December 15, 2017, 03:05:23 PM

Author Topic: Mirror box bokeh clipping haunts my dreams  (Read 3424 times)

bereninga

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Re: Mirror box bokeh clipping haunts my dreams
« Reply #30 on: December 04, 2017, 02:43:28 PM »

Now that this blasted forum I love has told me what mirror box bokeh clipping is, I can't *not* see it in portraits.

https://petapixel.com/2017/12/01/shooting-portraits-christmas-lights-ordinary-bedroom/

IT'S EVERYWHERE!  (85 f/1.2L II I believe for these shots)

- A

LMAO! Seriously. I kind of wish I can unread the thread that mentioned the bokeh ball clipping concept.

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Re: Mirror box bokeh clipping haunts my dreams
« Reply #30 on: December 04, 2017, 02:43:28 PM »

jd7

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Re: Mirror box bokeh clipping haunts my dreams
« Reply #31 on: December 04, 2017, 07:18:39 PM »
My understanding is that the Sigma Art 85mm f/1.4 has perfectly round bokeh balls wide open, with no mirror box clipping.  If that is true, is it due to the large front element (86mm)?

Your understanding is incorrect.  For example, see the set of Flickr images posted by jd7, which are with the Sigma 85A.  A couple of images from that set are highlighted below.

I think all of those images were actually taken with the older Sigma 85 1.4 EX rather than the Art ... although I do not expect there would be much difference in terms of bokeh clipping.

bholliman - perhaps the comments you have seen about round bokeh balls are about the ability of the lens to produce "perfectly" round bokeh balls if located near the centre of the frame?  I would expect all of the higher end 85s (at least) to be able to do that.  I believe the clipping occurs as you get closer to the edge of the frame. See the images Neuro posted in this thread http://www.canonrumors.com/forum/index.php?topic=33939.0
6D | 24-70 4L IS | 70-200 2.8L IS II | Sigma 35 1.4 Art | Sigma 50 1.4 Art | Sigma 85 1.4 EX | 1.4x mk II

ahsanford

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Re: Mirror box bokeh clipping haunts my dreams
« Reply #32 on: December 04, 2017, 08:37:12 PM »
bholliman - perhaps the comments you have seen about round bokeh balls are about the ability of the lens to produce "perfectly" round bokeh balls if located near the centre of the frame?  I would expect all of the higher end 85s (at least) to be able to do that.  I believe the clipping occurs as you get closer to the edge of the frame. See the images Neuro posted in this thread http://www.canonrumors.com/forum/index.php?topic=33939.0

I guess both 85L lenses aren't 'higher end' then:

http://www.canonrumors.com/forum/index.php?topic=33869.msg696463#msg696463

Lovely shot, btw, but the clipping is clearly present.  And as best I can tell, it's not a corner or central issue, but somewhere in between.  That shot shows cat eye bokeh up top (fine by me) and some lovely central circles, but the sides in particular have the bokeh clipped pretty hard.  The bokeh sadly becomes a distraction when this happens.  No knock on the photographer in this case -- it's a great shot that the lens couldn't fully realize, I guess.

- A

bholliman

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Re: Mirror box bokeh clipping haunts my dreams
« Reply #33 on: December 04, 2017, 08:46:49 PM »
My understanding is that the Sigma Art 85mm f/1.4 has perfectly round bokeh balls wide open, with no mirror box clipping.  If that is true, is it due to the large front element (86mm)?

Your understanding is incorrect.  For example, see the set of Flickr images posted by jd7, which are with the Sigma 85A.  A couple of images from that set are highlighted below.

Thanks for setting the record straight.  That's what I get for speed reading the 85mm f/1.4 IS threads.
5DsR, EF Lenses: 35mm f/2IS, 300mm f/2.8L II IS, 16-35mm f/4L IS, 24-70mm f/2.8LII, 70-200mm f/2.8LIS II, 100-400mm II
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https://www.flickr.com/photos/68928679@N05

jd7

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Re: Mirror box bokeh clipping haunts my dreams
« Reply #34 on: December 04, 2017, 09:06:43 PM »
bholliman - perhaps the comments you have seen about round bokeh balls are about the ability of the lens to produce "perfectly" round bokeh balls if located near the centre of the frame?  I would expect all of the higher end 85s (at least) to be able to do that.  I believe the clipping occurs as you get closer to the edge of the frame. See the images Neuro posted in this thread http://www.canonrumors.com/forum/index.php?topic=33939.0

I guess both 85L lenses aren't 'higher end' then:

http://www.canonrumors.com/forum/index.php?topic=33869.msg696463#msg696463

Lovely shot, btw, but the clipping is clearly present.  And as best I can tell, it's not a corner or central issue, but somewhere in between.  That shot shows cat eye bokeh up top (fine by me) and some lovely central circles, but the sides in particular have the bokeh clipped pretty hard.  The bokeh sadly becomes a distraction when this happens.  No knock on the photographer in this case -- it's a great shot that the lens couldn't fully realize, I guess.

- A

I take your point, although it does seem the bokeh circles which are very close to the centre are round ... it's just that you don't have to get very far at all from the centre before you see significant clipping. It seems to me that compared to the Canon 85Ls, the older Sigma 85 EX (and the newer Art?) is showing clipping in a smaller area of the frame, primarily near the top ... or am I imagining it? Anyway, I don't mean to suggest the Canon 85Ls are not high end, regardless of bokeh clipping!
6D | 24-70 4L IS | 70-200 2.8L IS II | Sigma 35 1.4 Art | Sigma 50 1.4 Art | Sigma 85 1.4 EX | 1.4x mk II

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Re: Mirror box bokeh clipping haunts my dreams
« Reply #34 on: December 04, 2017, 09:06:43 PM »