Interesting DOF non-scientific test

Joined
Aug 12, 2005
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1,547
Location
Famington Hills, MI
Well I just picked up a 50mm 1.4 lens earlier this week. As I was playing with it I ended up taking a few shots out of my car window pointed at the mirror. I shot a series at f stops, 1.4, 2.0, 2.8, 4, 8, and 16. I thought how the DOF and bokeh interacted were really interesting. I also noticed how sharp the background was at all f stops.

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Joined
Apr 15, 2007
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594
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Seattle
Looks like the lens was focused around infinity, so what you see is what you should expect. If, instead, you focused on the edge of the mirror, then you'd have a different blur series.
 
Joined
Aug 12, 2005
Messages
1,547
Location
Famington Hills, MI
Would it be? To be in focus wouldn't it need to be focused at the approximately 3 foot distance between the camera lens and mirror? I'll have to check next time.
 
Joined
Mar 5, 2006
Messages
519
Location
Taipei, Taiwan
No, it is not focused on the mirror, it is focused on the object the mirror is reflecting, which appears to be quite a bit more than 1 meter.

Notice how out-of-focus the frame of the mirror is, and how much "clearer" it is at f/8. You're clearly not focused on the mirror itself.
 
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