Sigma 50mm: Marmite Bokeh

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Archive 2008 · Sigma 50mm: Marmite Bokeh

httivals
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p.2 #1 · Sigma 50mm: Marmite Bokeh

Mark: How accurate is the focusing of the Sigma 50mm f1.4 (or your Sigma 50mm f1.4) on a Canon 5D? Thanks, Howard

Jul 01, 2008 at 05:39 PM

hubsand
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p.2 #2 · Sigma 50mm: Marmite Bokeh

The first time I trialled the Sigma 50's AF on the 1Ds III it was laughable, but I've not had enough time with it to comment on that.

Jul 01, 2008 at 05:50 PM

cogitech
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p.2 #3 · Sigma 50mm: Marmite Bokeh

I prefer the Sigma bokeh. It is all so subjective, I suppose.

Jul 01, 2008 at 06:03 PM

trumpet_guy
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p.2 #4 · Sigma 50mm: Marmite Bokeh

httivals wrote:
Mark: How accurate is the focusing of the Sigma 50mm f1.4 (or your Sigma 50mm f1.4) on a Canon 5D? Thanks, Howard

At dpreview.com, user Chez Wimpy posted extensively about this lens
and mentioned that autofocus worked fine with this lens on his 20D.
A number of the shots he posted from AI Servo mode looked good.

Check here:
http://forums.dpreview.com/forums/read.asp?forum=1029&message=28290959
and here:
http://forums.dpreview.com/forums/read.asp?forum=1029&message=28301575

My copy should arrive today. We'll see how it works on a 30D.

Tim

Edited by trumpet_guy on Jul 01, 2008 at 01:01 PM GMT

Edited on Jul 01, 2008 at 08:01 PM

Jul 01, 2008 at 06:34 PM

Andi Dietrich
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p.2 #5 · Sigma 50mm: Marmite Bokeh

Does the EXIF allow lens corrections in DPP? This may be a possibility if Sigma adapter the same settings of the EF50mm

Jul 01, 2008 at 06:50 PM

Andi Dietrich
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p.2 #6 · Sigma 50mm: Marmite Bokeh

Thanks Mark to share your insight on this lens, sorry I once more have to leave a critical comment about it

These are not bokeh samples, these are OOF blur disc samples, it doesnt tell a lot about the quality of the bokeh, maybe it tells something about the character of the bokeh though. Curvature of field may just be too different to any other lenses to compare them the way you have done it.

I believe that the reason some lenses do not fully correct CA wide open, is that you have shaped OOF discs and not the IMO boring blobs of the Sigma. Again some people may like it others dont and it is certainly a lens with some appeal to people who want to replace the Canon 1.4

Jul 01, 2008 at 06:53 PM

martinsmith
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p.2 #7 · Sigma 50mm: Marmite Bokeh

What's wrong with the bokeh of the Siggy?

Jul 01, 2008 at 06:54 PM

timbop
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p.2 #8 · Sigma 50mm: Marmite Bokeh

cogitech wrote:
I prefer the Sigma bokeh. It is all so subjective, I suppose.

agreed. I suppose it depends on what "look" you are going for, but I like buttery backgrounds

Jul 01, 2008 at 07:57 PM

CKrueger
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p.2 #9 · Sigma 50mm: Marmite Bokeh

It's amusing that for years around here we've heard people complain about the busy bokeh of Canon lenses and rave about the smooth bokeh of other makes of lenses. Now that Sigma seems to have put out a lens with smooth bokeh, some complain that its bokeh is not busy enough.

Perhaps Sigma needs to launch a luxury brand, ala Lexus.

Jul 01, 2008 at 08:44 PM

Andi Dietrich
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p.2 #10 · Sigma 50mm: Marmite Bokeh

CKrueger wrote:
It's amusing that for years around here we've heard people complain about the busy bokeh of Canon lenses and rave about the smooth bokeh of other makes of lenses. Now that Sigma seems to have put out a lens with smooth bokeh, some complain that its bokeh is not busy enough.

Perhaps Sigma needs to launch a luxury brand, ala Lexus.

You missed the point.
we have no idea how the full image looks like, where the focus sits, how much the blobs are out of focus, the distance to the background, the scale of the image

Jul 01, 2008 at 08:58 PM

JohnJ
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p.2 #11 · Sigma 50mm: Marmite Bokeh

I think the sigmas's bokeh looks best.
JJ

Jul 01, 2008 at 10:03 PM

hubsand
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p.2 #12 · Sigma 50mm: Marmite Bokeh

Andi Dietrich wrote:
You missed the point.
we have no idea how the full image looks like, where the focus sits, how much the blobs are out of focus, the distance to the background, the scale of the image.

The point is that all four lenses were placed under identical conditions; the comparative difference is the point.

I'm not sure that posting the full frame will tell you anything more meaningful than the crops, but here it is anyway: the Sigma at f4. Distance to focal plane (subject centre frame) was about 1m. Distance to bokeh samples ranged from about 15cm to 1.5m. As stated previously, all these are background rather than foreground samples.

This image is copyrighted by the owner

I will be looking at the bokeh in other settings but I'm not interested in shooting an unrealistically contrived set: for me, bokeh only becomes an issue when it's either too busy, draws ugly light discs, or has prominent CA – so I'll be seeking out scenes that tell me something I want to know.

If anyone wants to see samples of different areas at different scales or apertures, just shout.

Edited on Jul 01, 2008 at 10:27 PM

Jul 01, 2008 at 10:21 PM

FranchiseJuan
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p.2 #13 · Sigma 50mm: Marmite Bokeh

From what i can see, I am linking this Sigma very much. I am probably going to get one to have a play with, as i have no AF 50 at the moment.

Mark: Have you got a sample as above but at F1.4? Just want to see what it is like.

Jul 01, 2008 at 11:26 PM

hubsand
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p.2 #14 · Sigma 50mm: Marmite Bokeh

FranchiseJuan wrote:
Mark: Have you got a sample as above but at F1.4? Just want to see what it is like.

This image is copyrighted by the owner

Jul 01, 2008 at 11:47 PM

mh2000
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p.2 #15 · Sigma 50mm: Marmite Bokeh

looking very very promising to me! thanks!

Jul 02, 2008 at 12:05 AM

trumpet_guy
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p.2 #16 · Sigma 50mm: Marmite Bokeh

Andi Dietrich wrote:
Does the EXIF allow lens corrections in DPP? This may be a possibility if Sigma adapter the same settings of the EF50mm

I just got my Sigma 50 tonight. Yes, it allows lens corrections in DPP.
I'm not sure how relevant this is, since the geometric distortion is very
well controlled on this lens, and I haven't seen much CA with it.
I also noticed that Peripheral Illumination correction vastly over-corrected
the vignetting, if I used the standard amount (100).

Tim

Jul 02, 2008 at 06:37 AM

trumpet_guy
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p.2 #17 · Sigma 50mm: Marmite Bokeh

I'm posting some shots taken with the Sigma 50/1.4 on a 30D.
Shots processed in DPP with default constrast and sharpness (0 and 3,
respectively) in "Standard" picture style. The white balance was either
"Daylight" or "Shade". These shots were taken in the evening. The light
varies from fairly bright, golden hour light, to shaded and dim.

The resizing was with Photoshop Elements using Bicubic and subsequently
Unsharp Mask (125%, 0.3, 0). Crops are 100% crops from the 8-bit TIFF files
out of DPP, with no further processing in Photoshop.

All shots are wide open, f/1.4, except the last pair, as indicated.

Edited by trumpet_guy on Jul 02, 2008 at 02:44 AM GMT

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