If you use the 20/1.7 you will need to be about 3.5 feet from the
subject for an upper body shot. At 3.5 feet and f/1.7 the depth of
field is from 3.3 to 3.8 feet. You will have to place the focus point
well in front of the hand and ring if you want to effect a rapid
roll-off. You might want to reconsider the use of such a short focal
length since it puts you very close to the subject.
A 50/1.8 would allow you to back off to about 7 feet and have depth of
field from 6.8 to 7.2 feet. Shallower depth of field with more working
room. Probably more normal perspective as well. Dig out the old OM Zuiko.
Chuck Norcutt
On 10/21/2015 1:03 AM, Paul Braun wrote:
This weekend I'm going to try and get a photo of a well-known someone at
an event, but I have a specific shot in mind.
The person wears a very special ring, and I want the portrait to make
the ring the main subject. I'm thinking of having him seated, elbows on
a table, forearms up and hands crossed over each other, with the ring
finger on top. However, I still want his face in the photo, but the
point of focus is the hands/ring, with the face somewhat out of focus,
just enough to tell who he is and to add some context to the ring.
I'm thinking I need a wide aperture to get the necessary DoF control,
which leaves me with the Panny 20/1.7 or toughing it out old-school with
the OM 50/1.2 on the adapter.
I am going to try and experiment tomorrow if I have time, but meanwhile
I look towards the collective wisdom.
Oh - this shot may or may not be with flash - depending on what room I
get to use. If flash, will probably be the FL-600r with the Fong salad
bowl on a bracket, set for fill.
--
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