105 or 60

[Doc Harry]

The question is not, "What's the difference in DOF between a 60 and and 105 lens?"

The question is, "What's the difference in DOF between a 90 and and 105 lens?"

According to you chart, at f/32 and 0.5 feet the DOF is as follows:

60mm DOF = 0.49 to 0.51 feet

105mm DOF = 0.50 to 0.50 feet

I assume that DOF differences between 90 and 105mm lenses are nill.

 

[WetLens]

[TABLE="width: 285"]
[TR]
[TD="width: 188, bgcolor: transparent"]Online Depth of Field Calculator


[/TD]
[TD="class: xl72, width: 100, bgcolor: transparent"]90[/TD]
[TD="class: xl72, width: 92, bgcolor: transparent"]105[/TD]
[/TR]
[TR]
[TD="class: xl63, width: 188, bgcolor: #e0edcd"]Subject distance [/TD]
[TD="class: xl64, width: 100, bgcolor: #e0edcd"]12 in[/TD]
[TD="class: xl64, width: 92, bgcolor: #e0edcd"]12 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 288, bgcolor: #e0edcd, colspan: 2"] [/TD]
[TD="class: xl66, width: 92, bgcolor: #e0edcd"] [/TD]
[/TR]
[TR]
[TD="class: xl67, width: 288, bgcolor: #e0edcd, colspan: 2"]Depth of field [/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"] [/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Near limit [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]11.9 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]11.9 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Far limit [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]12.1 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]12.1 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Total [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]0.2 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]0.14 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 288, bgcolor: #e0edcd, colspan: 2"] [/TD]
[TD="class: xl66, width: 92, bgcolor: #e0edcd"] [/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]In front of subject [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]0.1 in (50%)[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]0.07 in (50%)[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Behind subject [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]0.1 in (50%)[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]0.07 in (50%)[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 288, bgcolor: #e0edcd, colspan: 2"] [/TD]
[TD="class: xl66, width: 92, bgcolor: #e0edcd"] [/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Hyperfocal distance [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]1000.1 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]1360.6 in[/TD]
[/TR]
[TR]
[TD="class: xl69, width: 188, bgcolor: #e0edcd"]Circle of confusion [/TD]
[TD="class: xl70, width: 100, bgcolor: #e0edcd"]0.02 mm[/TD]
[TD="class: xl71, bgcolor: #e0edcd"]0.02 mm[/TD]
[/TR]
[/TABLE]

 

[Meyr]

[TABLE="width: 285"]
[TR]
[TD="width: 188, bgcolor: transparent"]Online Depth of Field Calculator

[/TD]
[TD="class: xl72, width: 100, bgcolor: transparent"]90[/TD]
[TD="class: xl72, width: 92, bgcolor: transparent"]105[/TD]
[/TR]
[TR]
[TD="class: xl63, width: 188, bgcolor: #e0edcd"]Subject distance [/TD]
[TD="class: xl64, width: 100, bgcolor: #e0edcd"]12 in[/TD]
[TD="class: xl64, width: 92, bgcolor: #e0edcd"]12 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 288, bgcolor: #e0edcd, colspan: 2"][/TD]
[TD="class: xl66, width: 92, bgcolor: #e0edcd"][/TD]
[/TR]
[TR]
[TD="class: xl67, width: 288, bgcolor: #e0edcd, colspan: 2"]Depth of field [/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"][/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Near limit [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]11.9 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]11.9 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Far limit [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]12.1 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]12.1 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Total [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]0.2 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]0.14 in[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 288, bgcolor: #e0edcd, colspan: 2"][/TD]
[TD="class: xl66, width: 92, bgcolor: #e0edcd"][/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]In front of subject [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]0.1 in (50%)[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]0.07 in (50%)[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Behind subject [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]0.1 in (50%)[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]0.07 in (50%)[/TD]
[/TR]
[TR]
[TD="class: xl65, width: 288, bgcolor: #e0edcd, colspan: 2"][/TD]
[TD="class: xl66, width: 92, bgcolor: #e0edcd"][/TD]
[/TR]
[TR]
[TD="class: xl65, width: 188, bgcolor: #e0edcd"]Hyperfocal distance [/TD]
[TD="class: xl68, width: 100, bgcolor: #e0edcd"]1000.1 in[/TD]
[TD="class: xl68, width: 92, bgcolor: #e0edcd"]1360.6 in[/TD]
[/TR]
[TR]
[TD="class: xl69, width: 188, bgcolor: #e0edcd"]Circle of confusion [/TD]
[TD="class: xl70, width: 100, bgcolor: #e0edcd"]0.02 mm[/TD]
[TD="class: xl71, bgcolor: #e0edcd"]0.02 mm[/TD]
[/TR]
[/TABLE]

so what does the numbers mean?

 

[WetLens]

Not much. Question was asked; answer provided. Bottom line is that there is a trade-off between lenses and understanding those trade-offs and what you want to accomplish should guide your lens decision. Want more DOF, choose a shorter focal length lens and/or close the aperture; want less DOF, choose a longer focal length lens and/or open the aperture. If DOF isn't the concern, decide what is - understand the differences between lenses and choose appropriately. There is not one answer to the question, "Which lens?"