[nandadevieast]

I have asked something like this before, but this is ever so slightly different <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />



M43 lenses 45 1.8 and 60 2.8 macro.



45 will have shallower DOF (45 divided by 1.8) but 60 can go nearer than 45. Because i can get closer with 60, will it have shallower DOF? I am talking about something like a headshot.



I have never used a macro lens, don't know if focussing is a continuum or there are two separate modes, one for macro and other for general purpose use...



regards,

[edge]

At the same working distance to the subject, I believe the 60mm 2.8 macro will have a shallower DoF than the 45mm 1.8, but of course the 60mm will have a tighter field of view.

[netrex]

I suggest you input the relevant data [url="http://www.dofmaster.com/doftable.html"]here[/url] and see what comes out at the focusing distance you expect to work at.

[Guest]

[quote name='nandadevieast' timestamp='1349534933' post='20519']

I have asked something like this before, but this is ever so slightly different <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />



M43 lenses 45 1.8 and 60 2.8 macro.



45 will have shallower DOF (45 divided by 1.8) but 60 can go nearer than 45. Because i can get closer with 60, will it have shallower DOF? I am talking about something like a headshot.



I have never used a macro lens, don't know if focussing is a continuum or there are two separate modes, one for macro and other for general purpose use...



regards,

[/quote]



In addition to dofmaster, you can use this nice simulator:

http://kingfisher.in.coocan.jp/boke2/bokekeisan2e.html

[nandadevieast]

Hi, DOF master is not helping.

It starts with 1 ft.

DOF is listed as same in case of F2 and F2.8 ???

Let me rephrase my question:



Supposing two lenses of the same focal length: 50 F2 and 50 F2, but one of them is macro lens.

At one feet, the minimum focus distance, the non-macro gives a DOF of X inches.

But since macro can go nearer, the DOF should be shallower than X, right?

Now what happens with the actual lenses being 45/1.8 and 60/2.8 macro...?

can you tell me?

[arvydas]

Hi,

In macro at max. magnification (what usually means MFD) FL doesn't matter - you will get same DOF with any lens (using the same (effective) f stop and the same magnification). Thus for 60mm f2.8 at 0.19m (MFD) and magnification 1:1 DOF will be 0.26mm; for 45mm f1.8 at MFD (50 cm)- 0.6cm (check [url="http://www.cambridgeincolour.com/tutorials/macro-lenses.htm"]here[/url] and [url="http://www.cambridgeincolour.com/tutorials/dof-calculator.htm"]here[/url] <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />).





A.



P.S. to find out magnifications other than MFD, check [url="http://orionmystery.blogspot.com/2010/09/macro-magnification-how-to-calculate.html"]here[/url]



A.

[Brightcolours]

You can not do a headshot at such distances...

[arvydas]

I suppose for head shots magnification will be less than 0.1 (big head - small sensor), and any macro properties of the lens become irrelevant. Olympus only show (on lens barrel) that at distance of 0.34m magnification becomes 0.25; for example Tamron's 60mm or Pentax 100mm macro lenses have magnification of 0.1 at about 1 meter distance.



A.

[nandadevieast]

sorry for the confusion...i have no idea about the macro lenses

thinking of using one of these

[netrex]

Figure out how far away your subjects has to be for you to take the pictures you want, then go back to dofmaster and see if those distances can be seen there.