com say?

smith934 Loc: Huntsville, Alabama

warrior wrote:

What does http://www.nikonusa.com say?

Thanks for the suggestion. Nikon says for a FX sensor use .033 and DOF Master allows for a COC input in lieu of a specific camera. They (Nikon) give an example of using .033, f8 yielding a hyperfocal distance (HD) of approximately 31'. Using those same inputs in DOF Master, the HD is also approximately 31' giving a DOF of 15.6' (half of HD) to 4125'.

So it appears that using the app, it has to calculate HD and then the user has to go back and enter the HD in the "Focus" field to then get the near and far limits of DOF.

Again thanks for setting me on the right path

:thumbup:

mcveed Loc: Kelowna, British Columbia (between trips)

smith934 wrote:

Thanks for the suggestion. Nikon says for a FX se... (show quote)

That's the way DOFMaster works with the PC version too. The HFD is dependent only on the sensor size, focal length and the aperture. It is independent of focus distance. Once you have the HFD you don't really need to go back and input the HFD as your focus distance to get the DOF - the DOF will always be from one half of the HFD to infinity.

smith934 Loc: Huntsville, Alabama

mcveed wrote:

That's the way DOFMaster works with the PC version too. The HFD is dependent only on the sensor size, focal length and the aperture. It is independent of focus distance. Once you have the HFD you don't really need to go back and input the HFD as your focus distance to get the DOF - the DOF will always be from one half of the HFD to infinity.

Yeah, in that part of the app, what was throwing me off was the "focus" field. Would have been much simpler and easier to understand the app if they had either left it off completely, or had it read into that field automatically

BHC Loc: Strawberry Valley, JF, USA

Several DOF calculators have an extensive list of cameras from which to choose. The only difference in the listings and calculations is CoC - and that is dependent on "crop factor. Use whatever listing matches your sensor size; it can be anywhere form .010 - .050.

smith934 Loc: Huntsville, Alabama

Mogul wrote:

Several DOF calculators have an extensive list of cameras from which to choose. The only difference in the listings and calculations is CoC - and that is dependent on "crop factor. Use whatever listing matches your sensor size; it can be anywhere form .010 - .050.

Thanks. As warrior suggested, I searched on the Nikon site and found they use .033 and .020 CoC, for FX & DX sensors respectively. The DOF app allows you to pick CoC numbers to use in lieu of a specific camera. Interestingly enough, the DoF Master web site, lists more cameras than the app.

I do have several DOF type apps, but DOF Master seems easier to ken, and their results are much more consistent with the actual calculations.