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Odd focus with 50mm 1.4 on D800

Ajjra

Brooklyn, US
104 posts

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Ajjra Silver Member Nikonian since 25th May 2010
Sun 24-Mar-13 11:16 PM

This shot was was taken at close range at F/1.4. The bench he is sitting on is completely perpendicular to me, but there are circles of confusion right next to him and the ends of the bench appear to be back in focus. Any idea why?

I use this lens all the time at this aperture and haven't seen this before. It's not moire as far as I can tell.

Thanks.



Click on image to view larger version


Attachment#1 (jpg file)

avisys

Placitas, US
482 posts

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#1. "RE: Odd focus with 50mm 1.4 on D800" | In response to Reply # 0

avisys Basic Member
Sun 24-Mar-13 10:46 PM

The 50 1.4 is not known for flat field --- or maybe I should say infamous.

It IS known for great performance in in-focus areas -- for an f1.4 lens. Just don't expect superb ~overall~ IQ at f1.4 --- that's not the reason this lens exists.

Flat field? 105mm or 60mm micro. 50mm f1.8 is quite a bit better than the 1.4. Etc., etc. . . .



AviSys

Ajjra

Brooklyn, US
104 posts

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#2. "RE: Odd focus with 50mm 1.4 on D800" | In response to Reply # 1

Ajjra Silver Member Nikonian since 25th May 2010
Mon 25-Mar-13 09:03 AM

>The 50 1.4 is not known for flat field --- or maybe I should
>say infamous.
>
>It IS known for great performance in in-focus areas -- for an
>f1.4 lens. Just don't expect superb ~overall~ IQ at f1.4 ---
>that's not the reason this lens exists.
>
>Flat field? 105mm or 60mm micro. 50mm f1.8 is quite a bit
>better than the 1.4. Etc., etc. . . .
>
>
>
>


Ahh, that makes sense. Thank you.

ajdooley

Waterloo, US
3375 posts

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#3. "RE: Odd focus with 50mm 1.4 on D800" | In response to Reply # 0

ajdooley Gold Member Nikonian since 25th May 2006
Mon 25-Mar-13 05:37 PM

Wade - I frankly don't think you have a problem here. Any lens at f1.4 has a paper-thin DOF. The young man's eyes appear sharp -- at least as far as I can tell from the low res attachment. I'd not worry about anything except my subject being in focus with the close focus distance and wide aperture. Nice photo -- and positioning him in the left part of the frame lends tension to the photo.

Alan
Waterloo, IL, USA
www.proimagingmidamerica.com

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Clint S

Chula Vista, US
460 posts

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#4. "RE: Odd focus with 50mm 1.4 on D800" | In response to Reply # 0

Clint S Silver Member Nikonian since 02nd Jan 2011
Thu 28-Mar-13 11:39 PM

I used to have a AF 50mm f/1.4 (pre AFD) and while at f/1.4 the center would be focused, a circular area around that would go out of focus, and the next areas were slightly coming back into focus, and then the corners were out of focus again. That’s just the way some fast lenses used be wide open.

Kind of like your photo.

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